From cbdaa48705855169827f29014efbaa934d212ccf Mon Sep 17 00:00:00 2001
From: Arne Schwabe <arne@rfc2549.org>
Date: Tue, 12 Nov 2019 22:58:14 +0100
Subject: Convert most fragments/activities to androidx

---
 main/src/main/res/layout/import_as_config.xml      |   62 +
 main/src/main/res/values-night-v21/styles.xml      |   27 -
 main/src/main/res/values-v21/styles.xml            |   31 -
 main/src/main/res/values/strings.xml               |    2 +
 main/src/main/res/values/styles.xml                |   44 +-
 .../support/v4n/app/FragmentStatePagerAdapter.java |  232 --
 .../android/support/v4n/view/PagerAdapter.java     |  320 ---
 .../java/android/support/v4n/view/ViewPager.java   | 2896 --------------------
 .../de/blinkt/openvpn/activities/BaseActivity.java |   15 +-
 .../blinkt/openvpn/activities/ConfigConverter.kt   |    8 +-
 .../de/blinkt/openvpn/activities/LogWindow.java    |    2 +-
 .../de/blinkt/openvpn/activities/MainActivity.java |   28 +-
 .../blinkt/openvpn/activities/VPNPreferences.java  |   56 +-
 .../de/blinkt/openvpn/fragments/AboutFragment.java |    7 +-
 .../de/blinkt/openvpn/fragments/FaqFragment.java   |    5 +-
 .../blinkt/openvpn/fragments/GeneralSettings.java  |  208 +-
 .../de/blinkt/openvpn/fragments/GraphFragment.java |   13 +-
 .../openvpn/fragments/KeyChainSettingsFragment.kt  |   20 +-
 .../de/blinkt/openvpn/fragments/LogFragment.java   |   39 +-
 .../fragments/OpenVpnPreferencesFragment.java      |    6 +-
 .../blinkt/openvpn/fragments/SendDumpFragment.java |  184 +-
 .../openvpn/fragments/Settings_Allowed_Apps.kt     |   24 +-
 .../openvpn/fragments/Settings_Authentication.java |  300 +-
 .../openvpn/fragments/Settings_Fragment.java       |    3 +-
 .../de/blinkt/openvpn/fragments/Settings_IP.java   |   40 +-
 .../blinkt/openvpn/fragments/Settings_Obscure.java |   18 +-
 .../blinkt/openvpn/fragments/Settings_Routing.java |   34 +-
 .../openvpn/fragments/ShowConfigFragment.java      |   24 +-
 .../blinkt/openvpn/fragments/VPNProfileList.java   |   12 +-
 .../openvpn/views/DefaultVPNListPreference.java    |    4 +-
 .../blinkt/openvpn/views/PagerSlidingTabStrip.java |  732 -----
 .../blinkt/openvpn/views/RemoteCNPreference.java   |  172 +-
 .../openvpn/views/RemoteCNPreferenceDialog.java    |  124 +
 .../openvpn/views/ScreenSlidePagerAdapter.java     |   11 +-
 .../de/blinkt/openvpn/views/SlidingTabLayout.java  |  314 ---
 .../de/blinkt/openvpn/views/SlidingTabStrip.java   |  207 --
 .../java/de/blinkt/openvpn/views/TabBarView.java   |   16 -
 main/src/ui/res/layout-v21/tabs.xml                |    3 +-
 main/src/ui/res/layout/main_activity.xml           |   17 +-
 main/src/ui/res/layout/padersliding_tab.xml        |   13 -
 main/src/ui/res/layout/sliding_tab.xml             |   13 +
 main/src/ui/res/layout/tabs.xml                    |   12 -
 main/src/ui/res/layout/tlsremote.xml               |   10 +-
 main/src/ui/res/values-v21/colours.xml             |    9 -
 44 files changed, 825 insertions(+), 5492 deletions(-)
 create mode 100644 main/src/main/res/layout/import_as_config.xml
 delete mode 100644 main/src/main/res/values-night-v21/styles.xml
 delete mode 100644 main/src/main/res/values-v21/styles.xml
 delete mode 100644 main/src/ui/java/android/support/v4n/app/FragmentStatePagerAdapter.java
 delete mode 100644 main/src/ui/java/android/support/v4n/view/PagerAdapter.java
 delete mode 100644 main/src/ui/java/android/support/v4n/view/ViewPager.java
 delete mode 100644 main/src/ui/java/de/blinkt/openvpn/views/PagerSlidingTabStrip.java
 create mode 100644 main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreferenceDialog.java
 delete mode 100644 main/src/ui/java/de/blinkt/openvpn/views/SlidingTabLayout.java
 delete mode 100644 main/src/ui/java/de/blinkt/openvpn/views/SlidingTabStrip.java
 delete mode 100644 main/src/ui/java/de/blinkt/openvpn/views/TabBarView.java
 delete mode 100644 main/src/ui/res/layout/padersliding_tab.xml
 create mode 100644 main/src/ui/res/layout/sliding_tab.xml
 delete mode 100644 main/src/ui/res/layout/tabs.xml
 delete mode 100644 main/src/ui/res/values-v21/colours.xml

(limited to 'main/src')

diff --git a/main/src/main/res/layout/import_as_config.xml b/main/src/main/res/layout/import_as_config.xml
new file mode 100644
index 00000000..27ef3de3
--- /dev/null
+++ b/main/src/main/res/layout/import_as_config.xml
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) 2012-2016 Arne Schwabe
+  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
+  -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <EditText
+        android:id="@+id/as_servername"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="4dp"
+        android:layout_marginTop="4dp"
+        android:layout_marginRight="4dp"
+        android:layout_marginBottom="4dp"
+        android:hint="@string/as_servername"
+        android:inputType="textPassword" />
+
+    <EditText
+        android:id="@+id/username"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="4dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginRight="4dp"
+        android:layout_marginBottom="4dp"
+        android:hint="@string/auth_username"
+        android:inputType="textEmailAddress" />
+
+    <EditText
+        android:id="@+id/password"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="4dp"
+        android:layout_marginTop="4dp"
+        android:layout_marginRight="4dp"
+        android:layout_marginBottom="4dp"
+        android:hint="@string/password"
+        android:inputType="textPassword" />
+
+    <CheckBox
+        android:id="@+id/request_autologin"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginLeft="4dp"
+        android:layout_marginTop="4dp"
+        android:layout_marginRight="4dp"
+        android:layout_marginBottom="16dp"
+        android:text="@string/request_autologin" />
+
+
+    <Button
+        android:id="@+id/import_config"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/import_config" />
+</LinearLayout>
\ No newline at end of file
diff --git a/main/src/main/res/values-night-v21/styles.xml b/main/src/main/res/values-night-v21/styles.xml
deleted file mode 100644
index 24d530fe..00000000
--- a/main/src/main/res/values-night-v21/styles.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (c) 2012-2019 Arne Schwabe
-  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
-  -->
-
-<resources>
-    <style name="blinkt.baseTheme" parent="android:Theme.Material">
-        <item name="android:colorPrimary">@color/primary</item>
-        <item name="android:colorPrimaryDark">@color/primary_dark</item>
-        <item name="android:colorAccent">@color/accent</item>
-        <item name="android:alertDialogTheme">@style/blinkt.alertDialog</item>
-    </style>
-
-    <style name="blinkt.dialog" parent="android:Theme.Material.Dialog">
-        <item name="android:colorPrimary">@color/primary</item>
-        <item name="android:colorPrimaryDark">@color/primary_dark</item>
-        <item name="android:colorAccent">@color/accent</item>
-        <item name="android:alertDialogTheme">@style/blinkt.alertDialog</item>
-    </style>
-
-    <style name="blinkt.alertDialog" parent="android:Theme.Material.Dialog.Alert">
-        <item name="android:colorPrimary">@color/primary</item>
-        <item name="android:colorPrimaryDark">@color/primary_dark</item>
-        <item name="android:colorAccent">@color/accent</item>
-    </style>
-</resources>
\ No newline at end of file
diff --git a/main/src/main/res/values-v21/styles.xml b/main/src/main/res/values-v21/styles.xml
deleted file mode 100644
index e422fdb5..00000000
--- a/main/src/main/res/values-v21/styles.xml
+++ /dev/null
@@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (c) 2012-2016 Arne Schwabe
-  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
-  -->
-
-<resources>
-    <!-- http://www.google.de/design/spec/style/color.html#color-color-palette -->
-    <style name="blinkt.baseTheme" parent="android:Theme.Material.Light.DarkActionBar">
-        <item name="android:colorPrimary">@color/primary</item>
-        <item name="android:colorPrimaryDark">@color/primary_dark</item>
-        <item name="android:colorAccent">@color/accent</item>
-        <item name="android:alertDialogTheme">@style/blinkt.alertDialog</item>
-    </style>
-
-    <style name="blinkt.dialog" parent="android:Theme.Material.Light.Dialog">
-        <item name="android:colorPrimary">@color/primary</item>
-        <item name="android:colorPrimaryDark">@color/primary_dark</item>
-        <item name="android:colorAccent">@color/accent</item>
-        <item name="android:alertDialogTheme">@style/blinkt.alertDialog</item>
-    </style>
-
-    <style name="blinkt.alertDialog" parent="android:Theme.Material.Light.Dialog.Alert">
-        <item name="android:colorPrimary">@color/primary</item>
-        <item name="android:colorPrimaryDark">@color/primary_dark</item>
-        <item name="android:colorAccent">@color/accent</item>
-    </style>
-
-    <style name="Theme.CreateShortCut" parent="android:Theme.Material.DialogWhenLarge" />
-
-</resources>
diff --git a/main/src/main/res/values/strings.xml b/main/src/main/res/values/strings.xml
index 140df4ba..fb0c1936 100755
--- a/main/src/main/res/values/strings.xml
+++ b/main/src/main/res/values/strings.xml
@@ -493,5 +493,7 @@
     <string name="summary_block_address_families">This option instructs Android to not allow protocols (IPv4/IPv6) if the VPN does not set any IPv4 or IPv6 addresses.</string>
     <string name="title_block_address_families">Block IPv6 (or IPv4) if not used by the VPN</string>
     <string name="install_keychain">Install new certificate</string>
+    <string name="as_servername">AS servername</string>
+    <string name="request_autologin">Request autologin profile</string>
 
 </resources>
diff --git a/main/src/main/res/values/styles.xml b/main/src/main/res/values/styles.xml
index 4cdf2c00..f90da367 100644
--- a/main/src/main/res/values/styles.xml
+++ b/main/src/main/res/values/styles.xml
@@ -1,14 +1,33 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
+<?xml version="1.0" encoding="utf-8"?><!--
   ~ Copyright (c) 2012-2016 Arne Schwabe
   ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
   -->
 
 <resources>
-    <style name="blinkt.baseTheme" parent="android:Theme.DeviceDefault.Light" />
+
+    <style name="blinkt.baseTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryDark">@color/primary_dark</item>
+        <item name="colorAccent">@color/accent</item>
+        <item name="alertDialogTheme">@style/blinkt.alertDialog</item>
+    </style>
+
+    <style name="blinkt.dialog" parent="Theme.AppCompat.DayNight.Dialog">
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryDark">@color/primary_dark</item>
+        <item name="colorAccent">@color/accent</item>
+        <item name="alertDialogTheme">@style/blinkt.alertDialog</item>
+    </style>
+
+    <style name="blinkt.alertDialog" parent="Theme.AppCompat.DayNight.Dialog.Alert">
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryDark">@color/primary_dark</item>
+        <item name="colorAccent">@color/accent</item>
+    </style>
+
+
     <style name="blinkt" parent="blinkt.baseTheme" />
 
-    <style name="blinkt.dialog" parent="android:Theme.DeviceDefault.Light.Dialog" />
 
     <style name="item">
         <item name="android:layout_width">match_parent</item>
@@ -59,4 +78,21 @@
         <item name="android:windowFullscreen">true</item>
         <item name="android:windowContentOverlay">@null</item>
     </style>
+
+    <style name="AppTabLayout" parent="Widget.Design.TabLayout">
+        <item name="tabIndicatorColor">?attr/colorAccent</item>
+        <item name="tabIndicatorHeight">4dp</item>
+        <item name="tabPaddingStart">2dp</item>
+        <item name="tabPaddingEnd">2dp</item>
+
+        <item name="tabBackground">@color/primary</item>
+        <item name="tabTextAppearance">@style/AppTabTextAppearance</item>
+        <item name="tabSelectedTextColor">@android:color/white</item>
+    </style>
+
+    <!-- for text -->
+    <style name="AppTabTextAppearance" parent="TextAppearance.Design.Tab">
+        <item name="textAllCaps">true</item>
+    </style>
+
 </resources>
\ No newline at end of file
diff --git a/main/src/ui/java/android/support/v4n/app/FragmentStatePagerAdapter.java b/main/src/ui/java/android/support/v4n/app/FragmentStatePagerAdapter.java
deleted file mode 100644
index 98093854..00000000
--- a/main/src/ui/java/android/support/v4n/app/FragmentStatePagerAdapter.java
+++ /dev/null
@@ -1,232 +0,0 @@
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v4n.app;
-
-import java.util.ArrayList;
-
-import android.annotation.TargetApi;
-import android.app.Fragment;
-import android.app.FragmentManager;
-import android.app.FragmentTransaction;
-import android.os.Build;
-import android.os.Bundle;
-import android.os.Parcelable;
-import android.support.v4n.view.PagerAdapter;
-import android.util.Log;
-import android.view.View;
-import android.view.ViewGroup;
-
-/**
- * Implementation of {@link androidx.viewpager.widget.PagerAdapter} that
- * uses a {@link Fragment} to manage each page. This class also handles
- * saving and restoring of fragment's state.
- *
- * <p>This version of the pager is more useful when there are a large number
- * of pages, working more like a list view.  When pages are not visible to
- * the user, their entire fragment may be destroyed, only keeping the saved
- * state of that fragment.  This allows the pager to hold on to much less
- * memory associated with each visited page as compared to
- * {@link FragmentPagerAdapter} at the cost of potentially more overhead when
- * switching between pages.
- *
- * <p>When using FragmentPagerAdapter the host ViewPager must have a
- * valid ID set.</p>
- *
- * <p>Subclasses only need to implement {@link #getItem(int)}
- * and {@link #getCount()} to have a working adapter.
- *
- * <p>Here is an example implementation of a pager containing fragments of
- * lists:
- *
- * {@sample development/samples/Support13Demos/src/com/example/android/supportv13/app/FragmentStatePagerSupport.java
- *      complete}
- *
- * <p>The <code>R.layout.fragment_pager</code> resource of the top-level fragment is:
- *
- * {@sample development/samples/Support13Demos/res/layout/fragment_pager.xml
- *      complete}
- *
- * <p>The <code>R.layout.fragment_pager_list</code> resource containing each
- * individual fragment's layout is:
- *
- * {@sample development/samples/Support13Demos/res/layout/fragment_pager_list.xml
- *      complete}
- */
-public abstract class FragmentStatePagerAdapter extends PagerAdapter {
-    private static final String TAG = "FragmentStatePagerAdptr";
-    private static final boolean DEBUG = false;
-
-    private final FragmentManager mFragmentManager;
-    private FragmentTransaction mCurTransaction = null;
-
-    private ArrayList<Fragment.SavedState> mSavedState = new ArrayList<Fragment.SavedState>();
-    private ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
-    private Fragment mCurrentPrimaryItem = null;
-
-    public FragmentStatePagerAdapter(FragmentManager fm) {
-        mFragmentManager = fm;
-    }
-
-    /**
-     * Return the Fragment associated with a specified position.
-     */
-    public abstract Fragment getItem(int position);
-
-    @Override
-    public void startUpdate(ViewGroup container) {
-    }
-
-    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
-    @Override
-    public Object instantiateItem(ViewGroup container, int position) {
-        // If we already have this item instantiated, there is nothing
-        // to do.  This can happen when we are restoring the entire pager
-        // from its saved state, where the fragment manager has already
-        // taken care of restoring the fragments we previously had instantiated.
-        if (mFragments.size() > position) {
-            Fragment f = mFragments.get(position);
-            if (f != null) {
-                return f;
-            }
-        }
-
-        if (mCurTransaction == null) {
-            mCurTransaction = mFragmentManager.beginTransaction();
-        }
-
-        Fragment fragment = getItem(position);
-        if (DEBUG) Log.v(TAG, "Adding item #" + position + ": f=" + fragment);
-        if (mSavedState.size() > position) {
-            Fragment.SavedState fss = mSavedState.get(position);
-            if (fss != null) {
-                fragment.setInitialSavedState(fss);
-            }
-        }
-        while (mFragments.size() <= position) {
-            mFragments.add(null);
-        }
-        fragment.setMenuVisibility(false);
-        fragment.setUserVisibleHint(false);
-        mFragments.set(position, fragment);
-        mCurTransaction.add(container.getId(), fragment);
-
-        return fragment;
-    }
-
-    @Override
-    public void destroyItem(ViewGroup container, int position, Object object) {
-        Fragment fragment = (Fragment)object;
-
-        if (mCurTransaction == null) {
-            mCurTransaction = mFragmentManager.beginTransaction();
-        }
-        if (DEBUG) Log.v(TAG, "Removing item #" + position + ": f=" + object
-                + " v=" + ((Fragment)object).getView());
-        while (mSavedState.size() <= position) {
-            mSavedState.add(null);
-        }
-        mSavedState.set(position, mFragmentManager.saveFragmentInstanceState(fragment));
-        mFragments.set(position, null);
-
-        mCurTransaction.remove(fragment);
-    }
-
-    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
-    @Override
-    public void setPrimaryItem(ViewGroup container, int position, Object object) {
-        Fragment fragment = (Fragment)object;
-        if (fragment != mCurrentPrimaryItem) {
-            if (mCurrentPrimaryItem != null) {
-                mCurrentPrimaryItem.setMenuVisibility(false);
-                mCurrentPrimaryItem.setUserVisibleHint(false);
-            }
-            if (fragment != null) {
-                fragment.setMenuVisibility(true);
-                fragment.setUserVisibleHint(true);
-            }
-            mCurrentPrimaryItem = fragment;
-        }
-    }
-
-    @Override
-    public void finishUpdate(ViewGroup container) {
-        if (mCurTransaction != null) {
-            mCurTransaction.commitAllowingStateLoss();
-            mCurTransaction = null;
-            mFragmentManager.executePendingTransactions();
-        }
-    }
-
-    @Override
-    public boolean isViewFromObject(View view, Object object) {
-        return ((Fragment)object).getView() == view;
-    }
-
-    @Override
-    public Parcelable saveState() {
-        Bundle state = null;
-        if (mSavedState.size() > 0) {
-            state = new Bundle();
-            Fragment.SavedState[] fss = new Fragment.SavedState[mSavedState.size()];
-            mSavedState.toArray(fss);
-            state.putParcelableArray("states", fss);
-        }
-        for (int i=0; i<mFragments.size(); i++) {
-            Fragment f = mFragments.get(i);
-            if (f != null) {
-                if (state == null) {
-                    state = new Bundle();
-                }
-                String key = "f" + i;
-                mFragmentManager.putFragment(state, key, f);
-            }
-        }
-        return state;
-    }
-
-    @Override
-    public void restoreState(Parcelable state, ClassLoader loader) {
-        if (state != null) {
-            Bundle bundle = (Bundle)state;
-            bundle.setClassLoader(loader);
-            Parcelable[] fss = bundle.getParcelableArray("states");
-            mSavedState.clear();
-            mFragments.clear();
-            if (fss != null) {
-                for (int i=0; i<fss.length; i++) {
-                    mSavedState.add((Fragment.SavedState)fss[i]);
-                }
-            }
-            Iterable<String> keys = bundle.keySet();
-            for (String key: keys) {
-                if (key.startsWith("f")) {
-                    int index = Integer.parseInt(key.substring(1));
-                    Fragment f = mFragmentManager.getFragment(bundle, key);
-                    if (f != null) {
-                        while (mFragments.size() <= index) {
-                            mFragments.add(null);
-                        }
-                        f.setMenuVisibility(false);
-                        mFragments.set(index, f);
-                    } else {
-                        Log.w(TAG, "Bad fragment at key " + key);
-                    }
-                }
-            }
-        }
-    }
-}
diff --git a/main/src/ui/java/android/support/v4n/view/PagerAdapter.java b/main/src/ui/java/android/support/v4n/view/PagerAdapter.java
deleted file mode 100644
index 79177c02..00000000
--- a/main/src/ui/java/android/support/v4n/view/PagerAdapter.java
+++ /dev/null
@@ -1,320 +0,0 @@
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v4n.view;
-
-import android.database.DataSetObservable;
-import android.database.DataSetObserver;
-import android.os.Parcelable;
-import android.view.View;
-import android.view.ViewGroup;
-
-/**
- * Base class providing the adapter to populate pages inside of
- * a {@link ViewPager}.  You will most likely want to use a more
- * specific implementation of this, such as
- * {@link android.support.v4n.app.FragmentPagerAdapter} or
- * {@link androidx.core.app.FragmentStatePagerAdapter}.
- *
- * <p>When you implement a PagerAdapter, you must override the following methods
- * at minimum:</p>
- * <ul>
- * <li>{@link #instantiateItem(ViewGroup, int)}</li>
- * <li>{@link #destroyItem(ViewGroup, int, Object)}</li>
- * <li>{@link #getCount()}</li>
- * <li>{@link #isViewFromObject(View, Object)}</li>
- * </ul>
- *
- * <p>PagerAdapter is more general than the adapters used for
- * {@link android.widget.AdapterView AdapterViews}. Instead of providing a
- * View recycling mechanism directly ViewPager uses callbacks to indicate the
- * steps taken during an update. A PagerAdapter may implement a form of View
- * recycling if desired or use a more sophisticated method of managing page
- * Views such as Fragment transactions where each page is represented by its
- * own Fragment.</p>
- *
- * <p>ViewPager associates each page with a key Object instead of working with
- * Views directly. This key is used to track and uniquely identify a given page
- * independent of its position in the adapter. A call to the PagerAdapter method
- * {@link #startUpdate(ViewGroup)} indicates that the contents of the ViewPager
- * are about to change. One or more calls to {@link #instantiateItem(ViewGroup, int)}
- * and/or {@link #destroyItem(ViewGroup, int, Object)} will follow, and the end
- * of an update will be signaled by a call to {@link #finishUpdate(ViewGroup)}.
- * By the time {@link #finishUpdate(ViewGroup) finishUpdate} returns the views
- * associated with the key objects returned by
- * {@link #instantiateItem(ViewGroup, int) instantiateItem} should be added to
- * the parent ViewGroup passed to these methods and the views associated with
- * the keys passed to {@link #destroyItem(ViewGroup, int, Object) destroyItem}
- * should be removed. The method {@link #isViewFromObject(View, Object)} identifies
- * whether a page View is associated with a given key object.</p>
- *
- * <p>A very simple PagerAdapter may choose to use the page Views themselves
- * as key objects, returning them from {@link #instantiateItem(ViewGroup, int)}
- * after creation and adding them to the parent ViewGroup. A matching
- * {@link #destroyItem(ViewGroup, int, Object)} implementation would remove the
- * View from the parent ViewGroup and {@link #isViewFromObject(View, Object)}
- * could be implemented as <code>return view == object;</code>.</p>
- *
- * <p>PagerAdapter supports data set changes. Data set changes must occur on the
- * main thread and must end with a call to {@link #notifyDataSetChanged()} similar
- * to AdapterView adapters derived from {@link android.widget.BaseAdapter}. A data
- * set change may involve pages being added, removed, or changing position. The
- * ViewPager will keep the current page active provided the adapter implements
- * the method {@link #getItemPosition(Object)}.</p>
- */
-public abstract class PagerAdapter {
-    private DataSetObservable mObservable = new DataSetObservable();
-
-    public static final int POSITION_UNCHANGED = -1;
-    public static final int POSITION_NONE = -2;
-
-    /**
-     * Return the number of views available.
-     */
-    public abstract int getCount();
-
-    /**
-     * Called when a change in the shown pages is going to start being made.
-     * @param container The containing View which is displaying this adapter's
-     * page views.
-     */
-    public void startUpdate(ViewGroup container) {
-        startUpdate((View) container);
-    }
-
-    /**
-     * Create the page for the given position.  The adapter is responsible
-     * for adding the view to the container given here, although it only
-     * must ensure this is done by the time it returns from
-     * {@link #finishUpdate(ViewGroup)}.
-     *
-     * @param container The containing View in which the page will be shown.
-     * @param position The page position to be instantiated.
-     * @return Returns an Object representing the new page.  This does not
-     * need to be a View, but can be some other container of the page.
-     */
-    public Object instantiateItem(ViewGroup container, int position) {
-        return instantiateItem((View) container, position);
-    }
-
-    /**
-     * Remove a page for the given position.  The adapter is responsible
-     * for removing the view from its container, although it only must ensure
-     * this is done by the time it returns from {@link #finishUpdate(ViewGroup)}.
-     *
-     * @param container The containing View from which the page will be removed.
-     * @param position The page position to be removed.
-     * @param object The same object that was returned by
-     * {@link #instantiateItem(View, int)}.
-     */
-    public void destroyItem(ViewGroup container, int position, Object object) {
-        destroyItem((View) container, position, object);
-    }
-
-    /**
-     * Called to inform the adapter of which item is currently considered to
-     * be the "primary", that is the one show to the user as the current page.
-     *
-     * @param container The containing View from which the page will be removed.
-     * @param position The page position that is now the primary.
-     * @param object The same object that was returned by
-     * {@link #instantiateItem(View, int)}.
-     */
-    public void setPrimaryItem(ViewGroup container, int position, Object object) {
-        setPrimaryItem((View) container, position, object);
-    }
-
-    /**
-     * Called when the a change in the shown pages has been completed.  At this
-     * point you must ensure that all of the pages have actually been added or
-     * removed from the container as appropriate.
-     * @param container The containing View which is displaying this adapter's
-     * page views.
-     */
-    public void finishUpdate(ViewGroup container) {
-        finishUpdate((View) container);
-    }
-
-    /**
-     * Called when a change in the shown pages is going to start being made.
-     * @param container The containing View which is displaying this adapter's
-     * page views.
-     *
-     * @deprecated Use {@link #startUpdate(ViewGroup)}
-     */
-    public void startUpdate(View container) {
-    }
-
-    /**
-     * Create the page for the given position.  The adapter is responsible
-     * for adding the view to the container given here, although it only
-     * must ensure this is done by the time it returns from
-     * {@link #finishUpdate(ViewGroup)}.
-     *
-     * @param container The containing View in which the page will be shown.
-     * @param position The page position to be instantiated.
-     * @return Returns an Object representing the new page.  This does not
-     * need to be a View, but can be some other container of the page.
-     *
-     * @deprecated Use {@link #instantiateItem(ViewGroup, int)}
-     */
-    public Object instantiateItem(View container, int position) {
-        throw new UnsupportedOperationException(
-                "Required method instantiateItem was not overridden");
-    }
-
-    /**
-     * Remove a page for the given position.  The adapter is responsible
-     * for removing the view from its container, although it only must ensure
-     * this is done by the time it returns from {@link #finishUpdate(View)}.
-     *
-     * @param container The containing View from which the page will be removed.
-     * @param position The page position to be removed.
-     * @param object The same object that was returned by
-     * {@link #instantiateItem(View, int)}.
-     *
-     * @deprecated Use {@link #destroyItem(ViewGroup, int, Object)}
-     */
-    public void destroyItem(View container, int position, Object object) {
-        throw new UnsupportedOperationException("Required method destroyItem was not overridden");
-    }
-
-    /**
-     * Called to inform the adapter of which item is currently considered to
-     * be the "primary", that is the one show to the user as the current page.
-     *
-     * @param container The containing View from which the page will be removed.
-     * @param position The page position that is now the primary.
-     * @param object The same object that was returned by
-     * {@link #instantiateItem(View, int)}.
-     *
-     * @deprecated Use {@link #setPrimaryItem(ViewGroup, int, Object)}
-     */
-    public void setPrimaryItem(View container, int position, Object object) {
-    }
-
-    /**
-     * Called when the a change in the shown pages has been completed.  At this
-     * point you must ensure that all of the pages have actually been added or
-     * removed from the container as appropriate.
-     * @param container The containing View which is displaying this adapter's
-     * page views.
-     *
-     * @deprecated Use {@link #finishUpdate(ViewGroup)}
-     */
-    public void finishUpdate(View container) {
-    }
-
-    /**
-     * Determines whether a page View is associated with a specific key object
-     * as returned by {@link #instantiateItem(ViewGroup, int)}. This method is
-     * required for a PagerAdapter to function properly.
-     *
-     * @param view Page View to check for association with <code>object</code>
-     * @param object Object to check for association with <code>view</code>
-     * @return true if <code>view</code> is associated with the key object <code>object</code>
-     */
-    public abstract boolean isViewFromObject(View view, Object object);
-
-    /**
-     * Save any instance state associated with this adapter and its pages that should be
-     * restored if the current UI state needs to be reconstructed.
-     *
-     * @return Saved state for this adapter
-     */
-    public Parcelable saveState() {
-        return null;
-    }
-
-    /**
-     * Restore any instance state associated with this adapter and its pages
-     * that was previously saved by {@link #saveState()}.
-     *
-     * @param state State previously saved by a call to {@link #saveState()}
-     * @param loader A ClassLoader that should be used to instantiate any restored objects
-     */
-    public void restoreState(Parcelable state, ClassLoader loader) {
-    }
-
-    /**
-     * Called when the host view is attempting to determine if an item's position
-     * has changed. Returns {@link #POSITION_UNCHANGED} if the position of the given
-     * item has not changed or {@link #POSITION_NONE} if the item is no longer present
-     * in the adapter.
-     *
-     * <p>The default implementation assumes that items will never
-     * change position and always returns {@link #POSITION_UNCHANGED}.
-     *
-     * @param object Object representing an item, previously returned by a call to
-     *               {@link #instantiateItem(View, int)}.
-     * @return object's new position index from [0, {@link #getCount()}),
-     *         {@link #POSITION_UNCHANGED} if the object's position has not changed,
-     *         or {@link #POSITION_NONE} if the item is no longer present.
-     */
-    public int getItemPosition(Object object) {
-        return POSITION_UNCHANGED;
-    }
-
-    /**
-     * This method should be called by the application if the data backing this adapter has changed
-     * and associated views should update.
-     */
-    public void notifyDataSetChanged() {
-        mObservable.notifyChanged();
-    }
-
-    /**
-     * Register an observer to receive callbacks related to the adapter's data changing.
-     *
-     * @param observer The {@link android.database.DataSetObserver} which will receive callbacks.
-     */
-    public void registerDataSetObserver(DataSetObserver observer) {
-        mObservable.registerObserver(observer);
-    }
-
-    /**
-     * Unregister an observer from callbacks related to the adapter's data changing.
-     *
-     * @param observer The {@link android.database.DataSetObserver} which will be unregistered.
-     */
-    public void unregisterDataSetObserver(DataSetObserver observer) {
-        mObservable.unregisterObserver(observer);
-    }
-
-    /**
-     * This method may be called by the ViewPager to obtain a title string
-     * to describe the specified page. This method may return null
-     * indicating no title for this page. The default implementation returns
-     * null.
-     *
-     * @param position The position of the title requested
-     * @return A title for the requested page
-     */
-    public CharSequence getPageTitle(int position) {
-        return null;
-    }
-
-    /**
-     * Returns the proportional width of a given page as a percentage of the
-     * ViewPager's measured width from (0.f-1.f]
-     *
-     * @param position The position of the page requested
-     * @return Proportional width for the given page position
-     */
-    public float getPageWidth(int position) {
-        return 1.f;
-    }
-}
diff --git a/main/src/ui/java/android/support/v4n/view/ViewPager.java b/main/src/ui/java/android/support/v4n/view/ViewPager.java
deleted file mode 100644
index aa360aa2..00000000
--- a/main/src/ui/java/android/support/v4n/view/ViewPager.java
+++ /dev/null
@@ -1,2896 +0,0 @@
-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.support.v4n.view;
-
-import android.annotation.SuppressLint;
-import android.annotation.TargetApi;
-import android.content.Context;
-import android.content.res.Resources;
-import android.content.res.TypedArray;
-import android.database.DataSetObserver;
-import android.graphics.Canvas;
-import android.graphics.Rect;
-import android.graphics.drawable.Drawable;
-import android.os.Build;
-import android.os.Bundle;
-import android.os.Parcel;
-import android.os.Parcelable;
-import android.os.SystemClock;
-import androidx.annotation.DrawableRes;
-import androidx.core.os.ParcelableCompat;
-import androidx.core.os.ParcelableCompatCreatorCallbacks;
-import androidx.core.view.AccessibilityDelegateCompat;
-import androidx.core.view.MotionEventCompat;
-import androidx.core.view.VelocityTrackerCompat;
-import androidx.core.view.ViewCompat;
-import androidx.core.view.ViewConfigurationCompat;
-import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
-import androidx.core.view.accessibility.AccessibilityRecordCompat;
-import androidx.core.widget.EdgeEffectCompat;
-import android.util.AttributeSet;
-import android.util.Log;
-import android.view.FocusFinder;
-import android.view.Gravity;
-import android.view.KeyEvent;
-import android.view.MotionEvent;
-import android.view.SoundEffectConstants;
-import android.view.VelocityTracker;
-import android.view.View;
-import android.view.ViewConfiguration;
-import android.view.ViewGroup;
-import android.view.ViewParent;
-import android.view.accessibility.AccessibilityEvent;
-import android.view.animation.Interpolator;
-import android.widget.Scroller;
-
-import java.lang.reflect.Method;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
-
-/**
- * Layout manager that allows the user to flip left and right
- * through pages of data.  You supply an implementation of a
- * {@link PagerAdapter} to generate the pages that the view shows.
- *
- * <p>Note this class is currently under early design and
- * development.  The API will likely change in later updates of
- * the compatibility library, requiring changes to the source code
- * of apps when they are compiled against the newer version.</p>
- *
- * <p>ViewPager is most often used in conjunction with {@link android.app.Fragment},
- * which is a convenient way to supply and manage the lifecycle of each page.
- * There are standard adapters implemented for using fragments with the ViewPager,
- * which cover the most common use cases.  These are
- * {@link android.support.v4n.app.FragmentPagerAdapter} and
- * {@link androidx.core.app.FragmentStatePagerAdapter}; each of these
- * classes have simple code showing how to build a full user interface
- * with them.
- *
- * <p>For more information about how to use ViewPager, read <a
- * href="{@docRoot}training/implementing-navigation/lateral.html">Creating Swipe Views with
- * Tabs</a>.</p>
- *
- * <p>Below is a more complicated example of ViewPager, using it in conjunction
- * with {@link android.app.ActionBar} tabs.  You can find other examples of using
- * ViewPager in the API 4+ Support Demos and API 13+ Support Demos sample code.
- *
- * {@sample development/samples/Support13Demos/src/com/example/android/supportv13/app/ActionBarTabsPager.java
- *      complete}
- */
-public class ViewPager extends ViewGroup {
-    private static final String TAG = "ViewPager";
-    private static final boolean DEBUG = false;
-
-    private static final boolean USE_CACHE = false;
-
-    private static final int DEFAULT_OFFSCREEN_PAGES = 1;
-    private static final int MAX_SETTLE_DURATION = 600; // ms
-    private static final int MIN_DISTANCE_FOR_FLING = 25; // dips
-
-    private static final int DEFAULT_GUTTER_SIZE = 16; // dips
-
-    private static final int MIN_FLING_VELOCITY = 400; // dips
-
-    private static final int[] LAYOUT_ATTRS = new int[] {
-        android.R.attr.layout_gravity
-    };
-
-    /**
-     * Used to track what the expected number of items in the adapter should be.
-     * If the app changes this when we don't expect it, we'll throw a big obnoxious exception.
-     */
-    private int mExpectedAdapterCount;
-
-    static class ItemInfo {
-        Object object;
-        int position;
-        boolean scrolling;
-        float widthFactor;
-        float offset;
-    }
-
-    private static final Comparator<ItemInfo> COMPARATOR = new Comparator<ItemInfo>(){
-        @Override
-        public int compare(ItemInfo lhs, ItemInfo rhs) {
-            return lhs.position - rhs.position;
-        }
-    };
-
-    private static final Interpolator sInterpolator = new Interpolator() {
-        public float getInterpolation(float t) {
-            t -= 1.0f;
-            return t * t * t * t * t + 1.0f;
-        }
-    };
-
-    private final ArrayList<ItemInfo> mItems = new ArrayList<ItemInfo>();
-    private final ItemInfo mTempItem = new ItemInfo();
-
-    private final Rect mTempRect = new Rect();
-
-    private PagerAdapter mAdapter;
-    private int mCurItem;   // Index of currently displayed page.
-    private int mRestoredCurItem = -1;
-    private Parcelable mRestoredAdapterState = null;
-    private ClassLoader mRestoredClassLoader = null;
-    private Scroller mScroller;
-    private PagerObserver mObserver;
-
-    private int mPageMargin;
-    private Drawable mMarginDrawable;
-    private int mTopPageBounds;
-    private int mBottomPageBounds;
-
-    // Offsets of the first and last items, if known.
-    // Set during population, used to determine if we are at the beginning
-    // or end of the pager data set during touch scrolling.
-    private float mFirstOffset = -Float.MAX_VALUE;
-    private float mLastOffset = Float.MAX_VALUE;
-
-    private int mChildWidthMeasureSpec;
-    private int mChildHeightMeasureSpec;
-    private boolean mInLayout;
-
-    private boolean mScrollingCacheEnabled;
-
-    private boolean mPopulatePending;
-    private int mOffscreenPageLimit = DEFAULT_OFFSCREEN_PAGES;
-
-    private boolean mIsBeingDragged;
-    private boolean mIsUnableToDrag;
-    private boolean mIgnoreGutter;
-    private int mDefaultGutterSize;
-    private int mGutterSize;
-    private int mTouchSlop;
-    /**
-     * Position of the last motion event.
-     */
-    private float mLastMotionX;
-    private float mLastMotionY;
-    private float mInitialMotionX;
-    private float mInitialMotionY;
-    /**
-     * ID of the active pointer. This is used to retain consistency during
-     * drags/flings if multiple pointers are used.
-     */
-    private int mActivePointerId = INVALID_POINTER;
-    /**
-     * Sentinel value for no current active pointer.
-     * Used by {@link #mActivePointerId}.
-     */
-    private static final int INVALID_POINTER = -1;
-
-    /**
-     * Determines speed during touch scrolling
-     */
-    private VelocityTracker mVelocityTracker;
-    private int mMinimumVelocity;
-    private int mMaximumVelocity;
-    private int mFlingDistance;
-    private int mCloseEnough;
-
-    // If the pager is at least this close to its final position, complete the scroll
-    // on touch down and let the user interact with the content inside instead of
-    // "catching" the flinging pager.
-    private static final int CLOSE_ENOUGH = 2; // dp
-
-    private boolean mFakeDragging;
-    private long mFakeDragBeginTime;
-
-    private EdgeEffectCompat mLeftEdge;
-    private EdgeEffectCompat mRightEdge;
-
-    private boolean mFirstLayout = true;
-    private boolean mNeedCalculatePageOffsets = false;
-    private boolean mCalledSuper;
-    private int mDecorChildCount;
-
-    private OnPageChangeListener mOnPageChangeListener;
-    private OnPageChangeListener mInternalPageChangeListener;
-    private OnAdapterChangeListener mAdapterChangeListener;
-    private PageTransformer mPageTransformer;
-    private Method mSetChildrenDrawingOrderEnabled;
-
-    private static final int DRAW_ORDER_DEFAULT = 0;
-    private static final int DRAW_ORDER_FORWARD = 1;
-    private static final int DRAW_ORDER_REVERSE = 2;
-    private int mDrawingOrder;
-    private ArrayList<View> mDrawingOrderedChildren;
-    private static final ViewPositionComparator sPositionComparator = new ViewPositionComparator();
-
-    /**
-     * Indicates that the pager is in an idle, settled state. The current page
-     * is fully in view and no animation is in progress.
-     */
-    public static final int SCROLL_STATE_IDLE = 0;
-
-    /**
-     * Indicates that the pager is currently being dragged by the user.
-     */
-    public static final int SCROLL_STATE_DRAGGING = 1;
-
-    /**
-     * Indicates that the pager is in the process of settling to a final position.
-     */
-    public static final int SCROLL_STATE_SETTLING = 2;
-
-    private final Runnable mEndScrollRunnable = new Runnable() {
-        public void run() {
-            setScrollState(SCROLL_STATE_IDLE);
-            populate();
-        }
-    };
-
-    private int mScrollState = SCROLL_STATE_IDLE;
-
-    /**
-     * Callback interface for responding to changing state of the selected page.
-     */
-    public interface OnPageChangeListener {
-
-        /**
-         * This method will be invoked when the current page is scrolled, either as part
-         * of a programmatically initiated smooth scroll or a user initiated touch scroll.
-         *
-         * @param position Position index of the first page currently being displayed.
-         *                 Page position+1 will be visible if positionOffset is nonzero.
-         * @param positionOffset Value from [0, 1) indicating the offset from the page at position.
-         * @param positionOffsetPixels Value in pixels indicating the offset from position.
-         */
-        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels);
-
-        /**
-         * This method will be invoked when a new page becomes selected. Animation is not
-         * necessarily complete.
-         *
-         * @param position Position index of the new selected page.
-         */
-        public void onPageSelected(int position);
-
-        /**
-         * Called when the scroll state changes. Useful for discovering when the user
-         * begins dragging, when the pager is automatically settling to the current page,
-         * or when it is fully stopped/idle.
-         *
-         * @param state The new scroll state.
-         * @see ViewPager#SCROLL_STATE_IDLE
-         * @see ViewPager#SCROLL_STATE_DRAGGING
-         * @see ViewPager#SCROLL_STATE_SETTLING
-         */
-        public void onPageScrollStateChanged(int state);
-    }
-
-    /**
-     * Simple implementation of the {@link OnPageChangeListener} interface with stub
-     * implementations of each method. Extend this if you do not intend to override
-     * every method of {@link OnPageChangeListener}.
-     */
-    public static class SimpleOnPageChangeListener implements OnPageChangeListener {
-        @Override
-        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
-            // This space for rent
-        }
-
-        @Override
-        public void onPageSelected(int position) {
-            // This space for rent
-        }
-
-        @Override
-        public void onPageScrollStateChanged(int state) {
-            // This space for rent
-        }
-    }
-
-    /**
-     * A PageTransformer is invoked whenever a visible/attached page is scrolled.
-     * This offers an opportunity for the application to apply a custom transformation
-     * to the page views using animation properties.
-     *
-     * <p>As property animation is only supported as of Android 3.0 and forward,
-     * setting a PageTransformer on a ViewPager on earlier platform versions will
-     * be ignored.</p>
-     */
-    public interface PageTransformer {
-        /**
-         * Apply a property transformation to the given page.
-         *
-         * @param page Apply the transformation to this page
-         * @param position Position of page relative to the current front-and-center
-         *                 position of the pager. 0 is front and center. 1 is one full
-         *                 page position to the right, and -1 is one page position to the left.
-         */
-        public void transformPage(View page, float position);
-    }
-
-    /**
-     * Used internally to monitor when adapters are switched.
-     */
-    interface OnAdapterChangeListener {
-        public void onAdapterChanged(PagerAdapter oldAdapter, PagerAdapter newAdapter);
-    }
-
-    /**
-     * Used internally to tag special types of child views that should be added as
-     * pager decorations by default.
-     */
-    interface Decor {}
-
-    public ViewPager(Context context) {
-        super(context);
-        initViewPager();
-    }
-
-    public ViewPager(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        initViewPager();
-    }
-
-    void initViewPager() {
-        setWillNotDraw(false);
-        setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
-        setFocusable(true);
-        final Context context = getContext();
-        mScroller = new Scroller(context, sInterpolator);
-        final ViewConfiguration configuration = ViewConfiguration.get(context);
-        final float density = context.getResources().getDisplayMetrics().density;
-
-        mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
-        mMinimumVelocity = (int) (MIN_FLING_VELOCITY * density);
-        mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
-        mLeftEdge = new EdgeEffectCompat(context);
-        mRightEdge = new EdgeEffectCompat(context);
-
-        mFlingDistance = (int) (MIN_DISTANCE_FOR_FLING * density);
-        mCloseEnough = (int) (CLOSE_ENOUGH * density);
-        mDefaultGutterSize = (int) (DEFAULT_GUTTER_SIZE * density);
-
-        ViewCompat.setAccessibilityDelegate(this, new MyAccessibilityDelegate());
-
-        if (ViewCompat.getImportantForAccessibility(this)
-                == ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
-            ViewCompat.setImportantForAccessibility(this,
-                    ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
-        }
-    }
-
-    @Override
-    protected void onDetachedFromWindow() {
-        removeCallbacks(mEndScrollRunnable);
-        super.onDetachedFromWindow();
-    }
-
-    private void setScrollState(int newState) {
-        if (mScrollState == newState) {
-            return;
-        }
-
-        mScrollState = newState;
-        if (mPageTransformer != null) {
-            // PageTransformers can do complex things that benefit from hardware layers.
-            enableLayers(newState != SCROLL_STATE_IDLE);
-        }
-        if (mOnPageChangeListener != null) {
-            mOnPageChangeListener.onPageScrollStateChanged(newState);
-        }
-    }
-
-    /**
-     * Set a PagerAdapter that will supply views for this pager as needed.
-     *
-     * @param adapter Adapter to use
-     */
-    public void setAdapter(PagerAdapter adapter) {
-        if (mAdapter != null) {
-            mAdapter.unregisterDataSetObserver(mObserver);
-            mAdapter.startUpdate(this);
-            for (int i = 0; i < mItems.size(); i++) {
-                final ItemInfo ii = mItems.get(i);
-                mAdapter.destroyItem(this, ii.position, ii.object);
-            }
-            mAdapter.finishUpdate(this);
-            mItems.clear();
-            removeNonDecorViews();
-            mCurItem = 0;
-            scrollTo(0, 0);
-        }
-
-        final PagerAdapter oldAdapter = mAdapter;
-        mAdapter = adapter;
-        mExpectedAdapterCount = 0;
-
-        if (mAdapter != null) {
-            if (mObserver == null) {
-                mObserver = new PagerObserver();
-            }
-            mAdapter.registerDataSetObserver(mObserver);
-            mPopulatePending = false;
-            final boolean wasFirstLayout = mFirstLayout;
-            mFirstLayout = true;
-            mExpectedAdapterCount = mAdapter.getCount();
-            if (mRestoredCurItem >= 0) {
-                mAdapter.restoreState(mRestoredAdapterState, mRestoredClassLoader);
-                setCurrentItemInternal(mRestoredCurItem, false, true);
-                mRestoredCurItem = -1;
-                mRestoredAdapterState = null;
-                mRestoredClassLoader = null;
-            } else if (!wasFirstLayout) {
-                populate();
-            } else {
-                requestLayout();
-            }
-        }
-
-        if (mAdapterChangeListener != null && oldAdapter != adapter) {
-            mAdapterChangeListener.onAdapterChanged(oldAdapter, adapter);
-        }
-    }
-
-    private void removeNonDecorViews() {
-        for (int i = 0; i < getChildCount(); i++) {
-            final View child = getChildAt(i);
-            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-            if (!lp.isDecor) {
-                removeViewAt(i);
-                i--;
-            }
-        }
-    }
-
-    /**
-     * Retrieve the current adapter supplying pages.
-     *
-     * @return The currently registered PagerAdapter
-     */
-    public PagerAdapter getAdapter() {
-        return mAdapter;
-    }
-
-    void setOnAdapterChangeListener(OnAdapterChangeListener listener) {
-        mAdapterChangeListener = listener;
-    }
-
-    private int getClientWidth() {
-        return getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
-    }
-
-    /**
-     * Set the currently selected page. If the ViewPager has already been through its first
-     * layout with its current adapter there will be a smooth animated transition between
-     * the current item and the specified item.
-     *
-     * @param item Item index to select
-     */
-    public void setCurrentItem(int item) {
-        mPopulatePending = false;
-        setCurrentItemInternal(item, !mFirstLayout, false);
-    }
-
-    /**
-     * Set the currently selected page.
-     *
-     * @param item Item index to select
-     * @param smoothScroll True to smoothly scroll to the new item, false to transition immediately
-     */
-    public void setCurrentItem(int item, boolean smoothScroll) {
-        mPopulatePending = false;
-        setCurrentItemInternal(item, smoothScroll, false);
-    }
-
-    public int getCurrentItem() {
-        return mCurItem;
-    }
-
-    void setCurrentItemInternal(int item, boolean smoothScroll, boolean always) {
-        setCurrentItemInternal(item, smoothScroll, always, 0);
-    }
-
-    void setCurrentItemInternal(int item, boolean smoothScroll, boolean always, int velocity) {
-        if (mAdapter == null || mAdapter.getCount() <= 0) {
-            setScrollingCacheEnabled(false);
-            return;
-        }
-        if (!always && mCurItem == item && mItems.size() != 0) {
-            setScrollingCacheEnabled(false);
-            return;
-        }
-
-        if (item < 0) {
-            item = 0;
-        } else if (item >= mAdapter.getCount()) {
-            item = mAdapter.getCount() - 1;
-        }
-        final int pageLimit = mOffscreenPageLimit;
-        if (item > (mCurItem + pageLimit) || item < (mCurItem - pageLimit)) {
-            // We are doing a jump by more than one page.  To avoid
-            // glitches, we want to keep all current pages in the view
-            // until the scroll ends.
-            for (int i=0; i<mItems.size(); i++) {
-                mItems.get(i).scrolling = true;
-            }
-        }
-        final boolean dispatchSelected = mCurItem != item;
-
-        if (mFirstLayout) {
-            // We don't have any idea how big we are yet and shouldn't have any pages either.
-            // Just set things up and let the pending layout handle things.
-            mCurItem = item;
-            if (dispatchSelected && mOnPageChangeListener != null) {
-                mOnPageChangeListener.onPageSelected(item);
-            }
-            if (dispatchSelected && mInternalPageChangeListener != null) {
-                mInternalPageChangeListener.onPageSelected(item);
-            }
-            requestLayout();
-        } else {
-            populate(item);
-            scrollToItem(item, smoothScroll, velocity, dispatchSelected);
-        }
-    }
-
-    private void scrollToItem(int item, boolean smoothScroll, int velocity,
-            boolean dispatchSelected) {
-        final ItemInfo curInfo = infoForPosition(item);
-        int destX = 0;
-        if (curInfo != null) {
-            final int width = getClientWidth();
-            destX = (int) (width * Math.max(mFirstOffset,
-                    Math.min(curInfo.offset, mLastOffset)));
-        }
-        if (smoothScroll) {
-            smoothScrollTo(destX, 0, velocity);
-            if (dispatchSelected && mOnPageChangeListener != null) {
-                mOnPageChangeListener.onPageSelected(item);
-            }
-            if (dispatchSelected && mInternalPageChangeListener != null) {
-                mInternalPageChangeListener.onPageSelected(item);
-            }
-        } else {
-            if (dispatchSelected && mOnPageChangeListener != null) {
-                mOnPageChangeListener.onPageSelected(item);
-            }
-            if (dispatchSelected && mInternalPageChangeListener != null) {
-                mInternalPageChangeListener.onPageSelected(item);
-            }
-            completeScroll(false);
-            scrollTo(destX, 0);
-            pageScrolled(destX);
-        }
-    }
-
-    /**
-     * Set a listener that will be invoked whenever the page changes or is incrementally
-     * scrolled. See {@link OnPageChangeListener}.
-     *
-     * @param listener Listener to set
-     */
-    public void setOnPageChangeListener(OnPageChangeListener listener) {
-        mOnPageChangeListener = listener;
-    }
-
-    /**
-     * Set a {@link PageTransformer} that will be called for each attached page whenever
-     * the scroll position is changed. This allows the application to apply custom property
-     * transformations to each page, overriding the default sliding look and feel.
-     *
-     * <p><em>Note:</em> Prior to Android 3.0 the property animation APIs did not exist.
-     * As a result, setting a PageTransformer prior to Android 3.0 (API 11) will have no effect.</p>
-     *
-     * @param reverseDrawingOrder true if the supplied PageTransformer requires page views
-     *                            to be drawn from last to first instead of first to last.
-     * @param transformer PageTransformer that will modify each page's animation properties
-     */
-    public void setPageTransformer(boolean reverseDrawingOrder, PageTransformer transformer) {
-        if (Build.VERSION.SDK_INT >= 11) {
-            final boolean hasTransformer = transformer != null;
-            final boolean needsPopulate = hasTransformer != (mPageTransformer != null);
-            mPageTransformer = transformer;
-            setChildrenDrawingOrderEnabledCompat(hasTransformer);
-            if (hasTransformer) {
-                mDrawingOrder = reverseDrawingOrder ? DRAW_ORDER_REVERSE : DRAW_ORDER_FORWARD;
-            } else {
-                mDrawingOrder = DRAW_ORDER_DEFAULT;
-            }
-            if (needsPopulate) populate();
-        }
-    }
-
-    void setChildrenDrawingOrderEnabledCompat(boolean enable) {
-        if (Build.VERSION.SDK_INT >= 7) {
-            if (mSetChildrenDrawingOrderEnabled == null) {
-                try {
-                    mSetChildrenDrawingOrderEnabled = ViewGroup.class.getDeclaredMethod(
-                            "setChildrenDrawingOrderEnabled", new Class[] { Boolean.TYPE });
-                } catch (NoSuchMethodException e) {
-                    Log.e(TAG, "Can't find setChildrenDrawingOrderEnabled", e);
-                }
-            }
-            try {
-                mSetChildrenDrawingOrderEnabled.invoke(this, enable);
-            } catch (Exception e) {
-                Log.e(TAG, "Error changing children drawing order", e);
-            }
-        }
-    }
-
-    @Override
-    protected int getChildDrawingOrder(int childCount, int i) {
-        final int index = mDrawingOrder == DRAW_ORDER_REVERSE ? childCount - 1 - i : i;
-        final int result = ((LayoutParams) mDrawingOrderedChildren.get(index).getLayoutParams()).childIndex;
-        return result;
-    }
-
-    /**
-     * Set a separate OnPageChangeListener for internal use by the support library.
-     *
-     * @param listener Listener to set
-     * @return The old listener that was set, if any.
-     */
-    OnPageChangeListener setInternalPageChangeListener(OnPageChangeListener listener) {
-        OnPageChangeListener oldListener = mInternalPageChangeListener;
-        mInternalPageChangeListener = listener;
-        return oldListener;
-    }
-
-    /**
-     * Returns the number of pages that will be retained to either side of the
-     * current page in the view hierarchy in an idle state. Defaults to 1.
-     *
-     * @return How many pages will be kept offscreen on either side
-     * @see #setOffscreenPageLimit(int)
-     */
-    public int getOffscreenPageLimit() {
-        return mOffscreenPageLimit;
-    }
-
-    /**
-     * Set the number of pages that should be retained to either side of the
-     * current page in the view hierarchy in an idle state. Pages beyond this
-     * limit will be recreated from the adapter when needed.
-     *
-     * <p>This is offered as an optimization. If you know in advance the number
-     * of pages you will need to support or have lazy-loading mechanisms in place
-     * on your pages, tweaking this setting can have benefits in perceived smoothness
-     * of paging animations and interaction. If you have a small number of pages (3-4)
-     * that you can keep active all at once, less time will be spent in layout for
-     * newly created view subtrees as the user pages back and forth.</p>
-     *
-     * <p>You should keep this limit low, especially if your pages have complex layouts.
-     * This setting defaults to 1.</p>
-     *
-     * @param limit How many pages will be kept offscreen in an idle state.
-     */
-    public void setOffscreenPageLimit(int limit) {
-        if (limit < DEFAULT_OFFSCREEN_PAGES) {
-            Log.w(TAG, "Requested offscreen page limit " + limit + " too small; defaulting to " +
-                    DEFAULT_OFFSCREEN_PAGES);
-            limit = DEFAULT_OFFSCREEN_PAGES;
-        }
-        if (limit != mOffscreenPageLimit) {
-            mOffscreenPageLimit = limit;
-            populate();
-        }
-    }
-
-    /**
-     * Set the margin between pages.
-     *
-     * @param marginPixels Distance between adjacent pages in pixels
-     * @see #getPageMargin()
-     * @see #setPageMarginDrawable(Drawable)
-     * @see #setPageMarginDrawable(int)
-     */
-    public void setPageMargin(int marginPixels) {
-        final int oldMargin = mPageMargin;
-        mPageMargin = marginPixels;
-
-        final int width = getWidth();
-        recomputeScrollPosition(width, width, marginPixels, oldMargin);
-
-        requestLayout();
-    }
-
-    /**
-     * Return the margin between pages.
-     *
-     * @return The size of the margin in pixels
-     */
-    public int getPageMargin() {
-        return mPageMargin;
-    }
-
-    /**
-     * Set a drawable that will be used to fill the margin between pages.
-     *
-     * @param d Drawable to display between pages
-     */
-    public void setPageMarginDrawable(Drawable d) {
-        mMarginDrawable = d;
-        if (d != null) refreshDrawableState();
-        setWillNotDraw(d == null);
-        invalidate();
-    }
-
-    /**
-     * Set a drawable that will be used to fill the margin between pages.
-     *
-     * @param resId Resource ID of a drawable to display between pages
-     */
-    public void setPageMarginDrawable(@DrawableRes int resId) {
-        setPageMarginDrawable(getContext().getResources().getDrawable(resId));
-    }
-
-    @Override
-    protected boolean verifyDrawable(Drawable who) {
-        return super.verifyDrawable(who) || who == mMarginDrawable;
-    }
-
-    @Override
-    protected void drawableStateChanged() {
-        super.drawableStateChanged();
-        final Drawable d = mMarginDrawable;
-        if (d != null && d.isStateful()) {
-            d.setState(getDrawableState());
-        }
-    }
-
-    // We want the duration of the page snap animation to be influenced by the distance that
-    // the screen has to travel, however, we don't want this duration to be effected in a
-    // purely linear fashion. Instead, we use this method to moderate the effect that the distance
-    // of travel has on the overall snap duration.
-    float distanceInfluenceForSnapDuration(float f) {
-        f -= 0.5f; // center the values about 0.
-        f *= 0.3f * Math.PI / 2.0f;
-        return (float) Math.sin(f);
-    }
-
-    /**
-     * Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
-     *
-     * @param x the number of pixels to scroll by on the X axis
-     * @param y the number of pixels to scroll by on the Y axis
-     */
-    void smoothScrollTo(int x, int y) {
-        smoothScrollTo(x, y, 0);
-    }
-
-    /**
-     * Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
-     *
-     * @param x the number of pixels to scroll by on the X axis
-     * @param y the number of pixels to scroll by on the Y axis
-     * @param velocity the velocity associated with a fling, if applicable. (0 otherwise)
-     */
-    void smoothScrollTo(int x, int y, int velocity) {
-        if (getChildCount() == 0) {
-            // Nothing to do.
-            setScrollingCacheEnabled(false);
-            return;
-        }
-        int sx = getScrollX();
-        int sy = getScrollY();
-        int dx = x - sx;
-        int dy = y - sy;
-        if (dx == 0 && dy == 0) {
-            completeScroll(false);
-            populate();
-            setScrollState(SCROLL_STATE_IDLE);
-            return;
-        }
-
-        setScrollingCacheEnabled(true);
-        setScrollState(SCROLL_STATE_SETTLING);
-
-        final int width = getClientWidth();
-        final int halfWidth = width / 2;
-        final float distanceRatio = Math.min(1f, 1.0f * Math.abs(dx) / width);
-        final float distance = halfWidth + halfWidth *
-                distanceInfluenceForSnapDuration(distanceRatio);
-
-        int duration = 0;
-        velocity = Math.abs(velocity);
-        if (velocity > 0) {
-            duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
-        } else {
-            final float pageWidth = width * mAdapter.getPageWidth(mCurItem);
-            final float pageDelta = (float) Math.abs(dx) / (pageWidth + mPageMargin);
-            duration = (int) ((pageDelta + 1) * 100);
-        }
-        duration = Math.min(duration, MAX_SETTLE_DURATION);
-
-        mScroller.startScroll(sx, sy, dx, dy, duration);
-        ViewCompat.postInvalidateOnAnimation(this);
-    }
-
-    ItemInfo addNewItem(int position, int index) {
-        ItemInfo ii = new ItemInfo();
-        ii.position = position;
-        ii.object = mAdapter.instantiateItem(this, position);
-        ii.widthFactor = mAdapter.getPageWidth(position);
-        if (index < 0 || index >= mItems.size()) {
-            mItems.add(ii);
-        } else {
-            mItems.add(index, ii);
-        }
-        return ii;
-    }
-
-    void dataSetChanged() {
-        // This method only gets called if our observer is attached, so mAdapter is non-null.
-
-        final int adapterCount = mAdapter.getCount();
-        mExpectedAdapterCount = adapterCount;
-        boolean needPopulate = mItems.size() < mOffscreenPageLimit * 2 + 1 &&
-                mItems.size() < adapterCount;
-        int newCurrItem = mCurItem;
-
-        boolean isUpdating = false;
-        for (int i = 0; i < mItems.size(); i++) {
-            final ItemInfo ii = mItems.get(i);
-            final int newPos = mAdapter.getItemPosition(ii.object);
-
-            if (newPos == PagerAdapter.POSITION_UNCHANGED) {
-                continue;
-            }
-
-            if (newPos == PagerAdapter.POSITION_NONE) {
-                mItems.remove(i);
-                i--;
-
-                if (!isUpdating) {
-                    mAdapter.startUpdate(this);
-                    isUpdating = true;
-                }
-
-                mAdapter.destroyItem(this, ii.position, ii.object);
-                needPopulate = true;
-
-                if (mCurItem == ii.position) {
-                    // Keep the current item in the valid range
-                    newCurrItem = Math.max(0, Math.min(mCurItem, adapterCount - 1));
-                    needPopulate = true;
-                }
-                continue;
-            }
-
-            if (ii.position != newPos) {
-                if (ii.position == mCurItem) {
-                    // Our current item changed position. Follow it.
-                    newCurrItem = newPos;
-                }
-
-                ii.position = newPos;
-                needPopulate = true;
-            }
-        }
-
-        if (isUpdating) {
-            mAdapter.finishUpdate(this);
-        }
-
-        Collections.sort(mItems, COMPARATOR);
-
-        if (needPopulate) {
-            // Reset our known page widths; populate will recompute them.
-            final int childCount = getChildCount();
-            for (int i = 0; i < childCount; i++) {
-                final View child = getChildAt(i);
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-                if (!lp.isDecor) {
-                    lp.widthFactor = 0.f;
-                }
-            }
-
-            setCurrentItemInternal(newCurrItem, false, true);
-            requestLayout();
-        }
-    }
-
-    void populate() {
-        populate(mCurItem);
-    }
-
-    void populate(int newCurrentItem) {
-        ItemInfo oldCurInfo = null;
-        int focusDirection = View.FOCUS_FORWARD;
-        if (mCurItem != newCurrentItem) {
-            focusDirection = mCurItem < newCurrentItem ? View.FOCUS_RIGHT : View.FOCUS_LEFT;
-            oldCurInfo = infoForPosition(mCurItem);
-            mCurItem = newCurrentItem;
-        }
-
-        if (mAdapter == null) {
-            sortChildDrawingOrder();
-            return;
-        }
-
-        // Bail now if we are waiting to populate.  This is to hold off
-        // on creating views from the time the user releases their finger to
-        // fling to a new position until we have finished the scroll to
-        // that position, avoiding glitches from happening at that point.
-        if (mPopulatePending) {
-            if (DEBUG) Log.i(TAG, "populate is pending, skipping for now...");
-            sortChildDrawingOrder();
-            return;
-        }
-
-        // Also, don't populate until we are attached to a window.  This is to
-        // avoid trying to populate before we have restored our view hierarchy
-        // state and conflicting with what is restored.
-        if (getWindowToken() == null) {
-            return;
-        }
-
-        mAdapter.startUpdate(this);
-
-        final int pageLimit = mOffscreenPageLimit;
-        final int startPos = Math.max(0, mCurItem - pageLimit);
-        final int N = mAdapter.getCount();
-        final int endPos = Math.min(N-1, mCurItem + pageLimit);
-
-        if (N != mExpectedAdapterCount) {
-            String resName;
-            try {
-                resName = getResources().getResourceName(getId());
-            } catch (Resources.NotFoundException e) {
-                resName = Integer.toHexString(getId());
-            }
-            throw new IllegalStateException("The application's PagerAdapter changed the adapter's" +
-                    " contents without calling PagerAdapter#notifyDataSetChanged!" +
-                    " Expected adapter item count: " + mExpectedAdapterCount + ", found: " + N +
-                    " Pager id: " + resName +
-                    " Pager class: " + getClass() +
-                    " Problematic adapter: " + mAdapter.getClass());
-        }
-
-        // Locate the currently focused item or add it if needed.
-        int curIndex = -1;
-        ItemInfo curItem = null;
-        for (curIndex = 0; curIndex < mItems.size(); curIndex++) {
-            final ItemInfo ii = mItems.get(curIndex);
-            if (ii.position >= mCurItem) {
-                if (ii.position == mCurItem) curItem = ii;
-                break;
-            }
-        }
-
-        if (curItem == null && N > 0) {
-            curItem = addNewItem(mCurItem, curIndex);
-        }
-
-        // Fill 3x the available width or up to the number of offscreen
-        // pages requested to either side, whichever is larger.
-        // If we have no current item we have no work to do.
-        if (curItem != null) {
-            float extraWidthLeft = 0.f;
-            int itemIndex = curIndex - 1;
-            ItemInfo ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
-            final int clientWidth = getClientWidth();
-            final float leftWidthNeeded = clientWidth <= 0 ? 0 :
-                    2.f - curItem.widthFactor + (float) getPaddingLeft() / (float) clientWidth;
-            for (int pos = mCurItem - 1; pos >= 0; pos--) {
-                if (extraWidthLeft >= leftWidthNeeded && pos < startPos) {
-                    if (ii == null) {
-                        break;
-                    }
-                    if (pos == ii.position && !ii.scrolling) {
-                        mItems.remove(itemIndex);
-                        mAdapter.destroyItem(this, pos, ii.object);
-                        if (DEBUG) {
-                            Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
-                                   " view: " + ii.object);
-                        }
-                        itemIndex--;
-                        curIndex--;
-                        ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
-                    }
-                } else if (ii != null && pos == ii.position) {
-                    extraWidthLeft += ii.widthFactor;
-                    itemIndex--;
-                    ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
-                } else {
-                    ii = addNewItem(pos, itemIndex + 1);
-                    extraWidthLeft += ii.widthFactor;
-                    curIndex++;
-                    ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
-                }
-            }
-
-            float extraWidthRight = curItem.widthFactor;
-            itemIndex = curIndex + 1;
-            if (extraWidthRight < 2.f) {
-                ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
-                final float rightWidthNeeded = clientWidth <= 0 ? 0 :
-                        (float) getPaddingRight() / (float) clientWidth + 2.f;
-                for (int pos = mCurItem + 1; pos < N; pos++) {
-                    if (extraWidthRight >= rightWidthNeeded && pos > endPos) {
-                        if (ii == null) {
-                            break;
-                        }
-                        if (pos == ii.position && !ii.scrolling) {
-                            mItems.remove(itemIndex);
-                            mAdapter.destroyItem(this, pos, ii.object);
-                            if (DEBUG) {
-                                Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
-                                        " view: " + (ii.object));
-                            }
-                            ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
-                        }
-                    } else if (ii != null && pos == ii.position) {
-                        extraWidthRight += ii.widthFactor;
-                        itemIndex++;
-                        ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
-                    } else {
-                        ii = addNewItem(pos, itemIndex);
-                        itemIndex++;
-                        extraWidthRight += ii.widthFactor;
-                        ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
-                    }
-                }
-            }
-
-            calculatePageOffsets(curItem, curIndex, oldCurInfo);
-        }
-
-        if (DEBUG) {
-            Log.i(TAG, "Current page list:");
-            for (int i=0; i<mItems.size(); i++) {
-                Log.i(TAG, "#" + i + ": page " + mItems.get(i).position);
-            }
-        }
-
-        mAdapter.setPrimaryItem(this, mCurItem, curItem != null ? curItem.object : null);
-
-        mAdapter.finishUpdate(this);
-
-        // Check width measurement of current pages and drawing sort order.
-        // Update LayoutParams as needed.
-        final int childCount = getChildCount();
-        for (int i = 0; i < childCount; i++) {
-            final View child = getChildAt(i);
-            final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-            lp.childIndex = i;
-            if (!lp.isDecor && lp.widthFactor == 0.f) {
-                // 0 means requery the adapter for this, it doesn't have a valid width.
-                final ItemInfo ii = infoForChild(child);
-                if (ii != null) {
-                    lp.widthFactor = ii.widthFactor;
-                    lp.position = ii.position;
-                }
-            }
-        }
-        sortChildDrawingOrder();
-
-        if (hasFocus()) {
-            View currentFocused = findFocus();
-            ItemInfo ii = currentFocused != null ? infoForAnyChild(currentFocused) : null;
-            if (ii == null || ii.position != mCurItem) {
-                for (int i=0; i<getChildCount(); i++) {
-                    View child = getChildAt(i);
-                    ii = infoForChild(child);
-                    if (ii != null && ii.position == mCurItem) {
-                        if (child.requestFocus(focusDirection)) {
-                            break;
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    private void sortChildDrawingOrder() {
-        if (mDrawingOrder != DRAW_ORDER_DEFAULT) {
-            if (mDrawingOrderedChildren == null) {
-                mDrawingOrderedChildren = new ArrayList<View>();
-            } else {
-                mDrawingOrderedChildren.clear();
-            }
-            final int childCount = getChildCount();
-            for (int i = 0; i < childCount; i++) {
-                final View child = getChildAt(i);
-                mDrawingOrderedChildren.add(child);
-            }
-            Collections.sort(mDrawingOrderedChildren, sPositionComparator);
-        }
-    }
-
-    private void calculatePageOffsets(ItemInfo curItem, int curIndex, ItemInfo oldCurInfo) {
-        final int N = mAdapter.getCount();
-        final int width = getClientWidth();
-        final float marginOffset = width > 0 ? (float) mPageMargin / width : 0;
-        // Fix up offsets for later layout.
-        if (oldCurInfo != null) {
-            final int oldCurPosition = oldCurInfo.position;
-            // Base offsets off of oldCurInfo.
-            if (oldCurPosition < curItem.position) {
-                int itemIndex = 0;
-                ItemInfo ii = null;
-                float offset = oldCurInfo.offset + oldCurInfo.widthFactor + marginOffset;
-                for (int pos = oldCurPosition + 1;
-                        pos <= curItem.position && itemIndex < mItems.size(); pos++) {
-                    ii = mItems.get(itemIndex);
-                    while (pos > ii.position && itemIndex < mItems.size() - 1) {
-                        itemIndex++;
-                        ii = mItems.get(itemIndex);
-                    }
-                    while (pos < ii.position) {
-                        // We don't have an item populated for this,
-                        // ask the adapter for an offset.
-                        offset += mAdapter.getPageWidth(pos) + marginOffset;
-                        pos++;
-                    }
-                    ii.offset = offset;
-                    offset += ii.widthFactor + marginOffset;
-                }
-            } else if (oldCurPosition > curItem.position) {
-                int itemIndex = mItems.size() - 1;
-                ItemInfo ii = null;
-                float offset = oldCurInfo.offset;
-                for (int pos = oldCurPosition - 1;
-                        pos >= curItem.position && itemIndex >= 0; pos--) {
-                    ii = mItems.get(itemIndex);
-                    while (pos < ii.position && itemIndex > 0) {
-                        itemIndex--;
-                        ii = mItems.get(itemIndex);
-                    }
-                    while (pos > ii.position) {
-                        // We don't have an item populated for this,
-                        // ask the adapter for an offset.
-                        offset -= mAdapter.getPageWidth(pos) + marginOffset;
-                        pos--;
-                    }
-                    offset -= ii.widthFactor + marginOffset;
-                    ii.offset = offset;
-                }
-            }
-        }
-
-        // Base all offsets off of curItem.
-        final int itemCount = mItems.size();
-        float offset = curItem.offset;
-        int pos = curItem.position - 1;
-        mFirstOffset = curItem.position == 0 ? curItem.offset : -Float.MAX_VALUE;
-        mLastOffset = curItem.position == N - 1 ?
-                curItem.offset + curItem.widthFactor - 1 : Float.MAX_VALUE;
-        // Previous pages
-        for (int i = curIndex - 1; i >= 0; i--, pos--) {
-            final ItemInfo ii = mItems.get(i);
-            while (pos > ii.position) {
-                offset -= mAdapter.getPageWidth(pos--) + marginOffset;
-            }
-            offset -= ii.widthFactor + marginOffset;
-            ii.offset = offset;
-            if (ii.position == 0) mFirstOffset = offset;
-        }
-        offset = curItem.offset + curItem.widthFactor + marginOffset;
-        pos = curItem.position + 1;
-        // Next pages
-        for (int i = curIndex + 1; i < itemCount; i++, pos++) {
-            final ItemInfo ii = mItems.get(i);
-            while (pos < ii.position) {
-                offset += mAdapter.getPageWidth(pos++) + marginOffset;
-            }
-            if (ii.position == N - 1) {
-                mLastOffset = offset + ii.widthFactor - 1;
-            }
-            ii.offset = offset;
-            offset += ii.widthFactor + marginOffset;
-        }
-
-        mNeedCalculatePageOffsets = false;
-    }
-
-    /**
-     * This is the persistent state that is saved by ViewPager.  Only needed
-     * if you are creating a sublass of ViewPager that must save its own
-     * state, in which case it should implement a subclass of this which
-     * contains that state.
-     */
-    public static class SavedState extends BaseSavedState {
-        int position;
-        Parcelable adapterState;
-        ClassLoader loader;
-
-        public SavedState(Parcelable superState) {
-            super(superState);
-        }
-
-        @Override
-        public void writeToParcel(Parcel out, int flags) {
-            super.writeToParcel(out, flags);
-            out.writeInt(position);
-            out.writeParcelable(adapterState, flags);
-        }
-
-        @Override
-        public String toString() {
-            return "FragmentPager.SavedState{"
-                    + Integer.toHexString(System.identityHashCode(this))
-                    + " position=" + position + "}";
-        }
-
-        public static final Parcelable.Creator<SavedState> CREATOR
-                = ParcelableCompat.newCreator(new ParcelableCompatCreatorCallbacks<SavedState>() {
-            @TargetApi(24)
-            @Override
-            public SavedState createFromParcel(Parcel in, ClassLoader loader) {
-                return new SavedState(in, loader);
-            }
-
-            @Override
-            public SavedState[] newArray(int size) {
-                return new SavedState[size];
-            }
-        });
-
-        SavedState(Parcel in, ClassLoader loader) {
-            super(in);
-            if (loader == null) {
-                loader = getClass().getClassLoader();
-            }
-            position = in.readInt();
-            adapterState = in.readParcelable(loader);
-            this.loader = loader;
-        }
-    }
-
-    @Override
-    public Parcelable onSaveInstanceState() {
-        Parcelable superState = super.onSaveInstanceState();
-        SavedState ss = new SavedState(superState);
-        ss.position = mCurItem;
-        if (mAdapter != null) {
-            ss.adapterState = mAdapter.saveState();
-        }
-        return ss;
-    }
-
-    @Override
-    public void onRestoreInstanceState(Parcelable state) {
-        if (!(state instanceof SavedState)) {
-            super.onRestoreInstanceState(state);
-            return;
-        }
-
-        SavedState ss = (SavedState)state;
-        super.onRestoreInstanceState(ss.getSuperState());
-
-        if (mAdapter != null) {
-            mAdapter.restoreState(ss.adapterState, ss.loader);
-            setCurrentItemInternal(ss.position, false, true);
-        } else {
-            mRestoredCurItem = ss.position;
-            mRestoredAdapterState = ss.adapterState;
-            mRestoredClassLoader = ss.loader;
-        }
-    }
-
-    @Override
-    public void addView(View child, int index, ViewGroup.LayoutParams params) {
-        if (!checkLayoutParams(params)) {
-            params = generateLayoutParams(params);
-        }
-        final LayoutParams lp = (LayoutParams) params;
-        lp.isDecor |= child instanceof Decor;
-        if (mInLayout) {
-            if (lp != null && lp.isDecor) {
-                throw new IllegalStateException("Cannot add pager decor view during layout");
-            }
-            lp.needsMeasure = true;
-            addViewInLayout(child, index, params);
-        } else {
-            super.addView(child, index, params);
-        }
-
-        if (USE_CACHE) {
-            if (child.getVisibility() != GONE) {
-                child.setDrawingCacheEnabled(mScrollingCacheEnabled);
-            } else {
-                child.setDrawingCacheEnabled(false);
-            }
-        }
-    }
-
-    @Override
-    public void removeView(View view) {
-        if (mInLayout) {
-            removeViewInLayout(view);
-        } else {
-            super.removeView(view);
-        }
-    }
-
-    ItemInfo infoForChild(View child) {
-        for (int i=0; i<mItems.size(); i++) {
-            ItemInfo ii = mItems.get(i);
-            if (mAdapter.isViewFromObject(child, ii.object)) {
-                return ii;
-            }
-        }
-        return null;
-    }
-
-    ItemInfo infoForAnyChild(View child) {
-        ViewParent parent;
-        while ((parent=child.getParent()) != this) {
-            if (parent == null || !(parent instanceof View)) {
-                return null;
-            }
-            child = (View)parent;
-        }
-        return infoForChild(child);
-    }
-
-    ItemInfo infoForPosition(int position) {
-        for (int i = 0; i < mItems.size(); i++) {
-            ItemInfo ii = mItems.get(i);
-            if (ii.position == position) {
-                return ii;
-            }
-        }
-        return null;
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        super.onAttachedToWindow();
-        mFirstLayout = true;
-    }
-
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        // For simple implementation, our internal size is always 0.
-        // We depend on the container to specify the layout size of
-        // our view.  We can't really know what it is since we will be
-        // adding and removing different arbitrary views and do not
-        // want the layout to change as this happens.
-        setMeasuredDimension(getDefaultSize(0, widthMeasureSpec),
-                getDefaultSize(0, heightMeasureSpec));
-
-        final int measuredWidth = getMeasuredWidth();
-        final int maxGutterSize = measuredWidth / 10;
-        mGutterSize = Math.min(maxGutterSize, mDefaultGutterSize);
-
-        // Children are just made to fill our space.
-        int childWidthSize = measuredWidth - getPaddingLeft() - getPaddingRight();
-        int childHeightSize = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
-
-        /*
-         * Make sure all children have been properly measured. Decor views first.
-         * Right now we cheat and make this less complicated by assuming decor
-         * views won't intersect. We will pin to edges based on gravity.
-         */
-        int size = getChildCount();
-        for (int i = 0; i < size; ++i) {
-            final View child = getChildAt(i);
-            if (child.getVisibility() != GONE) {
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-                if (lp != null && lp.isDecor) {
-                    final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
-                    final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
-                    int widthMode = MeasureSpec.AT_MOST;
-                    int heightMode = MeasureSpec.AT_MOST;
-                    boolean consumeVertical = vgrav == Gravity.TOP || vgrav == Gravity.BOTTOM;
-                    boolean consumeHorizontal = hgrav == Gravity.LEFT || hgrav == Gravity.RIGHT;
-
-                    if (consumeVertical) {
-                        widthMode = MeasureSpec.EXACTLY;
-                    } else if (consumeHorizontal) {
-                        heightMode = MeasureSpec.EXACTLY;
-                    }
-
-                    int widthSize = childWidthSize;
-                    int heightSize = childHeightSize;
-                    if (lp.width != LayoutParams.WRAP_CONTENT) {
-                        widthMode = MeasureSpec.EXACTLY;
-                        if (lp.width != LayoutParams.FILL_PARENT) {
-                            widthSize = lp.width;
-                        }
-                    }
-                    if (lp.height != LayoutParams.WRAP_CONTENT) {
-                        heightMode = MeasureSpec.EXACTLY;
-                        if (lp.height != LayoutParams.FILL_PARENT) {
-                            heightSize = lp.height;
-                        }
-                    }
-                    final int widthSpec = MeasureSpec.makeMeasureSpec(widthSize, widthMode);
-                    final int heightSpec = MeasureSpec.makeMeasureSpec(heightSize, heightMode);
-                    child.measure(widthSpec, heightSpec);
-
-                    if (consumeVertical) {
-                        childHeightSize -= child.getMeasuredHeight();
-                    } else if (consumeHorizontal) {
-                        childWidthSize -= child.getMeasuredWidth();
-                    }
-                }
-            }
-        }
-
-        mChildWidthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
-        mChildHeightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeightSize, MeasureSpec.EXACTLY);
-
-        // Make sure we have created all fragments that we need to have shown.
-        mInLayout = true;
-        populate();
-        mInLayout = false;
-
-        // Page views next.
-        size = getChildCount();
-        for (int i = 0; i < size; ++i) {
-            final View child = getChildAt(i);
-            if (child.getVisibility() != GONE) {
-                if (DEBUG) Log.v(TAG, "Measuring #" + i + " " + child
-                        + ": " + mChildWidthMeasureSpec);
-
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-                if (lp == null || !lp.isDecor) {
-                    final int widthSpec = MeasureSpec.makeMeasureSpec(
-                            (int) (childWidthSize * lp.widthFactor), MeasureSpec.EXACTLY);
-                    child.measure(widthSpec, mChildHeightMeasureSpec);
-                }
-            }
-        }
-    }
-
-    @Override
-    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
-        super.onSizeChanged(w, h, oldw, oldh);
-
-        // Make sure scroll position is set correctly.
-        if (w != oldw) {
-            recomputeScrollPosition(w, oldw, mPageMargin, mPageMargin);
-        }
-    }
-
-    private void recomputeScrollPosition(int width, int oldWidth, int margin, int oldMargin) {
-        if (oldWidth > 0 && !mItems.isEmpty()) {
-            final int widthWithMargin = width - getPaddingLeft() - getPaddingRight() + margin;
-            final int oldWidthWithMargin = oldWidth - getPaddingLeft() - getPaddingRight()
-                                           + oldMargin;
-            final int xpos = getScrollX();
-            final float pageOffset = (float) xpos / oldWidthWithMargin;
-            final int newOffsetPixels = (int) (pageOffset * widthWithMargin);
-
-            scrollTo(newOffsetPixels, getScrollY());
-            if (!mScroller.isFinished()) {
-                // We now return to your regularly scheduled scroll, already in progress.
-                final int newDuration = mScroller.getDuration() - mScroller.timePassed();
-                ItemInfo targetInfo = infoForPosition(mCurItem);
-                mScroller.startScroll(newOffsetPixels, 0,
-                        (int) (targetInfo.offset * width), 0, newDuration);
-            }
-        } else {
-            final ItemInfo ii = infoForPosition(mCurItem);
-            final float scrollOffset = ii != null ? Math.min(ii.offset, mLastOffset) : 0;
-            final int scrollPos = (int) (scrollOffset *
-                                         (width - getPaddingLeft() - getPaddingRight()));
-            if (scrollPos != getScrollX()) {
-                completeScroll(false);
-                scrollTo(scrollPos, getScrollY());
-            }
-        }
-    }
-
-    @Override
-    protected void onLayout(boolean changed, int l, int t, int r, int b) {
-        final int count = getChildCount();
-        int width = r - l;
-        int height = b - t;
-        int paddingLeft = getPaddingLeft();
-        int paddingTop = getPaddingTop();
-        int paddingRight = getPaddingRight();
-        int paddingBottom = getPaddingBottom();
-        final int scrollX = getScrollX();
-
-        int decorCount = 0;
-
-        // First pass - decor views. We need to do this in two passes so that
-        // we have the proper offsets for non-decor views later.
-        for (int i = 0; i < count; i++) {
-            final View child = getChildAt(i);
-            if (child.getVisibility() != GONE) {
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-                int childLeft = 0;
-                int childTop = 0;
-                if (lp.isDecor) {
-                    final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
-                    final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
-                    switch (hgrav) {
-                        default:
-                            childLeft = paddingLeft;
-                            break;
-                        case Gravity.LEFT:
-                            childLeft = paddingLeft;
-                            paddingLeft += child.getMeasuredWidth();
-                            break;
-                        case Gravity.CENTER_HORIZONTAL:
-                            childLeft = Math.max((width - child.getMeasuredWidth()) / 2,
-                                    paddingLeft);
-                            break;
-                        case Gravity.RIGHT:
-                            childLeft = width - paddingRight - child.getMeasuredWidth();
-                            paddingRight += child.getMeasuredWidth();
-                            break;
-                    }
-                    switch (vgrav) {
-                        default:
-                            childTop = paddingTop;
-                            break;
-                        case Gravity.TOP:
-                            childTop = paddingTop;
-                            paddingTop += child.getMeasuredHeight();
-                            break;
-                        case Gravity.CENTER_VERTICAL:
-                            childTop = Math.max((height - child.getMeasuredHeight()) / 2,
-                                    paddingTop);
-                            break;
-                        case Gravity.BOTTOM:
-                            childTop = height - paddingBottom - child.getMeasuredHeight();
-                            paddingBottom += child.getMeasuredHeight();
-                            break;
-                    }
-                    childLeft += scrollX;
-                    child.layout(childLeft, childTop,
-                            childLeft + child.getMeasuredWidth(),
-                            childTop + child.getMeasuredHeight());
-                    decorCount++;
-                }
-            }
-        }
-
-        final int childWidth = width - paddingLeft - paddingRight;
-        // Page views. Do this once we have the right padding offsets from above.
-        for (int i = 0; i < count; i++) {
-            final View child = getChildAt(i);
-            if (child.getVisibility() != GONE) {
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-                ItemInfo ii;
-                if (!lp.isDecor && (ii = infoForChild(child)) != null) {
-                    int loff = (int) (childWidth * ii.offset);
-                    int childLeft = paddingLeft + loff;
-                    int childTop = paddingTop;
-                    if (lp.needsMeasure) {
-                        // This was added during layout and needs measurement.
-                        // Do it now that we know what we're working with.
-                        lp.needsMeasure = false;
-                        final int widthSpec = MeasureSpec.makeMeasureSpec(
-                                (int) (childWidth * lp.widthFactor),
-                                MeasureSpec.EXACTLY);
-                        final int heightSpec = MeasureSpec.makeMeasureSpec(
-                                (int) (height - paddingTop - paddingBottom),
-                                MeasureSpec.EXACTLY);
-                        child.measure(widthSpec, heightSpec);
-                    }
-                    int id = -1;
-
-                    if (DEBUG) Log.v(TAG, "Positioning #" + i + " " + child + " f=" + ii.object
-                            + ":" + childLeft + "," + childTop + " " + child.getMeasuredWidth()
-                            + "x" + child.getMeasuredHeight());
-
-                    child.layout(childLeft, childTop,
-                            childLeft + child.getMeasuredWidth(),
-                            childTop + child.getMeasuredHeight());
-                }
-            }
-        }
-        mTopPageBounds = paddingTop;
-        mBottomPageBounds = height - paddingBottom;
-        mDecorChildCount = decorCount;
-
-        if (mFirstLayout) {
-            scrollToItem(mCurItem, false, 0, false);
-        }
-        mFirstLayout = false;
-    }
-
-    @Override
-    public void computeScroll() {
-        if (!mScroller.isFinished() && mScroller.computeScrollOffset()) {
-            int oldX = getScrollX();
-            int oldY = getScrollY();
-            int x = mScroller.getCurrX();
-            int y = mScroller.getCurrY();
-
-            if (oldX != x || oldY != y) {
-                scrollTo(x, y);
-                if (!pageScrolled(x)) {
-                    mScroller.abortAnimation();
-                    scrollTo(0, y);
-                }
-            }
-
-            // Keep on drawing until the animation has finished.
-            ViewCompat.postInvalidateOnAnimation(this);
-            return;
-        }
-
-        // Done with scroll, clean up state.
-        completeScroll(true);
-    }
-
-    private boolean pageScrolled(int xpos) {
-        if (mItems.size() == 0) {
-            mCalledSuper = false;
-            onPageScrolled(0, 0, 0);
-            if (!mCalledSuper) {
-                throw new IllegalStateException(
-                        "onPageScrolled did not call superclass implementation");
-            }
-            return false;
-        }
-        final ItemInfo ii = infoForCurrentScrollPosition();
-        final int width = getClientWidth();
-        final int widthWithMargin = width + mPageMargin;
-        final float marginOffset = (float) mPageMargin / width;
-        final int currentPage = ii.position;
-        final float pageOffset = (((float) xpos / width) - ii.offset) /
-                (ii.widthFactor + marginOffset);
-        final int offsetPixels = (int) (pageOffset * widthWithMargin);
-
-        mCalledSuper = false;
-        onPageScrolled(currentPage, pageOffset, offsetPixels);
-        if (!mCalledSuper) {
-            throw new IllegalStateException(
-                    "onPageScrolled did not call superclass implementation");
-        }
-        return true;
-    }
-
-    /**
-     * This method will be invoked when the current page is scrolled, either as part
-     * of a programmatically initiated smooth scroll or a user initiated touch scroll.
-     * If you override this method you must call through to the superclass implementation
-     * (e.g. super.onPageScrolled(position, offset, offsetPixels)) before onPageScrolled
-     * returns.
-     *
-     * @param position Position index of the first page currently being displayed.
-     *                 Page position+1 will be visible if positionOffset is nonzero.
-     * @param offset Value from [0, 1) indicating the offset from the page at position.
-     * @param offsetPixels Value in pixels indicating the offset from position.
-     */
-    protected void onPageScrolled(int position, float offset, int offsetPixels) {
-        // Offset any decor views if needed - keep them on-screen at all times.
-        if (mDecorChildCount > 0) {
-            final int scrollX = getScrollX();
-            int paddingLeft = getPaddingLeft();
-            int paddingRight = getPaddingRight();
-            final int width = getWidth();
-            final int childCount = getChildCount();
-            for (int i = 0; i < childCount; i++) {
-                final View child = getChildAt(i);
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-                if (!lp.isDecor) continue;
-
-                final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
-                int childLeft = 0;
-                switch (hgrav) {
-                    default:
-                        childLeft = paddingLeft;
-                        break;
-                    case Gravity.LEFT:
-                        childLeft = paddingLeft;
-                        paddingLeft += child.getWidth();
-                        break;
-                    case Gravity.CENTER_HORIZONTAL:
-                        childLeft = Math.max((width - child.getMeasuredWidth()) / 2,
-                                paddingLeft);
-                        break;
-                    case Gravity.RIGHT:
-                        childLeft = width - paddingRight - child.getMeasuredWidth();
-                        paddingRight += child.getMeasuredWidth();
-                        break;
-                }
-                childLeft += scrollX;
-
-                final int childOffset = childLeft - child.getLeft();
-                if (childOffset != 0) {
-                    child.offsetLeftAndRight(childOffset);
-                }
-            }
-        }
-
-        if (mOnPageChangeListener != null) {
-            mOnPageChangeListener.onPageScrolled(position, offset, offsetPixels);
-        }
-        if (mInternalPageChangeListener != null) {
-            mInternalPageChangeListener.onPageScrolled(position, offset, offsetPixels);
-        }
-
-        if (mPageTransformer != null) {
-            final int scrollX = getScrollX();
-            final int childCount = getChildCount();
-            for (int i = 0; i < childCount; i++) {
-                final View child = getChildAt(i);
-                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
-
-                if (lp.isDecor) continue;
-
-                final float transformPos = (float) (child.getLeft() - scrollX) / getClientWidth();
-                mPageTransformer.transformPage(child, transformPos);
-            }
-        }
-
-        mCalledSuper = true;
-    }
-
-    private void completeScroll(boolean postEvents) {
-        boolean needPopulate = mScrollState == SCROLL_STATE_SETTLING;
-        if (needPopulate) {
-            // Done with scroll, no longer want to cache view drawing.
-            setScrollingCacheEnabled(false);
-            mScroller.abortAnimation();
-            int oldX = getScrollX();
-            int oldY = getScrollY();
-            int x = mScroller.getCurrX();
-            int y = mScroller.getCurrY();
-            if (oldX != x || oldY != y) {
-                scrollTo(x, y);
-            }
-        }
-        mPopulatePending = false;
-        for (int i=0; i<mItems.size(); i++) {
-            ItemInfo ii = mItems.get(i);
-            if (ii.scrolling) {
-                needPopulate = true;
-                ii.scrolling = false;
-            }
-        }
-        if (needPopulate) {
-            if (postEvents) {
-                ViewCompat.postOnAnimation(this, mEndScrollRunnable);
-            } else {
-                mEndScrollRunnable.run();
-            }
-        }
-    }
-
-    private boolean isGutterDrag(float x, float dx) {
-        return (x < mGutterSize && dx > 0) || (x > getWidth() - mGutterSize && dx < 0);
-    }
-
-    @SuppressLint("WrongConstant")
-    private void enableLayers(boolean enable) {
-        final int childCount = getChildCount();
-        for (int i = 0; i < childCount; i++) {
-            final int layerType = enable ?
-                    View.LAYER_TYPE_HARDWARE : View.LAYER_TYPE_NONE;
-            getChildAt(i).setLayerType(layerType, null);
-        }
-    }
-
-    @Override
-    public boolean onInterceptTouchEvent(MotionEvent ev) {
-        /*
-         * This method JUST determines whether we want to intercept the motion.
-         * If we return true, onMotionEvent will be called and we do the actual
-         * scrolling there.
-         */
-
-        final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
-
-        // Always take care of the touch gesture being complete.
-        if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
-            // Release the drag.
-            if (DEBUG) Log.v(TAG, "Intercept done!");
-            mIsBeingDragged = false;
-            mIsUnableToDrag = false;
-            mActivePointerId = INVALID_POINTER;
-            if (mVelocityTracker != null) {
-                mVelocityTracker.recycle();
-                mVelocityTracker = null;
-            }
-            return false;
-        }
-
-        // Nothing more to do here if we have decided whether or not we
-        // are dragging.
-        if (action != MotionEvent.ACTION_DOWN) {
-            if (mIsBeingDragged) {
-                if (DEBUG) Log.v(TAG, "Intercept returning true!");
-                return true;
-            }
-            if (mIsUnableToDrag) {
-                if (DEBUG) Log.v(TAG, "Intercept returning false!");
-                return false;
-            }
-        }
-
-        switch (action) {
-            case MotionEvent.ACTION_MOVE: {
-                /*
-                 * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
-                 * whether the user has moved far enough from his original down touch.
-                 */
-
-                /*
-                * Locally do absolute value. mLastMotionY is set to the y value
-                * of the down event.
-                */
-                final int activePointerId = mActivePointerId;
-                if (activePointerId == INVALID_POINTER) {
-                    // If we don't have a valid id, the touch down wasn't on content.
-                    break;
-                }
-
-                final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
-                final float x = MotionEventCompat.getX(ev, pointerIndex);
-                final float dx = x - mLastMotionX;
-                final float xDiff = Math.abs(dx);
-                final float y = MotionEventCompat.getY(ev, pointerIndex);
-                final float yDiff = Math.abs(y - mInitialMotionY);
-                if (DEBUG) Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
-
-                if (dx != 0 && !isGutterDrag(mLastMotionX, dx) &&
-                        canScroll(this, false, (int) dx, (int) x, (int) y)) {
-                    // Nested view has scrollable area under this point. Let it be handled there.
-                    mLastMotionX = x;
-                    mLastMotionY = y;
-                    mIsUnableToDrag = true;
-                    return false;
-                }
-                if (xDiff > mTouchSlop && xDiff * 0.5f > yDiff) {
-                    if (DEBUG) Log.v(TAG, "Starting drag!");
-                    mIsBeingDragged = true;
-                    requestParentDisallowInterceptTouchEvent(true);
-                    setScrollState(SCROLL_STATE_DRAGGING);
-                    mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop :
-                            mInitialMotionX - mTouchSlop;
-                    mLastMotionY = y;
-                    setScrollingCacheEnabled(true);
-                } else if (yDiff > mTouchSlop) {
-                    // The finger has moved enough in the vertical
-                    // direction to be counted as a drag...  abort
-                    // any attempt to drag horizontally, to work correctly
-                    // with children that have scrolling containers.
-                    if (DEBUG) Log.v(TAG, "Starting unable to drag!");
-                    mIsUnableToDrag = true;
-                }
-                if (mIsBeingDragged) {
-                    // Scroll to follow the motion event
-                    if (performDrag(x)) {
-                        ViewCompat.postInvalidateOnAnimation(this);
-                    }
-                }
-                break;
-            }
-
-            case MotionEvent.ACTION_DOWN: {
-                /*
-                 * Remember location of down touch.
-                 * ACTION_DOWN always refers to pointer index 0.
-                 */
-                mLastMotionX = mInitialMotionX = ev.getX();
-                mLastMotionY = mInitialMotionY = ev.getY();
-                mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
-                mIsUnableToDrag = false;
-
-                mScroller.computeScrollOffset();
-                if (mScrollState == SCROLL_STATE_SETTLING &&
-                        Math.abs(mScroller.getFinalX() - mScroller.getCurrX()) > mCloseEnough) {
-                    // Let the user 'catch' the pager as it animates.
-                    mScroller.abortAnimation();
-                    mPopulatePending = false;
-                    populate();
-                    mIsBeingDragged = true;
-                    requestParentDisallowInterceptTouchEvent(true);
-                    setScrollState(SCROLL_STATE_DRAGGING);
-                } else {
-                    completeScroll(false);
-                    mIsBeingDragged = false;
-                }
-
-                if (DEBUG) Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY
-                        + " mIsBeingDragged=" + mIsBeingDragged
-                        + "mIsUnableToDrag=" + mIsUnableToDrag);
-                break;
-            }
-
-            case MotionEventCompat.ACTION_POINTER_UP:
-                onSecondaryPointerUp(ev);
-                break;
-        }
-
-        if (mVelocityTracker == null) {
-            mVelocityTracker = VelocityTracker.obtain();
-        }
-        mVelocityTracker.addMovement(ev);
-
-        /*
-         * The only time we want to intercept motion events is if we are in the
-         * drag mode.
-         */
-        return mIsBeingDragged;
-    }
-
-    @Override
-    public boolean onTouchEvent(MotionEvent ev) {
-        if (mFakeDragging) {
-            // A fake drag is in progress already, ignore this real one
-            // but still eat the touch events.
-            // (It is likely that the user is multi-touching the screen.)
-            return true;
-        }
-
-        if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
-            // Don't handle edge touches immediately -- they may actually belong to one of our
-            // descendants.
-            return false;
-        }
-
-        if (mAdapter == null || mAdapter.getCount() == 0) {
-            // Nothing to present or scroll; nothing to touch.
-            return false;
-        }
-
-        if (mVelocityTracker == null) {
-            mVelocityTracker = VelocityTracker.obtain();
-        }
-        mVelocityTracker.addMovement(ev);
-
-        final int action = ev.getAction();
-        boolean needsInvalidate = false;
-
-        switch (action & MotionEventCompat.ACTION_MASK) {
-            case MotionEvent.ACTION_DOWN: {
-                mScroller.abortAnimation();
-                mPopulatePending = false;
-                populate();
-
-                // Remember where the motion event started
-                mLastMotionX = mInitialMotionX = ev.getX();
-                mLastMotionY = mInitialMotionY = ev.getY();
-                mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
-                break;
-            }
-            case MotionEvent.ACTION_MOVE:
-                if (!mIsBeingDragged) {
-                    final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
-                    final float x = MotionEventCompat.getX(ev, pointerIndex);
-                    final float xDiff = Math.abs(x - mLastMotionX);
-                    final float y = MotionEventCompat.getY(ev, pointerIndex);
-                    final float yDiff = Math.abs(y - mLastMotionY);
-                    if (DEBUG) Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
-                    if (xDiff > mTouchSlop && xDiff > yDiff) {
-                        if (DEBUG) Log.v(TAG, "Starting drag!");
-                        mIsBeingDragged = true;
-                        requestParentDisallowInterceptTouchEvent(true);
-                        mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop :
-                                mInitialMotionX - mTouchSlop;
-                        mLastMotionY = y;
-                        setScrollState(SCROLL_STATE_DRAGGING);
-                        setScrollingCacheEnabled(true);
-
-                        // Disallow Parent Intercept, just in case
-                        ViewParent parent = getParent();
-                        if (parent != null) {
-                            parent.requestDisallowInterceptTouchEvent(true);
-                        }
-                    }
-                }
-                // Not else! Note that mIsBeingDragged can be set above.
-                if (mIsBeingDragged) {
-                    // Scroll to follow the motion event
-                    final int activePointerIndex = MotionEventCompat.findPointerIndex(
-                            ev, mActivePointerId);
-                    final float x = MotionEventCompat.getX(ev, activePointerIndex);
-                    needsInvalidate |= performDrag(x);
-                }
-                break;
-            case MotionEvent.ACTION_UP:
-                if (mIsBeingDragged) {
-                    final VelocityTracker velocityTracker = mVelocityTracker;
-                    velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
-                    int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(
-                            velocityTracker, mActivePointerId);
-                    mPopulatePending = true;
-                    final int width = getClientWidth();
-                    final int scrollX = getScrollX();
-                    final ItemInfo ii = infoForCurrentScrollPosition();
-                    final int currentPage = ii.position;
-                    final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
-                    final int activePointerIndex =
-                            MotionEventCompat.findPointerIndex(ev, mActivePointerId);
-                    final float x = MotionEventCompat.getX(ev, activePointerIndex);
-                    final int totalDelta = (int) (x - mInitialMotionX);
-                    int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
-                            totalDelta);
-                    setCurrentItemInternal(nextPage, true, true, initialVelocity);
-
-                    mActivePointerId = INVALID_POINTER;
-                    endDrag();
-                    needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
-                }
-                break;
-            case MotionEvent.ACTION_CANCEL:
-                if (mIsBeingDragged) {
-                    scrollToItem(mCurItem, true, 0, false);
-                    mActivePointerId = INVALID_POINTER;
-                    endDrag();
-                    needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
-                }
-                break;
-            case MotionEventCompat.ACTION_POINTER_DOWN: {
-                final int index = MotionEventCompat.getActionIndex(ev);
-                final float x = MotionEventCompat.getX(ev, index);
-                mLastMotionX = x;
-                mActivePointerId = MotionEventCompat.getPointerId(ev, index);
-                break;
-            }
-            case MotionEventCompat.ACTION_POINTER_UP:
-                onSecondaryPointerUp(ev);
-                mLastMotionX = MotionEventCompat.getX(ev,
-                        MotionEventCompat.findPointerIndex(ev, mActivePointerId));
-                break;
-        }
-        if (needsInvalidate) {
-            ViewCompat.postInvalidateOnAnimation(this);
-        }
-        return true;
-    }
-
-    private void requestParentDisallowInterceptTouchEvent(boolean disallowIntercept) {
-        final ViewParent parent = getParent();
-        if (parent != null) {
-            parent.requestDisallowInterceptTouchEvent(disallowIntercept);
-        }
-    }
-
-    private boolean performDrag(float x) {
-        boolean needsInvalidate = false;
-
-        final float deltaX = mLastMotionX - x;
-        mLastMotionX = x;
-
-        float oldScrollX = getScrollX();
-        float scrollX = oldScrollX + deltaX;
-        final int width = getClientWidth();
-
-        float leftBound = width * mFirstOffset;
-        float rightBound = width * mLastOffset;
-        boolean leftAbsolute = true;
-        boolean rightAbsolute = true;
-
-        final ItemInfo firstItem = mItems.get(0);
-        final ItemInfo lastItem = mItems.get(mItems.size() - 1);
-        if (firstItem.position != 0) {
-            leftAbsolute = false;
-            leftBound = firstItem.offset * width;
-        }
-        if (lastItem.position != mAdapter.getCount() - 1) {
-            rightAbsolute = false;
-            rightBound = lastItem.offset * width;
-        }
-
-        if (scrollX < leftBound) {
-            if (leftAbsolute) {
-                float over = leftBound - scrollX;
-                needsInvalidate = mLeftEdge.onPull(Math.abs(over) / width);
-            }
-            scrollX = leftBound;
-        } else if (scrollX > rightBound) {
-            if (rightAbsolute) {
-                float over = scrollX - rightBound;
-                needsInvalidate = mRightEdge.onPull(Math.abs(over) / width);
-            }
-            scrollX = rightBound;
-        }
-        // Don't lose the rounded component
-        mLastMotionX += scrollX - (int) scrollX;
-        scrollTo((int) scrollX, getScrollY());
-        pageScrolled((int) scrollX);
-
-        return needsInvalidate;
-    }
-
-    /**
-     * @return Info about the page at the current scroll position.
-     *         This can be synthetic for a missing middle page; the 'object' field can be null.
-     */
-    private ItemInfo infoForCurrentScrollPosition() {
-        final int width = getClientWidth();
-        final float scrollOffset = width > 0 ? (float) getScrollX() / width : 0;
-        final float marginOffset = width > 0 ? (float) mPageMargin / width : 0;
-        int lastPos = -1;
-        float lastOffset = 0.f;
-        float lastWidth = 0.f;
-        boolean first = true;
-
-        ItemInfo lastItem = null;
-        for (int i = 0; i < mItems.size(); i++) {
-            ItemInfo ii = mItems.get(i);
-            float offset;
-            if (!first && ii.position != lastPos + 1) {
-                // Create a synthetic item for a missing page.
-                ii = mTempItem;
-                ii.offset = lastOffset + lastWidth + marginOffset;
-                ii.position = lastPos + 1;
-                ii.widthFactor = mAdapter.getPageWidth(ii.position);
-                i--;
-            }
-            offset = ii.offset;
-
-            final float leftBound = offset;
-            final float rightBound = offset + ii.widthFactor + marginOffset;
-            if (first || scrollOffset >= leftBound) {
-                if (scrollOffset < rightBound || i == mItems.size() - 1) {
-                    return ii;
-                }
-            } else {
-                return lastItem;
-            }
-            first = false;
-            lastPos = ii.position;
-            lastOffset = offset;
-            lastWidth = ii.widthFactor;
-            lastItem = ii;
-        }
-
-        return lastItem;
-    }
-
-    private int determineTargetPage(int currentPage, float pageOffset, int velocity, int deltaX) {
-        int targetPage;
-        if (Math.abs(deltaX) > mFlingDistance && Math.abs(velocity) > mMinimumVelocity) {
-            targetPage = velocity > 0 ? currentPage : currentPage + 1;
-        } else {
-            final float truncator = currentPage >= mCurItem ? 0.4f : 0.6f;
-            targetPage = (int) (currentPage + pageOffset + truncator);
-        }
-
-        if (mItems.size() > 0) {
-            final ItemInfo firstItem = mItems.get(0);
-            final ItemInfo lastItem = mItems.get(mItems.size() - 1);
-
-            // Only let the user target pages we have items for
-            targetPage = Math.max(firstItem.position, Math.min(targetPage, lastItem.position));
-        }
-
-        return targetPage;
-    }
-
-    @Override
-    public void draw(Canvas canvas) {
-        super.draw(canvas);
-        boolean needsInvalidate = false;
-
-        final int overScrollMode = ViewCompat.getOverScrollMode(this);
-        if (overScrollMode == ViewCompat.OVER_SCROLL_ALWAYS ||
-                (overScrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS &&
-                        mAdapter != null && mAdapter.getCount() > 1)) {
-            if (!mLeftEdge.isFinished()) {
-                final int restoreCount = canvas.save();
-                final int height = getHeight() - getPaddingTop() - getPaddingBottom();
-                final int width = getWidth();
-
-                canvas.rotate(270);
-                canvas.translate(-height + getPaddingTop(), mFirstOffset * width);
-                mLeftEdge.setSize(height, width);
-                needsInvalidate |= mLeftEdge.draw(canvas);
-                canvas.restoreToCount(restoreCount);
-            }
-            if (!mRightEdge.isFinished()) {
-                final int restoreCount = canvas.save();
-                final int width = getWidth();
-                final int height = getHeight() - getPaddingTop() - getPaddingBottom();
-
-                canvas.rotate(90);
-                canvas.translate(-getPaddingTop(), -(mLastOffset + 1) * width);
-                mRightEdge.setSize(height, width);
-                needsInvalidate |= mRightEdge.draw(canvas);
-                canvas.restoreToCount(restoreCount);
-            }
-        } else {
-            mLeftEdge.finish();
-            mRightEdge.finish();
-        }
-
-        if (needsInvalidate) {
-            // Keep animating
-            ViewCompat.postInvalidateOnAnimation(this);
-        }
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        super.onDraw(canvas);
-
-        // Draw the margin drawable between pages if needed.
-        if (mPageMargin > 0 && mMarginDrawable != null && mItems.size() > 0 && mAdapter != null) {
-            final int scrollX = getScrollX();
-            final int width = getWidth();
-
-            final float marginOffset = (float) mPageMargin / width;
-            int itemIndex = 0;
-            ItemInfo ii = mItems.get(0);
-            float offset = ii.offset;
-            final int itemCount = mItems.size();
-            final int firstPos = ii.position;
-            final int lastPos = mItems.get(itemCount - 1).position;
-            for (int pos = firstPos; pos < lastPos; pos++) {
-                while (pos > ii.position && itemIndex < itemCount) {
-                    ii = mItems.get(++itemIndex);
-                }
-
-                float drawAt;
-                if (pos == ii.position) {
-                    drawAt = (ii.offset + ii.widthFactor) * width;
-                    offset = ii.offset + ii.widthFactor + marginOffset;
-                } else {
-                    float widthFactor = mAdapter.getPageWidth(pos);
-                    drawAt = (offset + widthFactor) * width;
-                    offset += widthFactor + marginOffset;
-                }
-
-                if (drawAt + mPageMargin > scrollX) {
-                    mMarginDrawable.setBounds((int) drawAt, mTopPageBounds,
-                            (int) (drawAt + mPageMargin + 0.5f), mBottomPageBounds);
-                    mMarginDrawable.draw(canvas);
-                }
-
-                if (drawAt > scrollX + width) {
-                    break; // No more visible, no sense in continuing
-                }
-            }
-        }
-    }
-
-    /**
-     * Start a fake drag of the pager.
-     *
-     * <p>A fake drag can be useful if you want to synchronize the motion of the ViewPager
-     * with the touch scrolling of another view, while still letting the ViewPager
-     * control the snapping motion and fling behavior. (e.g. parallax-scrolling tabs.)
-     * Call {@link #fakeDragBy(float)} to simulate the actual drag motion. Call
-     * {@link #endFakeDrag()} to complete the fake drag and fling as necessary.
-     *
-     * <p>During a fake drag the ViewPager will ignore all touch events. If a real drag
-     * is already in progress, this method will return false.
-     *
-     * @return true if the fake drag began successfully, false if it could not be started.
-     *
-     * @see #fakeDragBy(float)
-     * @see #endFakeDrag()
-     */
-    public boolean beginFakeDrag() {
-        if (mIsBeingDragged) {
-            return false;
-        }
-        mFakeDragging = true;
-        setScrollState(SCROLL_STATE_DRAGGING);
-        mInitialMotionX = mLastMotionX = 0;
-        if (mVelocityTracker == null) {
-            mVelocityTracker = VelocityTracker.obtain();
-        } else {
-            mVelocityTracker.clear();
-        }
-        final long time = SystemClock.uptimeMillis();
-        final MotionEvent ev = MotionEvent.obtain(time, time, MotionEvent.ACTION_DOWN, 0, 0, 0);
-        mVelocityTracker.addMovement(ev);
-        ev.recycle();
-        mFakeDragBeginTime = time;
-        return true;
-    }
-
-    /**
-     * End a fake drag of the pager.
-     *
-     * @see #beginFakeDrag()
-     * @see #fakeDragBy(float)
-     */
-    public void endFakeDrag() {
-        if (!mFakeDragging) {
-            throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
-        }
-
-        final VelocityTracker velocityTracker = mVelocityTracker;
-        velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
-        int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(
-                velocityTracker, mActivePointerId);
-        mPopulatePending = true;
-        final int width = getClientWidth();
-        final int scrollX = getScrollX();
-        final ItemInfo ii = infoForCurrentScrollPosition();
-        final int currentPage = ii.position;
-        final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
-        final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
-        int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
-                totalDelta);
-        setCurrentItemInternal(nextPage, true, true, initialVelocity);
-        endDrag();
-
-        mFakeDragging = false;
-    }
-
-    /**
-     * Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
-     *
-     * @param xOffset Offset in pixels to drag by.
-     * @see #beginFakeDrag()
-     * @see #endFakeDrag()
-     */
-    public void fakeDragBy(float xOffset) {
-        if (!mFakeDragging) {
-            throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
-        }
-
-        mLastMotionX += xOffset;
-
-        float oldScrollX = getScrollX();
-        float scrollX = oldScrollX - xOffset;
-        final int width = getClientWidth();
-
-        float leftBound = width * mFirstOffset;
-        float rightBound = width * mLastOffset;
-
-        final ItemInfo firstItem = mItems.get(0);
-        final ItemInfo lastItem = mItems.get(mItems.size() - 1);
-        if (firstItem.position != 0) {
-            leftBound = firstItem.offset * width;
-        }
-        if (lastItem.position != mAdapter.getCount() - 1) {
-            rightBound = lastItem.offset * width;
-        }
-
-        if (scrollX < leftBound) {
-            scrollX = leftBound;
-        } else if (scrollX > rightBound) {
-            scrollX = rightBound;
-        }
-        // Don't lose the rounded component
-        mLastMotionX += scrollX - (int) scrollX;
-        scrollTo((int) scrollX, getScrollY());
-        pageScrolled((int) scrollX);
-
-        // Synthesize an event for the VelocityTracker.
-        final long time = SystemClock.uptimeMillis();
-        final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
-                mLastMotionX, 0, 0);
-        mVelocityTracker.addMovement(ev);
-        ev.recycle();
-    }
-
-    /**
-     * Returns true if a fake drag is in progress.
-     *
-     * @return true if currently in a fake drag, false otherwise.
-     *
-     * @see #beginFakeDrag()
-     * @see #fakeDragBy(float)
-     * @see #endFakeDrag()
-     */
-    public boolean isFakeDragging() {
-        return mFakeDragging;
-    }
-
-    private void onSecondaryPointerUp(MotionEvent ev) {
-        final int pointerIndex = MotionEventCompat.getActionIndex(ev);
-        final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
-        if (pointerId == mActivePointerId) {
-            // This was our active pointer going up. Choose a new
-            // active pointer and adjust accordingly.
-            final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
-            mLastMotionX = MotionEventCompat.getX(ev, newPointerIndex);
-            mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
-            if (mVelocityTracker != null) {
-                mVelocityTracker.clear();
-            }
-        }
-    }
-
-    private void endDrag() {
-        mIsBeingDragged = false;
-        mIsUnableToDrag = false;
-
-        if (mVelocityTracker != null) {
-            mVelocityTracker.recycle();
-            mVelocityTracker = null;
-        }
-    }
-
-    private void setScrollingCacheEnabled(boolean enabled) {
-        if (mScrollingCacheEnabled != enabled) {
-            mScrollingCacheEnabled = enabled;
-            if (USE_CACHE) {
-                final int size = getChildCount();
-                for (int i = 0; i < size; ++i) {
-                    final View child = getChildAt(i);
-                    if (child.getVisibility() != GONE) {
-                        child.setDrawingCacheEnabled(enabled);
-                    }
-                }
-            }
-        }
-    }
-
-    public boolean canScrollHorizontally(int direction) {
-        if (mAdapter == null) {
-            return false;
-        }
-
-        final int width = getClientWidth();
-        final int scrollX = getScrollX();
-        if (direction < 0) {
-            return (scrollX > (int) (width * mFirstOffset));
-        } else if (direction > 0) {
-            return (scrollX < (int) (width * mLastOffset));
-        } else {
-            return false;
-        }
-    }
-
-    /**
-     * Tests scrollability within child views of v given a delta of dx.
-     *
-     * @param v View to test for horizontal scrollability
-     * @param checkV Whether the view v passed should itself be checked for scrollability (true),
-     *               or just its children (false).
-     * @param dx Delta scrolled in pixels
-     * @param x X coordinate of the active touch point
-     * @param y Y coordinate of the active touch point
-     * @return true if child views of v can be scrolled by delta of dx.
-     */
-    protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
-        if (v instanceof ViewGroup) {
-            final ViewGroup group = (ViewGroup) v;
-            final int scrollX = v.getScrollX();
-            final int scrollY = v.getScrollY();
-            final int count = group.getChildCount();
-            // Count backwards - let topmost views consume scroll distance first.
-            for (int i = count - 1; i >= 0; i--) {
-                // TODO: Add versioned support here for transformed views.
-                // This will not work for transformed views in Honeycomb+
-                final View child = group.getChildAt(i);
-                if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() &&
-                        y + scrollY >= child.getTop() && y + scrollY < child.getBottom() &&
-                        canScroll(child, true, dx, x + scrollX - child.getLeft(),
-                                y + scrollY - child.getTop())) {
-                    return true;
-                }
-            }
-        }
-
-        return checkV && ViewCompat.canScrollHorizontally(v, -dx);
-    }
-
-    @Override
-    public boolean dispatchKeyEvent(KeyEvent event) {
-        // Let the focused view and/or our descendants get the key first
-        return super.dispatchKeyEvent(event) || executeKeyEvent(event);
-    }
-
-    /**
-     * You can call this function yourself to have the scroll view perform
-     * scrolling from a key event, just as if the event had been dispatched to
-     * it by the view hierarchy.
-     *
-     * @param event The key event to execute.
-     * @return Return true if the event was handled, else false.
-     */
-    public boolean executeKeyEvent(KeyEvent event) {
-        boolean handled = false;
-        if (event.getAction() == KeyEvent.ACTION_DOWN) {
-            switch (event.getKeyCode()) {
-                case KeyEvent.KEYCODE_DPAD_LEFT:
-                    handled = arrowScroll(FOCUS_LEFT);
-                    break;
-                case KeyEvent.KEYCODE_DPAD_RIGHT:
-                    handled = arrowScroll(FOCUS_RIGHT);
-                    break;
-            }
-        }
-        return handled;
-    }
-
-    public boolean arrowScroll(int direction) {
-        View currentFocused = findFocus();
-        if (currentFocused == this) {
-            currentFocused = null;
-        } else if (currentFocused != null) {
-            boolean isChild = false;
-            for (ViewParent parent = currentFocused.getParent(); parent instanceof ViewGroup;
-                    parent = parent.getParent()) {
-                if (parent == this) {
-                    isChild = true;
-                    break;
-                }
-            }
-            if (!isChild) {
-                // This would cause the focus search down below to fail in fun ways.
-                final StringBuilder sb = new StringBuilder();
-                sb.append(currentFocused.getClass().getSimpleName());
-                for (ViewParent parent = currentFocused.getParent(); parent instanceof ViewGroup;
-                        parent = parent.getParent()) {
-                    sb.append(" => ").append(parent.getClass().getSimpleName());
-                }
-                Log.e(TAG, "arrowScroll tried to find focus based on non-child " +
-                        "current focused view " + sb.toString());
-                currentFocused = null;
-            }
-        }
-
-        boolean handled = false;
-
-        View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused,
-                direction);
-        if (nextFocused != null && nextFocused != currentFocused) {
-            if (direction == View.FOCUS_LEFT) {
-                // If there is nothing to the left, or this is causing us to
-                // jump to the right, then what we really want to do is page left.
-                final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left;
-                final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left;
-                if (currentFocused != null && nextLeft >= currLeft) {
-                    handled = pageLeft();
-                } else {
-                    handled = nextFocused.requestFocus();
-                }
-            } else if (direction == View.FOCUS_RIGHT) {
-                // If there is nothing to the right, or this is causing us to
-                // jump to the left, then what we really want to do is page right.
-                final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left;
-                final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left;
-                if (currentFocused != null && nextLeft <= currLeft) {
-                    handled = pageRight();
-                } else {
-                    handled = nextFocused.requestFocus();
-                }
-            }
-        } else if (direction == FOCUS_LEFT || direction == FOCUS_BACKWARD) {
-            // Trying to move left and nothing there; try to page.
-            handled = pageLeft();
-        } else if (direction == FOCUS_RIGHT || direction == FOCUS_FORWARD) {
-            // Trying to move right and nothing there; try to page.
-            handled = pageRight();
-        }
-        if (handled) {
-            playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction));
-        }
-        return handled;
-    }
-
-    private Rect getChildRectInPagerCoordinates(Rect outRect, View child) {
-        if (outRect == null) {
-            outRect = new Rect();
-        }
-        if (child == null) {
-            outRect.set(0, 0, 0, 0);
-            return outRect;
-        }
-        outRect.left = child.getLeft();
-        outRect.right = child.getRight();
-        outRect.top = child.getTop();
-        outRect.bottom = child.getBottom();
-
-        ViewParent parent = child.getParent();
-        while (parent instanceof ViewGroup && parent != this) {
-            final ViewGroup group = (ViewGroup) parent;
-            outRect.left += group.getLeft();
-            outRect.right += group.getRight();
-            outRect.top += group.getTop();
-            outRect.bottom += group.getBottom();
-
-            parent = group.getParent();
-        }
-        return outRect;
-    }
-
-    boolean pageLeft() {
-        if (mCurItem > 0) {
-            setCurrentItem(mCurItem-1, true);
-            return true;
-        }
-        return false;
-    }
-
-    boolean pageRight() {
-        if (mAdapter != null && mCurItem < (mAdapter.getCount()-1)) {
-            setCurrentItem(mCurItem+1, true);
-            return true;
-        }
-        return false;
-    }
-
-    /**
-     * We only want the current page that is being shown to be focusable.
-     */
-    @Override
-    public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
-        final int focusableCount = views.size();
-
-        final int descendantFocusability = getDescendantFocusability();
-
-        if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) {
-            for (int i = 0; i < getChildCount(); i++) {
-                final View child = getChildAt(i);
-                if (child.getVisibility() == VISIBLE) {
-                    ItemInfo ii = infoForChild(child);
-                    if (ii != null && ii.position == mCurItem) {
-                        child.addFocusables(views, direction, focusableMode);
-                    }
-                }
-            }
-        }
-
-        // we add ourselves (if focusable) in all cases except for when we are
-        // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable.  this is
-        // to avoid the focus search finding layouts when a more precise search
-        // among the focusable children would be more interesting.
-        if (
-            descendantFocusability != FOCUS_AFTER_DESCENDANTS ||
-                // No focusable descendants
-                (focusableCount == views.size())) {
-            // Note that we can't call the superclass here, because it will
-            // add all views in.  So we need to do the same thing View does.
-            if (!isFocusable()) {
-                return;
-            }
-            if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE &&
-                    isInTouchMode() && !isFocusableInTouchMode()) {
-                return;
-            }
-            if (views != null) {
-                views.add(this);
-            }
-        }
-    }
-
-    /**
-     * We only want the current page that is being shown to be touchable.
-     */
-    @Override
-    public void addTouchables(ArrayList<View> views) {
-        // Note that we don't call super.addTouchables(), which means that
-        // we don't call View.addTouchables().  This is okay because a ViewPager
-        // is itself not touchable.
-        for (int i = 0; i < getChildCount(); i++) {
-            final View child = getChildAt(i);
-            if (child.getVisibility() == VISIBLE) {
-                ItemInfo ii = infoForChild(child);
-                if (ii != null && ii.position == mCurItem) {
-                    child.addTouchables(views);
-                }
-            }
-        }
-    }
-
-    /**
-     * We only want the current page that is being shown to be focusable.
-     */
-    @Override
-    protected boolean onRequestFocusInDescendants(int direction,
-            Rect previouslyFocusedRect) {
-        int index;
-        int increment;
-        int end;
-        int count = getChildCount();
-        if ((direction & FOCUS_FORWARD) != 0) {
-            index = 0;
-            increment = 1;
-            end = count;
-        } else {
-            index = count - 1;
-            increment = -1;
-            end = -1;
-        }
-        for (int i = index; i != end; i += increment) {
-            View child = getChildAt(i);
-            if (child.getVisibility() == VISIBLE) {
-                ItemInfo ii = infoForChild(child);
-                if (ii != null && ii.position == mCurItem) {
-                    if (child.requestFocus(direction, previouslyFocusedRect)) {
-                        return true;
-                    }
-                }
-            }
-        }
-        return false;
-    }
-
-    @Override
-    public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
-        // Dispatch scroll events from this ViewPager.
-        if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
-            return super.dispatchPopulateAccessibilityEvent(event);
-        }
-
-        // Dispatch all other accessibility events from the current page.
-        final int childCount = getChildCount();
-        for (int i = 0; i < childCount; i++) {
-            final View child = getChildAt(i);
-            if (child.getVisibility() == VISIBLE) {
-                final ItemInfo ii = infoForChild(child);
-                if (ii != null && ii.position == mCurItem &&
-                        child.dispatchPopulateAccessibilityEvent(event)) {
-                    return true;
-                }
-            }
-        }
-
-        return false;
-    }
-
-    @Override
-    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
-        return new LayoutParams();
-    }
-
-    @Override
-    protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
-        return generateDefaultLayoutParams();
-    }
-
-    @Override
-    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
-        return p instanceof LayoutParams && super.checkLayoutParams(p);
-    }
-
-    @Override
-    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
-        return new LayoutParams(getContext(), attrs);
-    }
-
-    class MyAccessibilityDelegate extends AccessibilityDelegateCompat {
-
-        @Override
-        public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
-            super.onInitializeAccessibilityEvent(host, event);
-            event.setClassName(ViewPager.class.getName());
-            final AccessibilityRecordCompat recordCompat = AccessibilityRecordCompat.obtain();
-            recordCompat.setScrollable(canScroll());
-            if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED
-                    && mAdapter != null) {
-                recordCompat.setItemCount(mAdapter.getCount());
-                recordCompat.setFromIndex(mCurItem);
-                recordCompat.setToIndex(mCurItem);
-            }
-        }
-
-        @Override
-        public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
-            super.onInitializeAccessibilityNodeInfo(host, info);
-            info.setClassName(ViewPager.class.getName());
-            info.setScrollable(canScroll());
-            if (canScrollHorizontally(1)) {
-                info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD);
-            }
-            if (canScrollHorizontally(-1)) {
-                info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD);
-            }
-        }
-
-        @Override
-        public boolean performAccessibilityAction(View host, int action, Bundle args) {
-            if (super.performAccessibilityAction(host, action, args)) {
-                return true;
-            }
-            switch (action) {
-                case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: {
-                    if (canScrollHorizontally(1)) {
-                        setCurrentItem(mCurItem + 1);
-                        return true;
-                    }
-                } return false;
-                case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: {
-                    if (canScrollHorizontally(-1)) {
-                        setCurrentItem(mCurItem - 1);
-                        return true;
-                    }
-                } return false;
-            }
-            return false;
-        }
-
-        private boolean canScroll() {
-            return (mAdapter != null) && (mAdapter.getCount() > 1);
-        }
-    }
-
-    private class PagerObserver extends DataSetObserver {
-        @Override
-        public void onChanged() {
-            dataSetChanged();
-        }
-        @Override
-        public void onInvalidated() {
-            dataSetChanged();
-        }
-    }
-
-    /**
-     * Layout parameters that should be supplied for views added to a
-     * ViewPager.
-     */
-    public static class LayoutParams extends ViewGroup.LayoutParams {
-        /**
-         * true if this view is a decoration on the pager itself and not
-         * a view supplied by the adapter.
-         */
-        public boolean isDecor;
-
-        /**
-         * Gravity setting for use on decor views only:
-         * Where to position the view page within the overall ViewPager
-         * container; constants are defined in {@link android.view.Gravity}.
-         */
-        public int gravity;
-
-        /**
-         * Width as a 0-1 multiplier of the measured pager width
-         */
-        float widthFactor = 0.f;
-
-        /**
-         * true if this view was added during layout and needs to be measured
-         * before being positioned.
-         */
-        boolean needsMeasure;
-
-        /**
-         * Adapter position this view is for if !isDecor
-         */
-        int position;
-
-        /**
-         * Current child index within the ViewPager that this view occupies
-         */
-        int childIndex;
-
-        public LayoutParams() {
-            super(FILL_PARENT, FILL_PARENT);
-        }
-
-        public LayoutParams(Context context, AttributeSet attrs) {
-            super(context, attrs);
-
-            final TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS);
-            gravity = a.getInteger(0, Gravity.TOP);
-            a.recycle();
-        }
-    }
-
-    static class ViewPositionComparator implements Comparator<View> {
-        @Override
-        public int compare(View lhs, View rhs) {
-            final LayoutParams llp = (LayoutParams) lhs.getLayoutParams();
-            final LayoutParams rlp = (LayoutParams) rhs.getLayoutParams();
-            if (llp.isDecor != rlp.isDecor) {
-                return llp.isDecor ? 1 : -1;
-            }
-            return llp.position - rlp.position;
-        }
-    }
-}
diff --git a/main/src/ui/java/de/blinkt/openvpn/activities/BaseActivity.java b/main/src/ui/java/de/blinkt/openvpn/activities/BaseActivity.java
index 7258d8d6..68dd137e 100644
--- a/main/src/ui/java/de/blinkt/openvpn/activities/BaseActivity.java
+++ b/main/src/ui/java/de/blinkt/openvpn/activities/BaseActivity.java
@@ -5,21 +5,18 @@
 
 package de.blinkt.openvpn.activities;
 
-import android.annotation.TargetApi;
-import android.app.Activity;
 import android.app.UiModeManager;
-import android.content.Context;
-import android.content.RestrictionsManager;
 import android.content.res.Configuration;
-import android.os.Build;
 import android.os.Bundle;
-import android.os.UserManager;
 import android.view.Window;
-import de.blinkt.openvpn.api.AppRestrictions;
 
-public class BaseActivity extends Activity {
+import androidx.appcompat.app.AppCompatActivity;
+
+public abstract class BaseActivity extends AppCompatActivity {
     private boolean isAndroidTV() {
-        final UiModeManager uiModeManager = (UiModeManager) getSystemService(Activity.UI_MODE_SERVICE);
+        final UiModeManager uiModeManager = (UiModeManager) getSystemService(UI_MODE_SERVICE);
+        if (uiModeManager == null)
+            return false;
         return uiModeManager.getCurrentModeType() == Configuration.UI_MODE_TYPE_TELEVISION;
     }
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/activities/ConfigConverter.kt b/main/src/ui/java/de/blinkt/openvpn/activities/ConfigConverter.kt
index 672ffae6..b2a76f3d 100644
--- a/main/src/ui/java/de/blinkt/openvpn/activities/ConfigConverter.kt
+++ b/main/src/ui/java/de/blinkt/openvpn/activities/ConfigConverter.kt
@@ -154,7 +154,7 @@ class ConfigConverter : BaseActivity(), FileSelectCallback, View.OnClickListener
         outState.putParcelable("mSourceUri", mSourceUri)
     }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, result: Intent) {
+    override fun onActivityResult(requestCode: Int, resultCode: Int, result: Intent?) {
         if (requestCode == RESULT_INSTALLPKCS12 && resultCode == Activity.RESULT_OK) {
             showCertDialog()
         }
@@ -593,8 +593,6 @@ class ConfigConverter : BaseActivity(), FileSelectCallback, View.OnClickListener
         }
 
 
-        val intent = intent
-
         if (intent != null) {
             doImportIntent(intent)
 
@@ -607,6 +605,7 @@ class ConfigConverter : BaseActivity(), FileSelectCallback, View.OnClickListener
 
     private fun doImportIntent(intent: Intent) {
         val data = intent.data
+        if (intent.action.equals(IMPORT_PROFILE_DATA))
         if (data != null) {
             mSourceUri = data
             doImportUri(data)
@@ -698,7 +697,7 @@ class ConfigConverter : BaseActivity(), FileSelectCallback, View.OnClickListener
                     mResult!!.mName = getUniqueProfileName(possibleName)
                     mProfilename.visibility = View.VISIBLE
                     mProfilenameLabel.visibility = View.VISIBLE
-                    mProfilename!!.setText(mResult!!.name)
+                    mProfilename.setText(mResult!!.name)
 
                     log(R.string.import_done)
                 }
@@ -785,6 +784,7 @@ class ConfigConverter : BaseActivity(), FileSelectCallback, View.OnClickListener
 
     companion object {
 
+        @kotlin.jvm.JvmField
         val IMPORT_PROFILE = "de.blinkt.openvpn.IMPORT_PROFILE"
         val IMPORT_PROFILE_DATA = "de.blinkt.openvpn.IMPORT_PROFILE_DATA"
         private val RESULT_INSTALLPKCS12 = 7
diff --git a/main/src/ui/java/de/blinkt/openvpn/activities/LogWindow.java b/main/src/ui/java/de/blinkt/openvpn/activities/LogWindow.java
index db70eca9..fa0106a9 100644
--- a/main/src/ui/java/de/blinkt/openvpn/activities/LogWindow.java
+++ b/main/src/ui/java/de/blinkt/openvpn/activities/LogWindow.java
@@ -23,7 +23,7 @@ public class LogWindow extends BaseActivity {
         getActionBar().setDisplayHomeAsUpEnabled(true);
 
         if (savedInstanceState == null) {
-            getFragmentManager().beginTransaction()
+            getSupportFragmentManager().beginTransaction()
                     .add(R.id.container, new LogFragment())
                     .commit();
         }
diff --git a/main/src/ui/java/de/blinkt/openvpn/activities/MainActivity.java b/main/src/ui/java/de/blinkt/openvpn/activities/MainActivity.java
index f7c46d01..2a6a0fff 100644
--- a/main/src/ui/java/de/blinkt/openvpn/activities/MainActivity.java
+++ b/main/src/ui/java/de/blinkt/openvpn/activities/MainActivity.java
@@ -6,19 +6,14 @@
 package de.blinkt.openvpn.activities;
 
 import android.annotation.TargetApi;
-import android.app.ActionBar;
-import android.app.Activity;
-import android.content.Context;
 import android.content.Intent;
-import android.content.pm.PackageManager;
-import android.net.Uri;
 import android.os.Build;
-import android.os.PowerManager;
-import android.provider.Settings;
-import android.support.v4n.view.ViewPager;
 import android.view.Menu;
 import android.view.MenuItem;
 
+import androidx.appcompat.app.ActionBar;
+import androidx.viewpager.widget.ViewPager;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.fragments.AboutFragment;
 import de.blinkt.openvpn.fragments.FaqFragment;
@@ -28,16 +23,13 @@ import de.blinkt.openvpn.fragments.LogFragment;
 import de.blinkt.openvpn.fragments.SendDumpFragment;
 import de.blinkt.openvpn.fragments.VPNProfileList;
 import de.blinkt.openvpn.views.ScreenSlidePagerAdapter;
-import de.blinkt.openvpn.views.SlidingTabLayout;
-import de.blinkt.openvpn.views.TabBarView;
 
 
 public class MainActivity extends BaseActivity {
 
     private ViewPager mPager;
     private ScreenSlidePagerAdapter mPagerAdapter;
-    private SlidingTabLayout mSlidingTabLayout;
-    private TabBarView mTabs;
+    //private TabLayout mTabs;
 
     protected void onCreate(android.os.Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -46,8 +38,8 @@ public class MainActivity extends BaseActivity {
 
 
         // Instantiate a ViewPager and a PagerAdapter.
-        mPager = (ViewPager) findViewById(R.id.pager);
-        mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager(), this);
+        mPager = findViewById(R.id.pager);
+        mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager(), this);
 
         /* Toolbar and slider should have the same elevation */
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
@@ -72,8 +64,8 @@ public class MainActivity extends BaseActivity {
         mPagerAdapter.addTab(R.string.about, AboutFragment.class);
         mPager.setAdapter(mPagerAdapter);
 
-        mTabs = (TabBarView) findViewById(R.id.sliding_tabs);
-        mTabs.setViewPager(mPager);
+        //mTabs =  findViewById(R.id.sliding_tabs);
+        //mTabs.setViewPager(mPager);
     }
 
     private static final String FEATURE_TELEVISION = "android.hardware.type.television";
@@ -84,9 +76,9 @@ public class MainActivity extends BaseActivity {
                 || getPackageManager().hasSystemFeature(FEATURE_LEANBACK));
     }
 
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+
     private void disableToolbarElevation() {
-        ActionBar toolbar = getActionBar();
+        ActionBar toolbar = getSupportActionBar();
         toolbar.setElevation(0);
     }
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/activities/VPNPreferences.java b/main/src/ui/java/de/blinkt/openvpn/activities/VPNPreferences.java
index 06f1f7b7..2b6c94ad 100644
--- a/main/src/ui/java/de/blinkt/openvpn/activities/VPNPreferences.java
+++ b/main/src/ui/java/de/blinkt/openvpn/activities/VPNPreferences.java
@@ -6,19 +6,18 @@
 package de.blinkt.openvpn.activities;
 
 import android.annotation.TargetApi;
-import android.app.ActionBar;
-import android.app.Activity;
 import android.app.AlertDialog;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.PreferenceActivity;
-import android.support.v4n.view.ViewPager;
 import android.view.Menu;
 import android.view.MenuItem;
-
 import android.widget.Toast;
+
+import androidx.appcompat.app.ActionBar;
+import androidx.viewpager.widget.ViewPager;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ProfileManager;
@@ -33,13 +32,12 @@ import de.blinkt.openvpn.fragments.Settings_UserEditable;
 import de.blinkt.openvpn.fragments.ShowConfigFragment;
 import de.blinkt.openvpn.fragments.VPNProfileList;
 import de.blinkt.openvpn.views.ScreenSlidePagerAdapter;
-import de.blinkt.openvpn.views.TabBarView;
 
 
 public class VPNPreferences extends BaseActivity {
 
-    static final Class validFragments[] = new Class[] {
-        Settings_Authentication.class, Settings_Basic.class, Settings_IP.class,
+    static final Class[] validFragments = new Class[]{
+            Settings_Authentication.class, Settings_Basic.class, Settings_IP.class,
             Settings_Obscure.class, Settings_Routing.class, ShowConfigFragment.class,
             Settings_Connections.class, Settings_Allowed_Apps.class
     };
@@ -86,7 +84,7 @@ public class VPNPreferences extends BaseActivity {
 		}
 		if (mProfile.mTemporaryProfile)
         {
-            Toast.makeText(this, "Temporary profiles cannot be edited", Toast.LENGTH_LONG);
+            Toast.makeText(this, "Temporary profiles cannot be edited", Toast.LENGTH_LONG).show();
             finish();
         }
 	}
@@ -127,14 +125,11 @@ public class VPNPreferences extends BaseActivity {
 
         setContentView(R.layout.main_activity);
 
-        /* Toolbar and slider should have the same elevation */
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            disableToolbarElevation();
-        }
+        disableToolbarElevation();
 
         // Instantiate a ViewPager and a PagerAdapter.
-        mPager = (ViewPager) findViewById(R.id.pager);
-        mPagerAdapter = new ScreenSlidePagerAdapter(getFragmentManager(), this);
+        mPager = findViewById(R.id.pager);
+        mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager(), this);
 
 
         Bundle fragmentArguments = new Bundle();
@@ -160,28 +155,12 @@ public class VPNPreferences extends BaseActivity {
 
         mPager.setAdapter(mPagerAdapter);
 
-        TabBarView tabs = (TabBarView) findViewById(R.id.sliding_tabs);
-        tabs.setViewPager(mPager);
+        //TabBarView tabs = (TabBarView) findViewById(R.id.sliding_tabs);
+        //tabs.setViewPager(mPager);
 
 	}
 
 
-/*
-	@Override
-	public void onBuildHeaders(List<Header> target) {
-		loadHeadersFromResource(R.xml.vpn_headers, target);
-        Header headerToRemove=null;
-        for (Header header : target) {
-			if(header.fragmentArguments==null)
-				header.fragmentArguments = new Bundle();
-			header.fragmentArguments.putString(getPackageName() + ".profileUUID",mProfileUUID);
-            if (header.id == R.id.allowed_apps_header && Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
-                headerToRemove = header;
-		}
-        if (headerToRemove != null)
-            target.remove(headerToRemove);
-	}*/
-
 	@Override
 	public void onBackPressed() {
 		setResult(RESULT_OK, getIntent());
@@ -217,13 +196,7 @@ public class VPNPreferences extends BaseActivity {
 		dialog.setMessage(getString(R.string.remove_vpn_query, mProfile.mName));
 
 		dialog.setPositiveButton(android.R.string.yes,
-				new DialogInterface.OnClickListener() {
-			@Override
-			public void onClick(DialogInterface dialog, int which) {
-				removeProfile(mProfile);
-			}
-
-		});
+                (dialog1, which) -> removeProfile(mProfile));
 		dialog.setNegativeButton(android.R.string.no,null);
 		dialog.create().show();
 	}
@@ -235,9 +208,8 @@ public class VPNPreferences extends BaseActivity {
 
 	}
 
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private void disableToolbarElevation() {
-        ActionBar toolbar = getActionBar();
+        ActionBar toolbar = getSupportActionBar();
         toolbar.setElevation(0);
     }
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/AboutFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/AboutFragment.java
index 540f4a9a..6ab6e2cc 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/AboutFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/AboutFragment.java
@@ -5,7 +5,6 @@
 
 package de.blinkt.openvpn.fragments;
 
-import android.app.Fragment;
 import android.app.PendingIntent;
 import android.content.ComponentName;
 import android.content.Intent;
@@ -28,6 +27,8 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import androidx.fragment.app.Fragment;
+
 import com.android.vending.billing.IInAppBillingService;
 
 import de.blinkt.openvpn.core.NativeUtils;
@@ -47,8 +48,8 @@ import de.blinkt.openvpn.core.VpnStatus;
 
 public class AboutFragment extends Fragment implements View.OnClickListener {
 
-    public static final String INAPPITEM_TYPE_INAPP = "inapp";
-    public static final String RESPONSE_CODE = "RESPONSE_CODE";
+    private static final String INAPPITEM_TYPE_INAPP = "inapp";
+    private static final String RESPONSE_CODE = "RESPONSE_CODE";
     private static final int DONATION_CODE = 12;
     private static final int BILLING_RESPONSE_RESULT_OK = 0;
     private static final String RESPONSE_BUY_INTENT = "BUY_INTENT";
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/FaqFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/FaqFragment.java
index f9d2d47c..f40c6825 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/FaqFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/FaqFragment.java
@@ -5,10 +5,11 @@
 
 package de.blinkt.openvpn.fragments;
 
-import android.app.Fragment;
 import android.content.Context;
 import android.os.Build;
 import android.os.Bundle;
+
+import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.recyclerview.widget.StaggeredGridLayoutManager;
 import android.util.DisplayMetrics;
@@ -184,7 +185,7 @@ public class FaqFragment extends Fragment {
         columns = Math.max(1, columns);
 
 
-        mRecyclerView = (RecyclerView) v.findViewById(R.id.faq_recycler_view);
+        mRecyclerView = v.findViewById(R.id.faq_recycler_view);
 
         // use this setting to improve performance if you know that changes
         // in content do not change the layout size of the RecyclerView
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/GeneralSettings.java b/main/src/ui/java/de/blinkt/openvpn/fragments/GeneralSettings.java
index 34d37823..1d8b5f77 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/GeneralSettings.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/GeneralSettings.java
@@ -4,8 +4,8 @@
  */
 
 package de.blinkt.openvpn.fragments;
+
 import java.io.File;
-import java.util.Collection;
 
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
@@ -18,13 +18,13 @@ import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.os.Build;
 import android.os.Bundle;
-import android.preference.CheckBoxPreference;
-import android.preference.ListPreference;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceClickListener;
-import android.preference.PreferenceCategory;
-import android.preference.PreferenceFragment;
-import android.preference.PreferenceManager;
+
+
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceFragmentCompat;
 
 import de.blinkt.openvpn.BuildConfig;
 import de.blinkt.openvpn.R;
@@ -34,28 +34,28 @@ import de.blinkt.openvpn.api.ExternalAppDatabase;
 import de.blinkt.openvpn.core.ProfileManager;
 
 
-public class GeneralSettings extends PreferenceFragment implements OnPreferenceClickListener, OnClickListener, Preference.OnPreferenceChangeListener {
+public class GeneralSettings extends PreferenceFragmentCompat implements Preference.OnPreferenceClickListener, OnClickListener, Preference.OnPreferenceChangeListener {
 
-	private ExternalAppDatabase mExtapp;
-	private ListPreference mAlwaysOnVPN;
+    private ExternalAppDatabase mExtapp;
+    private ListPreference mAlwaysOnVPN;
 
-	@Override
-	public void onCreate(Bundle savedInstanceState) {
-		super.onCreate(savedInstanceState);
 
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
 
-		// Load the preferences from an XML resource
-		addPreferencesFromResource(R.xml.general_settings);
 
+        // Load the preferences from an XML resource
+        addPreferencesFromResource(R.xml.general_settings);
 
-        PreferenceCategory devHacks = (PreferenceCategory) findPreference("device_hacks");
-		mAlwaysOnVPN = (ListPreference) findPreference("alwaysOnVpn");
+
+        PreferenceCategory devHacks = findPreference("device_hacks");
+        mAlwaysOnVPN = findPreference("alwaysOnVpn");
         mAlwaysOnVPN.setOnPreferenceChangeListener(this);
 
 
         Preference loadtun = findPreference("loadTunModule");
-		if(!isTunModuleAvailable()) {
-			loadtun.setEnabled(false);
+        if (!isTunModuleAvailable()) {
+            loadtun.setEnabled(false);
             devHacks.removePreference(loadtun);
         }
 
@@ -65,59 +65,56 @@ public class GeneralSettings extends PreferenceFragment implements OnPreferenceC
         }
 
         CheckBoxPreference useInternalFS = (CheckBoxPreference) findPreference("useInternalFileSelector");
-        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT)
-		{
-			devHacks.removePreference(useInternalFS);
-		}
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
+            devHacks.removePreference(useInternalFS);
+        }
 
-		/* Android P does not allow access to the file storage anymore */
-		if (Build.VERSION.SDK_INT > Build.VERSION_CODES.P)
-		{
-			Preference useInternalFileSelector = findPreference("useInternalFileSelector");
-			devHacks.removePreference(useInternalFileSelector);
-		}
+        /* Android P does not allow access to the file storage anymore */
+        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.P) {
+            Preference useInternalFileSelector = findPreference("useInternalFileSelector");
+            devHacks.removePreference(useInternalFileSelector);
+        }
 
-		mExtapp = new ExternalAppDatabase(getActivity());
-		Preference clearapi = findPreference("clearapi");
-		clearapi.setOnPreferenceClickListener(this);
+        mExtapp = new ExternalAppDatabase(getActivity());
+        Preference clearapi = findPreference("clearapi");
+        clearapi.setOnPreferenceClickListener(this);
 
-		findPreference("osslspeed").setOnPreferenceClickListener(this);
+        findPreference("osslspeed").setOnPreferenceClickListener(this);
 
-        if(devHacks.getPreferenceCount()==0)
+        if (devHacks.getPreferenceCount() == 0)
             getPreferenceScreen().removePreference(devHacks);
 
         if (!BuildConfig.openvpn3) {
             PreferenceCategory appBehaviour = (PreferenceCategory) findPreference("app_behaviour");
-			CheckBoxPreference ovpn3 = (CheckBoxPreference) findPreference("ovpn3");
-			ovpn3.setEnabled(false);
-			ovpn3.setChecked(false);
+            CheckBoxPreference ovpn3 = (CheckBoxPreference) findPreference("ovpn3");
+            ovpn3.setEnabled(false);
+            ovpn3.setChecked(false);
         }
 
 
-		setClearApiSummary();
-	}
-
-	@Override
-	public void onResume() {
-		super.onResume();
+        setClearApiSummary();
+    }
 
 
+    @Override
+    public void onResume() {
+        super.onResume();
 
 
         VpnProfile vpn = ProfileManager.getAlwaysOnVPN(getActivity());
-		StringBuffer sb = new StringBuffer(getString(R.string.defaultvpnsummary));
-		sb.append('\n');
-        if (vpn== null)
+        StringBuffer sb = new StringBuffer(getString(R.string.defaultvpnsummary));
+        sb.append('\n');
+        if (vpn == null)
             sb.append(getString(R.string.novpn_selected));
         else
-           sb.append(getString(R.string.vpnselected, vpn.getName()));
-		mAlwaysOnVPN.setSummary(sb.toString());
+            sb.append(getString(R.string.vpnselected, vpn.getName()));
+        mAlwaysOnVPN.setSummary(sb.toString());
 
     }
 
     @Override
     public boolean onPreferenceChange(Preference preference, Object newValue) {
-        if (preference== mAlwaysOnVPN) {
+        if (preference == mAlwaysOnVPN) {
             VpnProfile vpn = ProfileManager.get(getActivity(), (String) newValue);
             mAlwaysOnVPN.setSummary(vpn.getName());
         }
@@ -125,66 +122,65 @@ public class GeneralSettings extends PreferenceFragment implements OnPreferenceC
     }
 
     private void setClearApiSummary() {
-		Preference clearapi = findPreference("clearapi");
-
-		if(mExtapp.getExtAppList().isEmpty()) {
-			clearapi.setEnabled(false);
-			clearapi.setSummary(R.string.no_external_app_allowed);
-		} else {
-			clearapi.setEnabled(true);
-			clearapi.setSummary(getString(R.string.allowed_apps, getExtAppList(", ")));
-		}
-	}
-
-	private String getExtAppList(String delim) {
-		ApplicationInfo app;
-		PackageManager pm = getActivity().getPackageManager();
-
-		StringBuilder applist = new StringBuilder();
-		for (String packagename : mExtapp.getExtAppList()) {
-			try {
-				app = pm.getApplicationInfo(packagename, 0);
-				if (applist.length() != 0)
-					applist.append(delim);
-				applist.append(app.loadLabel(pm));
-
-			} catch (NameNotFoundException e) {
-				// App not found. Remove it from the list
-				mExtapp.removeApp(packagename);
-			}
-		}
-
-		return applist.toString();
-	}
-
-	private boolean isTunModuleAvailable() {
-		// Check if the tun module exists on the file system
+        Preference clearapi = findPreference("clearapi");
+
+        if (mExtapp.getExtAppList().isEmpty()) {
+            clearapi.setEnabled(false);
+            clearapi.setSummary(R.string.no_external_app_allowed);
+        } else {
+            clearapi.setEnabled(true);
+            clearapi.setSummary(getString(R.string.allowed_apps, getExtAppList(", ")));
+        }
+    }
+
+    private String getExtAppList(String delim) {
+        ApplicationInfo app;
+        PackageManager pm = getActivity().getPackageManager();
+
+        StringBuilder applist = new StringBuilder();
+        for (String packagename : mExtapp.getExtAppList()) {
+            try {
+                app = pm.getApplicationInfo(packagename, 0);
+                if (applist.length() != 0)
+                    applist.append(delim);
+                applist.append(app.loadLabel(pm));
+
+            } catch (NameNotFoundException e) {
+                // App not found. Remove it from the list
+                mExtapp.removeApp(packagename);
+            }
+        }
+
+        return applist.toString();
+    }
+
+    private boolean isTunModuleAvailable() {
+        // Check if the tun module exists on the file system
         return new File("/system/lib/modules/tun.ko").length() > 10;
     }
 
-	@Override
-	public boolean onPreferenceClick(Preference preference) {
-		if(preference.getKey().equals("clearapi")){
-			Builder builder = new AlertDialog.Builder(getActivity());
-			builder.setPositiveButton(R.string.clear, this);
-			builder.setNegativeButton(android.R.string.cancel, null);
-			builder.setMessage(getString(R.string.clearappsdialog,getExtAppList("\n")));
-			builder.show();
-		} else if (preference.getKey().equals("osslspeed")) {
-			startActivity(new Intent(getActivity(), OpenSSLSpeed.class));
-		}
-
-		return true;
-	}
-
-	@Override
-	public void onClick(DialogInterface dialog, int which) {
-		if( which == Dialog.BUTTON_POSITIVE){
-			mExtapp.clearAllApiApps();
-			setClearApiSummary();
-		}
-	}
+    @Override
+    public boolean onPreferenceClick(Preference preference) {
+        if (preference.getKey().equals("clearapi")) {
+            Builder builder = new AlertDialog.Builder(getActivity());
+            builder.setPositiveButton(R.string.clear, this);
+            builder.setNegativeButton(android.R.string.cancel, null);
+            builder.setMessage(getString(R.string.clearappsdialog, getExtAppList("\n")));
+            builder.show();
+        } else if (preference.getKey().equals("osslspeed")) {
+            startActivity(new Intent(getActivity(), OpenSSLSpeed.class));
+        }
+
+        return true;
+    }
 
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == Dialog.BUTTON_POSITIVE) {
+            mExtapp.clearAllApiApps();
+            setClearApiSummary();
+        }
+    }
 
 
 }
\ No newline at end of file
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/GraphFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/GraphFragment.java
index 4ddf90c4..5d83b8fc 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/GraphFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/GraphFragment.java
@@ -5,7 +5,6 @@
 
 package de.blinkt.openvpn.fragments;
 
-import android.app.Fragment;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.content.res.Resources;
@@ -22,6 +21,7 @@ import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
 
 import com.github.mikephil.charting.charts.LineChart;
 import com.github.mikephil.charting.components.XAxis;
@@ -102,13 +102,10 @@ public class GraphFragment extends Fragment implements VpnStatus.ByteCountListen
                 break;
         }
 
-        logScaleView.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
-            @Override
-            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
-                mLogScale = isChecked;
-                mChartAdapter.notifyDataSetChanged();
-                getActivity().getPreferences(MODE_PRIVATE).edit().putBoolean(PREF_USE_LOG, isChecked).apply();
-            }
+        logScaleView.setOnCheckedChangeListener((buttonView, isChecked) -> {
+            mLogScale = isChecked;
+            mChartAdapter.notifyDataSetChanged();
+            getActivity().getPreferences(MODE_PRIVATE).edit().putBoolean(PREF_USE_LOG, isChecked).apply();
         });
 
         mHandler = new Handler();
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/KeyChainSettingsFragment.kt b/main/src/ui/java/de/blinkt/openvpn/fragments/KeyChainSettingsFragment.kt
index 5008fe00..ef6eae69 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/KeyChainSettingsFragment.kt
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/KeyChainSettingsFragment.kt
@@ -46,7 +46,7 @@ internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnC
         @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
         @Throws(KeyChainException::class, InterruptedException::class)
         get() {
-            val key: PrivateKey = KeyChain.getPrivateKey(activity.applicationContext, mProfile.mAlias) ?: return false
+            val key: PrivateKey = KeyChain.getPrivateKey(activity!!.applicationContext, mProfile.mAlias) ?: return false
 
             if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
                 val keyFactory = KeyFactory.getInstance(key.getAlgorithm(), "AndroidKeyStore")
@@ -86,9 +86,9 @@ internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnC
         object : Thread() {
             override fun run() {
                 try {
-                    val b = ExtAuthHelper.getCertificateMetaData(activity, mProfile.mExternalAuthenticator, mProfile.mAlias)
+                    val b = ExtAuthHelper.getCertificateMetaData(context!!, mProfile.mExternalAuthenticator, mProfile.mAlias)
                     mProfile.mAlias = b.getString(ExtAuthHelper.EXTRA_ALIAS)
-                    activity.runOnUiThread { setAlias() }
+                    activity!!.runOnUiThread { setAlias() }
                 } catch (e: KeyChainException) {
                     e.printStackTrace()
                 }
@@ -108,14 +108,14 @@ internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnC
 
                     if (external) {
                         if (!TextUtils.isEmpty(mProfile.mExternalAuthenticator) && !TextUtils.isEmpty(mProfile.mAlias)) {
-                            cert = ExtAuthHelper.getCertificateChain(activity, mProfile.mExternalAuthenticator, mProfile.mAlias)!![0]
-                            metadata = ExtAuthHelper.getCertificateMetaData(activity, mProfile.mExternalAuthenticator, mProfile.mAlias)
+                            cert = ExtAuthHelper.getCertificateChain(context!!, mProfile.mExternalAuthenticator, mProfile.mAlias)!![0]
+                            metadata = ExtAuthHelper.getCertificateMetaData(context!!, mProfile.mExternalAuthenticator, mProfile.mAlias)
                         } else {
                             cert = null
                             certstr = getString(R.string.extauth_not_configured)
                         }
                     } else {
-                        val certChain = KeyChain.getCertificateChain(activity.applicationContext, mProfile.mAlias)
+                        val certChain = KeyChain.getCertificateChain(activity!!.applicationContext, mProfile.mAlias)
                         if (certChain != null) {
                             cert = certChain[0]
                             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
@@ -137,7 +137,7 @@ internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnC
 
                 val certStringCopy = certstr
                 val finalMetadata = metadata
-                activity.runOnUiThread {
+                activity!!.runOnUiThread {
                     mAliasCertificate.text = certStringCopy
                     if (finalMetadata != null)
                         mExtAliasName.text = finalMetadata.getString(ExtAuthHelper.EXTRA_DESCRIPTION)
@@ -210,7 +210,7 @@ internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnC
 
     fun showCertDialog() {
         try {
-            KeyChain.choosePrivateKeyAlias(activity,
+            KeyChain.choosePrivateKeyAlias(activity!!,
                     { alias ->
                         // Credential alias selected.  Remember the alias selection for future use.
                         mProfile.mAlias = alias
@@ -248,10 +248,10 @@ internal abstract class KeyChainSettingsFragment : Settings_Fragment(), View.OnC
         return true
     }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) {
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
 
-        if (requestCode == UPDATEE_EXT_ALIAS && resultCode == Activity.RESULT_OK) {
+        if (data != null && requestCode == UPDATEE_EXT_ALIAS && resultCode == Activity.RESULT_OK) {
             mProfile.mAlias = data.getStringExtra(ExtAuthHelper.EXTRA_ALIAS)
             mExtAliasName.text = data.getStringExtra(ExtAuthHelper.EXTRA_DESCRIPTION)
         }
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/LogFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/LogFragment.java
index 32da0ac5..be2007e5 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/LogFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/LogFragment.java
@@ -9,8 +9,6 @@ import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.app.Activity;
-import android.app.AlertDialog;
-import android.app.ListFragment;
 import android.content.ClipData;
 import android.content.ClipboardManager;
 import android.content.Context;
@@ -25,6 +23,9 @@ import android.os.Handler.Callback;
 import android.os.Message;
 import android.preference.PreferenceManager;
 import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.ListFragment;
+
 import android.text.SpannableString;
 import android.text.format.DateFormat;
 import android.text.style.ImageSpan;
@@ -529,16 +530,11 @@ public class LogFragment extends ListFragment implements StateListener, SeekBar.
 
 
             dialog.setPositiveButton(R.string.restart,
-                    new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            Intent intent = new Intent(getActivity(), LaunchVPN.class);
-                            intent.putExtra(LaunchVPN.EXTRA_KEY, profile.getUUIDString());
-                            intent.setAction(Intent.ACTION_MAIN);
-                            startActivity(intent);
-                        }
-
-
+                    (dialog1, which) -> {
+                        Intent intent = new Intent(getActivity(), LaunchVPN.class);
+                        intent.putExtra(LaunchVPN.EXTRA_KEY, profile.getUUIDString());
+                        intent.setAction(Intent.ACTION_MAIN);
+                        startActivity(intent);
                     });
             dialog.setNegativeButton(R.string.ignore, null);
             dialog.create().show();
@@ -564,18 +560,13 @@ public class LogFragment extends ListFragment implements StateListener, SeekBar.
         super.onActivityCreated(savedInstanceState);
         ListView lv = getListView();
 
-        lv.setOnItemLongClickListener(new OnItemLongClickListener() {
-
-            @Override
-            public boolean onItemLongClick(AdapterView<?> parent, View view,
-                                           int position, long id) {
-                ClipboardManager clipboard = (ClipboardManager)
-                        getActivity().getSystemService(Context.CLIPBOARD_SERVICE);
-                ClipData clip = ClipData.newPlainText("Log Entry", ((TextView) view).getText());
-                clipboard.setPrimaryClip(clip);
-                Toast.makeText(getActivity(), R.string.copied_entry, Toast.LENGTH_SHORT).show();
-                return true;
-            }
+        lv.setOnItemLongClickListener((parent, view, position, id) -> {
+            ClipboardManager clipboard = (ClipboardManager)
+                    getActivity().getSystemService(Context.CLIPBOARD_SERVICE);
+            ClipData clip = ClipData.newPlainText("Log Entry", ((TextView) view).getText());
+            clipboard.setPrimaryClip(clip);
+            Toast.makeText(getActivity(), R.string.copied_entry, Toast.LENGTH_SHORT).show();
+            return true;
         });
     }
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/OpenVpnPreferencesFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/OpenVpnPreferencesFragment.java
index 9ac8bebb..212c5e71 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/OpenVpnPreferencesFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/OpenVpnPreferencesFragment.java
@@ -6,12 +6,14 @@
 package de.blinkt.openvpn.fragments;
 
 import android.os.Bundle;
-import android.preference.PreferenceFragment;
+
+import androidx.preference.PreferenceFragmentCompat;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ProfileManager;
 
-public abstract class OpenVpnPreferencesFragment extends PreferenceFragment {
+public abstract class OpenVpnPreferencesFragment extends PreferenceFragmentCompat {
 
 	protected VpnProfile mProfile;
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/SendDumpFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/SendDumpFragment.java
index 0fe40905..5bc0bbb1 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/SendDumpFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/SendDumpFragment.java
@@ -9,7 +9,6 @@ import java.io.File;
 import java.util.ArrayList;
 import java.util.Date;
 
-import android.app.Fragment;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageInfo;
@@ -23,106 +22,95 @@ import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import androidx.fragment.app.Fragment;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.core.VpnStatus;
 
-public class SendDumpFragment extends Fragment  {
-
-	@Override
-	public View onCreateView(LayoutInflater inflater, ViewGroup container,
-			Bundle savedInstanceState) {
-
-		final View v = inflater.inflate(R.layout.fragment_senddump, container, false);
-		v.findViewById(R.id.senddump).setOnClickListener(new OnClickListener() {
-
-			@Override
-			public void onClick(View v) {
-				emailMiniDumps();
-			}
-		});
-
-		new Thread(new Runnable() {
-			@Override
-			public void run() {
-				final Pair<File, Long> ldump = getLastestDump(getActivity());
-				if (ldump==null)
-					return;
-				// Do in background since it does I/O
-				getActivity().runOnUiThread(new Runnable() {
-					@Override
-					public void run() {
-						TextView dumpDateText = (TextView) v.findViewById(R.id.dumpdate);
-						String datestr = (new Date(ldump.second)).toString();
-                        long timediff = System.currentTimeMillis() - ldump.second;
-						long minutes = timediff / 1000 / 60 % 60;
-						long hours = timediff / 1000 / 60 / 60;
-						dumpDateText.setText(getString(R.string.lastdumpdate, hours, minutes, datestr));
-
-					}
-				});
-			}
-		}).start();
-		return v;
-	}
-
-	public void emailMiniDumps()
-	{
-		//need to "send multiple" to get more than one attachment
-		final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND_MULTIPLE);
-		emailIntent.setType("*/*");
-		emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
-				new String[]{"Arne Schwabe <arne@rfc2549.org>"});
-
-		String version;
-		String name="ics-openvpn";
-		try {
-			PackageInfo packageinfo = getActivity().getPackageManager().getPackageInfo(getActivity().getPackageName(), 0);
-			version = packageinfo.versionName;
-			name = packageinfo.applicationInfo.name;
-		} catch (NameNotFoundException e) {
-			version = "error fetching version";
-		}
-
-
-		emailIntent.putExtra(Intent.EXTRA_SUBJECT, String.format("%s(%s) %s Minidump",name, getActivity().getPackageName(), version));
-
-		emailIntent.putExtra(Intent.EXTRA_TEXT, "Please describe the issue you have experienced");
-
-		ArrayList<Uri> uris = new ArrayList<>();
-
-		Pair<File, Long> ldump = getLastestDump(getActivity());
-		if(ldump==null) {
-			VpnStatus.logError("No Minidump found!");
-		}
-
-		uris.add(Uri.parse("content://de.blinkt.openvpn.FileProvider/" + ldump.first.getName()));
-		uris.add(Uri.parse("content://de.blinkt.openvpn.FileProvider/" + ldump.first.getName() + ".log"));
-
-		emailIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-		emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
-		startActivity(emailIntent);
-	}
-
-	static public Pair<File,Long> getLastestDump(Context c) {
-		long newestDumpTime=0;
-		File newestDumpFile=null;
-
-        if (c.getCacheDir() ==null)
+public class SendDumpFragment extends Fragment {
+
+    static public Pair<File, Long> getLastestDump(Context c) {
+        long newestDumpTime = 0;
+        File newestDumpFile = null;
+
+        if (c.getCacheDir() == null)
+            return null;
+
+        for (File f : c.getCacheDir().listFiles()) {
+            if (!f.getName().endsWith(".dmp"))
+                continue;
+
+            if (newestDumpTime < f.lastModified()) {
+                newestDumpTime = f.lastModified();
+                newestDumpFile = f;
+            }
+        }
+        // Ignore old dumps
+        if (System.currentTimeMillis() - 48 * 60 * 1000 > newestDumpTime)
             return null;
 
-		for(File f:c.getCacheDir().listFiles()) {
-			if(!f.getName().endsWith(".dmp"))
-				continue;
-
-			if (newestDumpTime < f.lastModified()) {
-				newestDumpTime = f.lastModified();
-				newestDumpFile=f;
-			}
-		}
-		// Ignore old dumps
-		if(System.currentTimeMillis() - 48 * 60 * 1000 > newestDumpTime )
-		    return null;
-
-		return Pair.create(newestDumpFile, newestDumpTime);
-	}
+        return Pair.create(newestDumpFile, newestDumpTime);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        final View v = inflater.inflate(R.layout.fragment_senddump, container, false);
+        v.findViewById(R.id.senddump).setOnClickListener(v1 -> emailMiniDumps());
+
+        new Thread(() -> {
+            final Pair<File, Long> ldump = getLastestDump(getActivity());
+            if (ldump == null)
+                return;
+            // Do in background since it does I/O
+            getActivity().runOnUiThread(() -> {
+                TextView dumpDateText = (TextView) v.findViewById(R.id.dumpdate);
+                String datestr = (new Date(ldump.second)).toString();
+                long timediff = System.currentTimeMillis() - ldump.second;
+                long minutes = timediff / 1000 / 60 % 60;
+                long hours = timediff / 1000 / 60 / 60;
+                dumpDateText.setText(getString(R.string.lastdumpdate, hours, minutes, datestr));
+
+            });
+        }).start();
+        return v;
+    }
+
+    public void emailMiniDumps() {
+        //need to "send multiple" to get more than one attachment
+        final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND_MULTIPLE);
+        emailIntent.setType("*/*");
+        emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
+                new String[]{"Arne Schwabe <arne@rfc2549.org>"});
+
+        String version;
+        String name = "ics-openvpn";
+        try {
+            PackageInfo packageinfo = getActivity().getPackageManager().getPackageInfo(getActivity().getPackageName(), 0);
+            version = packageinfo.versionName;
+            name = packageinfo.applicationInfo.name;
+        } catch (NameNotFoundException e) {
+            version = "error fetching version";
+        }
+
+
+        emailIntent.putExtra(Intent.EXTRA_SUBJECT, String.format("%s(%s) %s Minidump", name, getActivity().getPackageName(), version));
+
+        emailIntent.putExtra(Intent.EXTRA_TEXT, "Please describe the issue you have experienced");
+
+        ArrayList<Uri> uris = new ArrayList<>();
+
+        Pair<File, Long> ldump = getLastestDump(getActivity());
+        if (ldump == null) {
+            VpnStatus.logError("No Minidump found!");
+        }
+
+        uris.add(Uri.parse("content://de.blinkt.openvpn.FileProvider/" + ldump.first.getName()));
+        uris.add(Uri.parse("content://de.blinkt.openvpn.FileProvider/" + ldump.first.getName() + ".log"));
+
+        emailIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+        emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
+        startActivity(emailIntent);
+    }
 }
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Allowed_Apps.kt b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Allowed_Apps.kt
index dd2aa3b7..e3879775 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Allowed_Apps.kt
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Allowed_Apps.kt
@@ -6,8 +6,6 @@
 package de.blinkt.openvpn.fragments
 
 import android.Manifest
-import android.app.Activity
-import android.app.Fragment
 import android.content.Context
 import android.content.pm.ApplicationInfo
 import android.content.pm.PackageManager
@@ -29,6 +27,7 @@ import android.widget.ListView
 import android.widget.SearchView
 import android.widget.Switch
 import android.widget.TextView
+import androidx.fragment.app.Fragment
 
 import java.util.Collections
 import java.util.Locale
@@ -37,6 +36,7 @@ import java.util.Vector
 import de.blinkt.openvpn.R
 import de.blinkt.openvpn.VpnProfile
 import de.blinkt.openvpn.core.ProfileManager
+import org.jetbrains.anko.runOnUiThread
 
 /**
  * Created by arne on 16.11.14.
@@ -75,9 +75,9 @@ class Settings_Allowed_Apps : Fragment(), AdapterView.OnItemClickListener, Compo
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        val profileUuid = arguments.getString(activity.packageName + ".profileUUID")
+        val profileUuid = requireArguments().getString(activity!!.packageName + ".profileUUID")
         mProfile = ProfileManager.get(activity, profileUuid)
-        activity.title = getString(R.string.edit_profile_title, mProfile.name)
+        activity!!.title = getString(R.string.edit_profile_title, mProfile.name)
         setHasOptionsMenu(true)
     }
 
@@ -116,7 +116,7 @@ class Settings_Allowed_Apps : Fragment(), AdapterView.OnItemClickListener, Compo
 
         val vpnOnDefaultSwitch = mSettingsView.findViewById<View>(R.id.default_allow) as Switch
 
-        vpnOnDefaultSwitch.setOnCheckedChangeListener { buttonView, isChecked ->
+        vpnOnDefaultSwitch.setOnCheckedChangeListener { _, isChecked ->
             changeDisallowText(isChecked)
             mProfile.mAllowedAppsVpnAreDisallowed = isChecked
         }
@@ -125,19 +125,19 @@ class Settings_Allowed_Apps : Fragment(), AdapterView.OnItemClickListener, Compo
 
         val vpnAllowBypassSwitch = mSettingsView.findViewById<View>(R.id.allow_bypass) as Switch
 
-        vpnAllowBypassSwitch.setOnCheckedChangeListener { buttonView, isChecked -> mProfile.mAllowAppVpnBypass = isChecked }
+        vpnAllowBypassSwitch.setOnCheckedChangeListener { _, isChecked -> mProfile.mAllowAppVpnBypass = isChecked }
 
         vpnAllowBypassSwitch.isChecked = mProfile.mAllowAppVpnBypass
 
         mListView = v.findViewById<View>(android.R.id.list) as ListView
 
-        mListAdapter = PackageAdapter(activity, mProfile)
+        mListAdapter = PackageAdapter(requireContext(), mProfile)
         mListView.adapter = mListAdapter
         mListView.onItemClickListener = this
 
         mListView.emptyView = v.findViewById(R.id.loading_container)
 
-        Thread(Runnable { mListAdapter.populateList(activity) }).start()
+        Thread(Runnable { mListAdapter.populateList(requireContext()) }).start()
 
         return v
     }
@@ -197,7 +197,7 @@ class Settings_Allowed_Apps : Fragment(), AdapterView.OnItemClickListener, Compo
         private val mProfile = vp
 
 
-        fun populateList(c: Activity) {
+        fun populateList(c: Context) {
             val installedPackages = mPm.getInstalledApplications(PackageManager.GET_META_DATA)
 
             // Remove apps not using Internet
@@ -282,11 +282,11 @@ class Settings_Allowed_Apps : Fragment(), AdapterView.OnItemClickListener, Compo
         }
 
         private inner class ItemFilter : Filter() {
-            override fun performFiltering(constraint: CharSequence): Filter.FilterResults {
+            override fun performFiltering(constraint: CharSequence): FilterResults {
 
                 val filterString = constraint.toString().toLowerCase(Locale.getDefault())
 
-                val results = Filter.FilterResults()
+                val results = FilterResults()
 
 
                 val count = mPackages.size
@@ -313,7 +313,7 @@ class Settings_Allowed_Apps : Fragment(), AdapterView.OnItemClickListener, Compo
                 return results
             }
 
-            override fun publishResults(constraint: CharSequence, results: Filter.FilterResults) {
+            override fun publishResults(constraint: CharSequence, results: FilterResults) {
                 mFilteredData = results.values as Vector<ApplicationInfo>
                 notifyDataSetChanged()
             }
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Authentication.java b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Authentication.java
index 8fd6aa98..b58db81a 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Authentication.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Authentication.java
@@ -9,91 +9,98 @@ import android.app.Activity;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
-import android.preference.CheckBoxPreference;
-import android.preference.EditTextPreference;
-import android.preference.ListPreference;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceChangeListener;
-import android.preference.Preference.OnPreferenceClickListener;
-import android.preference.SwitchPreference;
 import android.text.TextUtils;
 import android.util.Pair;
+
+import androidx.fragment.app.DialogFragment;
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.EditTextPreference;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
 import de.blinkt.openvpn.activities.FileSelect;
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.core.VpnStatus;
 import de.blinkt.openvpn.views.RemoteCNPreference;
 import de.blinkt.openvpn.VpnProfile;
+import de.blinkt.openvpn.views.RemoteCNPreferenceDialog;
 
 import java.io.IOException;
 
 
-public class Settings_Authentication extends OpenVpnPreferencesFragment implements OnPreferenceChangeListener, OnPreferenceClickListener {
-	private static final int SELECT_TLS_FILE_LEGACY_DIALOG = 23223232;
-    private static final int SELECT_TLS_FILE_KITKAT = SELECT_TLS_FILE_LEGACY_DIALOG +1;
+public class Settings_Authentication extends OpenVpnPreferencesFragment implements Preference.OnPreferenceChangeListener, Preference.OnPreferenceClickListener {
+    private static final int SELECT_TLS_FILE_LEGACY_DIALOG = 23223232;
+    private static final int SELECT_TLS_FILE_KITKAT = SELECT_TLS_FILE_LEGACY_DIALOG + 1;
     private CheckBoxPreference mExpectTLSCert;
-	private CheckBoxPreference mCheckRemoteCN;
-	private RemoteCNPreference mRemoteCN;
-	private ListPreference mTLSAuthDirection;
-	private Preference mTLSAuthFile;
-	private SwitchPreference mUseTLSAuth;
-	private EditTextPreference mCipher;
-	private String mTlsAuthFileData;
-	private EditTextPreference mAuth;
+    private CheckBoxPreference mCheckRemoteCN;
+    private RemoteCNPreference mRemoteCN;
+    private ListPreference mTLSAuthDirection;
+    private Preference mTLSAuthFile;
+    private SwitchPreference mUseTLSAuth;
+    private EditTextPreference mCipher;
+    private String mTlsAuthFileData;
+    private EditTextPreference mAuth;
     private EditTextPreference mRemoteX509Name;
 
     @Override
-	public void onCreate(Bundle savedInstanceState) {
-		super.onCreate(savedInstanceState);
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
 
-		// Load the preferences from an XML resource
-		addPreferencesFromResource(R.xml.vpn_authentification);
+        // Load the preferences from an XML resource
+        addPreferencesFromResource(R.xml.vpn_authentification);
 
-		mExpectTLSCert = (CheckBoxPreference) findPreference("remoteServerTLS");
-		mCheckRemoteCN = (CheckBoxPreference) findPreference("checkRemoteCN");
-		mRemoteCN = (RemoteCNPreference) findPreference("remotecn");
-		mRemoteCN.setOnPreferenceChangeListener(this);
+        mExpectTLSCert = findPreference("remoteServerTLS");
+        mCheckRemoteCN = (CheckBoxPreference) findPreference("checkRemoteCN");
+        mRemoteCN = (RemoteCNPreference) findPreference("remotecn");
+        mRemoteCN.setOnPreferenceChangeListener(this);
 
-		mRemoteX509Name = (EditTextPreference) findPreference("remotex509name");
+        mRemoteX509Name = (EditTextPreference) findPreference("remotex509name");
         mRemoteX509Name.setOnPreferenceChangeListener(this);
 
-		mUseTLSAuth = (SwitchPreference) findPreference("useTLSAuth" );
-		mTLSAuthFile = findPreference("tlsAuthFile");
-		mTLSAuthDirection = (ListPreference) findPreference("tls_direction");
+        mUseTLSAuth = (SwitchPreference) findPreference("useTLSAuth");
+        mTLSAuthFile = findPreference("tlsAuthFile");
+        mTLSAuthDirection = (ListPreference) findPreference("tls_direction");
+
+
+        mTLSAuthFile.setOnPreferenceClickListener(this);
 
+        mCipher = (EditTextPreference) findPreference("cipher");
+        mCipher.setOnPreferenceChangeListener(this);
 
-		mTLSAuthFile.setOnPreferenceClickListener(this);
+        mAuth = (EditTextPreference) findPreference("auth");
+        mAuth.setOnPreferenceChangeListener(this);
 
-		mCipher =(EditTextPreference) findPreference("cipher");
-		mCipher.setOnPreferenceChangeListener(this);
+        loadSettings();
 
-		mAuth =(EditTextPreference) findPreference("auth");
-		mAuth.setOnPreferenceChangeListener(this);
+    }
 
-		loadSettings();
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
 
-	}
+    }
 
-	@Override
-	protected void loadSettings() {
+    @Override
+    protected void loadSettings() {
 
-		mExpectTLSCert.setChecked(mProfile.mExpectTLSCert);
-		mCheckRemoteCN.setChecked(mProfile.mCheckRemoteCN);
-		mRemoteCN.setDN(mProfile.mRemoteCN);
-		mRemoteCN.setAuthType(mProfile.mX509AuthType);
-		onPreferenceChange(mRemoteCN,
-				new Pair<Integer, String>(mProfile.mX509AuthType, mProfile.mRemoteCN));
+        mExpectTLSCert.setChecked(mProfile.mExpectTLSCert);
+        mCheckRemoteCN.setChecked(mProfile.mCheckRemoteCN);
+        mRemoteCN.setDN(mProfile.mRemoteCN);
+        mRemoteCN.setAuthType(mProfile.mX509AuthType);
+        onPreferenceChange(mRemoteCN,
+                new Pair<Integer, String>(mProfile.mX509AuthType, mProfile.mRemoteCN));
 
         mRemoteX509Name.setText(mProfile.mx509UsernameField);
         onPreferenceChange(mRemoteX509Name, mProfile.mx509UsernameField);
 
-		mUseTLSAuth.setChecked(mProfile.mUseTLSAuth);
-		mTlsAuthFileData= mProfile.mTLSAuthFilename;
-		setTlsAuthSummary(mTlsAuthFileData);
-		mTLSAuthDirection.setValue(mProfile.mTLSAuthDirection);
-		mCipher.setText(mProfile.mCipher);
-		onPreferenceChange(mCipher, mProfile.mCipher);
-		mAuth.setText(mProfile.mAuth);
-		onPreferenceChange(mAuth, mProfile.mAuth);
+        mUseTLSAuth.setChecked(mProfile.mUseTLSAuth);
+        mTlsAuthFileData = mProfile.mTLSAuthFilename;
+        setTlsAuthSummary(mTlsAuthFileData);
+        mTLSAuthDirection.setValue(mProfile.mTLSAuthDirection);
+        mCipher.setText(mProfile.mCipher);
+        onPreferenceChange(mCipher, mProfile.mCipher);
+        mAuth.setText(mProfile.mAuth);
+        onPreferenceChange(mAuth, mProfile.mAuth);
 
         if (mProfile.mAuthenticationType == VpnProfile.TYPE_STATICKEYS) {
             mExpectTLSCert.setEnabled(false);
@@ -104,47 +111,46 @@ public class Settings_Authentication extends OpenVpnPreferencesFragment implemen
             mCheckRemoteCN.setEnabled(true);
 
         }
-	}
-
-	@Override
-	protected void saveSettings() {
-		mProfile.mExpectTLSCert=mExpectTLSCert.isChecked();
-		mProfile.mCheckRemoteCN=mCheckRemoteCN.isChecked();
-		mProfile.mRemoteCN=mRemoteCN.getCNText();
-		mProfile.mX509AuthType=mRemoteCN.getAuthtype();
+    }
 
-		mProfile.mUseTLSAuth = mUseTLSAuth.isChecked();
-		mProfile.mTLSAuthFilename = mTlsAuthFileData;
+    @Override
+    protected void saveSettings() {
+        mProfile.mExpectTLSCert = mExpectTLSCert.isChecked();
+        mProfile.mCheckRemoteCN = mCheckRemoteCN.isChecked();
+        mProfile.mRemoteCN = mRemoteCN.getCNText();
+        mProfile.mX509AuthType = mRemoteCN.getAuthtype();
+
+        mProfile.mUseTLSAuth = mUseTLSAuth.isChecked();
+        mProfile.mTLSAuthFilename = mTlsAuthFileData;
         mProfile.mx509UsernameField = mRemoteX509Name.getText();
 
-		if(mTLSAuthDirection.getValue()==null)
-			mProfile.mTLSAuthDirection=null;
-		else
-			mProfile.mTLSAuthDirection = mTLSAuthDirection.getValue();
-
-		if(mCipher.getText()==null)
-			mProfile.mCipher=null;
-		else
-			mProfile.mCipher = mCipher.getText();
+        if (mTLSAuthDirection.getValue() == null)
+            mProfile.mTLSAuthDirection = null;
+        else
+            mProfile.mTLSAuthDirection = mTLSAuthDirection.getValue();
 
-		if(mAuth.getText()==null)
-			mProfile.mAuth = null;
-		else
-			mProfile.mAuth = mAuth.getText();
-
-	}
+        if (mCipher.getText() == null)
+            mProfile.mCipher = null;
+        else
+            mProfile.mCipher = mCipher.getText();
 
+        if (mAuth.getText() == null)
+            mProfile.mAuth = null;
+        else
+            mProfile.mAuth = mAuth.getText();
 
+    }
 
-	@Override
-	public boolean onPreferenceChange(Preference preference, Object newValue) {
-		if(preference==mRemoteCN) {
-			@SuppressWarnings("unchecked")
-			int authtype = ((Pair<Integer, String>) newValue).first;
-			@SuppressWarnings("unchecked")
-			String dn = ((Pair<Integer, String>) newValue).second;
 
-			if ("".equals(dn)) {
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        if (preference == mRemoteCN) {
+            @SuppressWarnings("unchecked")
+            int authtype = ((Pair<Integer, String>) newValue).first;
+            @SuppressWarnings("unchecked")
+            String dn = ((Pair<Integer, String>) newValue).second;
+
+            if ("".equals(dn)) {
                 if (mProfile.mConnections.length > 0) {
                     preference.setSummary(getX509String(VpnProfile.X509_VERIFY_TLSREMOTE_RDN, mProfile.mConnections[0].mServerName));
                 } else {
@@ -154,39 +160,40 @@ public class Settings_Authentication extends OpenVpnPreferencesFragment implemen
                 preference.setSummary(getX509String(authtype, dn));
             }
 
-		} else if (preference == mCipher || preference == mAuth) {
-			preference.setSummary((CharSequence) newValue);
-		} else if (preference == mRemoteX509Name) {
-            preference.setSummary(TextUtils.isEmpty((CharSequence) newValue) ? "CN (default)" : (CharSequence)newValue);
+        } else if (preference == mCipher || preference == mAuth) {
+            preference.setSummary((CharSequence) newValue);
+        } else if (preference == mRemoteX509Name) {
+            preference.setSummary(TextUtils.isEmpty((CharSequence) newValue) ? "CN (default)" : (CharSequence) newValue);
+        }
+        return true;
+    }
+
+    private CharSequence getX509String(int authtype, String dn) {
+        String ret = "";
+        switch (authtype) {
+            case VpnProfile.X509_VERIFY_TLSREMOTE:
+            case VpnProfile.X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING:
+                ret += "tls-remote ";
+                break;
+
+            case VpnProfile.X509_VERIFY_TLSREMOTE_DN:
+                ret = "dn: ";
+                break;
+
+            case VpnProfile.X509_VERIFY_TLSREMOTE_RDN:
+                ret = "rdn: ";
+                break;
+
+            case VpnProfile.X509_VERIFY_TLSREMOTE_RDN_PREFIX:
+                ret = "rdn prefix: ";
+                break;
         }
-		return true;
-	}
-	private CharSequence getX509String(int authtype, String dn) {
-		String ret ="";
-		switch (authtype) {
-		case VpnProfile.X509_VERIFY_TLSREMOTE:
-		case VpnProfile.X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING:
-			ret+="tls-remote ";
-			break;
-
-		case VpnProfile.X509_VERIFY_TLSREMOTE_DN:
-			ret="dn: ";
-			break;
-
-		case VpnProfile.X509_VERIFY_TLSREMOTE_RDN:
-			ret="rdn: ";
-			break;
-
-		case VpnProfile.X509_VERIFY_TLSREMOTE_RDN_PREFIX:
-			ret="rdn prefix: ";
-			break;
-		}
-		return ret + dn;
-	}
+        return ret + dn;
+    }
 
     void startFileDialog() {
         Intent startFC = null;
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && ! Utils.alwaysUseOldFileChooser(getActivity())) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && !Utils.alwaysUseOldFileChooser(getActivity())) {
             startFC = Utils.getFilePickerIntent(getActivity(), Utils.FileType.TLS_AUTH_FILE);
             startActivityForResult(startFC, SELECT_TLS_FILE_KITKAT);
         }
@@ -200,22 +207,22 @@ public class Settings_Authentication extends OpenVpnPreferencesFragment implemen
     }
 
     @Override
-	public boolean onPreferenceClick(Preference preference) {
-		startFileDialog();
-		return true;
-
-	}
-
-	@Override
-	public void onActivityResult(int requestCode, int resultCode, Intent data) {
-		super.onActivityResult(requestCode, resultCode, data);
-		if(requestCode == SELECT_TLS_FILE_LEGACY_DIALOG && resultCode == Activity.RESULT_OK){
-			String result = data.getStringExtra(FileSelect.RESULT_DATA);
-			mTlsAuthFileData=result;
-			setTlsAuthSummary(result);
-		}  else if (requestCode == SELECT_TLS_FILE_KITKAT && resultCode == Activity.RESULT_OK) {
+    public boolean onPreferenceClick(Preference preference) {
+        startFileDialog();
+        return true;
+
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (requestCode == SELECT_TLS_FILE_LEGACY_DIALOG && resultCode == Activity.RESULT_OK) {
+            String result = data.getStringExtra(FileSelect.RESULT_DATA);
+            mTlsAuthFileData = result;
+            setTlsAuthSummary(result);
+        } else if (requestCode == SELECT_TLS_FILE_KITKAT && resultCode == Activity.RESULT_OK) {
             try {
-                mTlsAuthFileData= Utils.getFilePickerResult(Utils.FileType.TLS_AUTH_FILE,data,getActivity());
+                mTlsAuthFileData = Utils.getFilePickerResult(Utils.FileType.TLS_AUTH_FILE, data, getActivity());
                 setTlsAuthSummary(mTlsAuthFileData);
             } catch (IOException e) {
                 VpnStatus.logException(e);
@@ -223,16 +230,31 @@ public class Settings_Authentication extends OpenVpnPreferencesFragment implemen
                 VpnStatus.logException(se);
             }
         }
-	}
+    }
 
-	private void setTlsAuthSummary(String result) {
-		if(result==null)
+    private void setTlsAuthSummary(String result) {
+        if (result == null)
             result = getString(R.string.no_certificate);
-		if(result.startsWith(VpnProfile.INLINE_TAG))
-			mTLSAuthFile.setSummary(R.string.inline_file_data);
+        if (result.startsWith(VpnProfile.INLINE_TAG))
+            mTLSAuthFile.setSummary(R.string.inline_file_data);
         else if (result.startsWith(VpnProfile.DISPLAYNAME_TAG))
-			mTLSAuthFile.setSummary(getString(R.string.imported_from_file, VpnProfile.getDisplayName(result)));
-		else
-			mTLSAuthFile.setSummary(result);
-	}
+            mTLSAuthFile.setSummary(getString(R.string.imported_from_file, VpnProfile.getDisplayName(result)));
+        else
+            mTLSAuthFile.setSummary(result);
+    }
+
+    @Override
+    public void onDisplayPreferenceDialog(Preference preference) {
+        DialogFragment dialogFragment = null;
+        if (preference instanceof RemoteCNPreference) {
+            dialogFragment = RemoteCNPreferenceDialog.newInstance(preference.getKey());
+        }
+
+        if (dialogFragment != null) {
+            dialogFragment.setTargetFragment(this, 0);
+            dialogFragment.show(requireFragmentManager(), "RemoteCNDialog");
+        } else {
+            super.onDisplayPreferenceDialog(preference);
+        }
+    }
 }
\ No newline at end of file
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Fragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Fragment.java
index 738bd0e9..f29f2063 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Fragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Fragment.java
@@ -5,9 +5,10 @@
 
 package de.blinkt.openvpn.fragments;
 
-import android.app.Fragment;
 import android.os.Bundle;
 
+import androidx.fragment.app.Fragment;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ProfileManager;
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_IP.java b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_IP.java
index bd2ad5f2..843ff750 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_IP.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_IP.java
@@ -4,17 +4,19 @@
  */
 
 package de.blinkt.openvpn.fragments;
+
 import android.os.Bundle;
-import android.preference.CheckBoxPreference;
-import android.preference.EditTextPreference;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceChangeListener;
-import android.preference.PreferenceManager;
-import android.preference.SwitchPreference;
+
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.EditTextPreference;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceManager;
+import androidx.preference.SwitchPreference;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.VpnProfile;
 
-public class Settings_IP extends OpenVpnPreferencesFragment implements OnPreferenceChangeListener {
+public class Settings_IP extends OpenVpnPreferencesFragment implements Preference.OnPreferenceChangeListener {
 		private EditTextPreference mIPv4;
 		private EditTextPreference mIPv6;
 		private SwitchPreference mUsePull;
@@ -33,19 +35,19 @@ public class Settings_IP extends OpenVpnPreferencesFragment implements OnPrefere
 			// Make sure default values are applied.  In a real app, you would
 			// want this in a shared function that is used to retrieve the
 			// SharedPreferences wherever they are needed.
-			PreferenceManager.setDefaultValues(getActivity(),
+			PreferenceManager.setDefaultValues(requireActivity(),
 					R.xml.vpn_ipsettings, false);
 
 			// Load the preferences from an XML resource
 			addPreferencesFromResource(R.xml.vpn_ipsettings);
-			mIPv4 = (EditTextPreference) findPreference("ipv4_address");
-			mIPv6 = (EditTextPreference) findPreference("ipv6_address");
-			mUsePull = (SwitchPreference) findPreference("usePull");
-			mOverrideDNS = (CheckBoxPreference) findPreference("overrideDNS");
-			mSearchdomain =(EditTextPreference) findPreference("searchdomain");
-			mDNS1 = (EditTextPreference) findPreference("dns1");
-			mDNS2 = (EditTextPreference) findPreference("dns2");
-			mNobind = (CheckBoxPreference) findPreference("nobind");
+			mIPv4 = findPreference("ipv4_address");
+			mIPv6 = findPreference("ipv6_address");
+			mUsePull = findPreference("usePull");
+			mOverrideDNS = findPreference("overrideDNS");
+			mSearchdomain = findPreference("searchdomain");
+			mDNS1 = findPreference("dns1");
+			mDNS2 = findPreference("dns2");
+			mNobind = findPreference("nobind");
 
 			mIPv4.setOnPreferenceChangeListener(this);
 			mIPv6.setOnPreferenceChangeListener(this);
@@ -141,4 +143,8 @@ public class Settings_IP extends OpenVpnPreferencesFragment implements OnPrefere
 		}
 
 
-	}
\ No newline at end of file
+	@Override
+	public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+
+	}
+}
\ No newline at end of file
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Obscure.java b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Obscure.java
index 6674599d..4b1db582 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Obscure.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Obscure.java
@@ -6,19 +6,20 @@
 package de.blinkt.openvpn.fragments;
 
 import android.os.Bundle;
-import android.preference.CheckBoxPreference;
-import android.preference.EditTextPreference;
-import android.preference.ListPreference;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceChangeListener;
 import android.widget.Toast;
 
+
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.EditTextPreference;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+
 import java.util.Locale;
 
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.VpnProfile;
 
-public class Settings_Obscure extends OpenVpnPreferencesFragment implements OnPreferenceChangeListener {
+public class Settings_Obscure extends OpenVpnPreferencesFragment implements Preference.OnPreferenceChangeListener {
 	private CheckBoxPreference mUseRandomHostName;
 	private CheckBoxPreference mUseFloat;
 	private CheckBoxPreference mUseCustomConfig;
@@ -126,6 +127,11 @@ public class Settings_Obscure extends OpenVpnPreferencesFragment implements OnPr
 
 	}
 
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+
+    }
+
     protected void loadSettings() {
         mUseRandomHostName.setChecked(mProfile.mUseRandomHostname);
         mUseFloat.setChecked(mProfile.mUseFloat);
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Routing.java b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Routing.java
index 91a41ef3..6b963bb8 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Routing.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/Settings_Routing.java
@@ -6,14 +6,15 @@
 package de.blinkt.openvpn.fragments;
 import android.os.Build;
 import android.os.Bundle;
-import android.preference.CheckBoxPreference;
-import android.preference.EditTextPreference;
-import android.preference.Preference;
-import android.preference.Preference.OnPreferenceChangeListener;
+
+import androidx.preference.CheckBoxPreference;
+import androidx.preference.EditTextPreference;
+import androidx.preference.Preference;
+
 import de.blinkt.openvpn.R;
 
 
-public class Settings_Routing extends OpenVpnPreferencesFragment implements OnPreferenceChangeListener {
+public class Settings_Routing extends OpenVpnPreferencesFragment implements Preference.OnPreferenceChangeListener {
 	private EditTextPreference mCustomRoutes;
 	private CheckBoxPreference mUseDefaultRoute;
 	private EditTextPreference mCustomRoutesv6;
@@ -30,17 +31,17 @@ public class Settings_Routing extends OpenVpnPreferencesFragment implements OnPr
 
 		// Load the preferences from an XML resource
 		addPreferencesFromResource(R.xml.vpn_routing);
-        mCustomRoutes = (EditTextPreference) findPreference("customRoutes");
-		mUseDefaultRoute = (CheckBoxPreference) findPreference("useDefaultRoute");
-		mCustomRoutesv6 = (EditTextPreference) findPreference("customRoutesv6");
-		mUseDefaultRoutev6 = (CheckBoxPreference) findPreference("useDefaultRoutev6");
-        mExcludedRoutes = (EditTextPreference) findPreference("excludedRoutes");
-        mExcludedRoutesv6 = (EditTextPreference) findPreference("excludedRoutesv6");
+        mCustomRoutes = findPreference("customRoutes");
+		mUseDefaultRoute = findPreference("useDefaultRoute");
+		mCustomRoutesv6 = findPreference("customRoutesv6");
+		mUseDefaultRoutev6 = findPreference("useDefaultRoutev6");
+        mExcludedRoutes = findPreference("excludedRoutes");
+        mExcludedRoutesv6 = findPreference("excludedRoutesv6");
 
-		mRouteNoPull = (CheckBoxPreference) findPreference("routenopull");
-        mLocalVPNAccess = (CheckBoxPreference) findPreference("unblockLocal");
+		mRouteNoPull = findPreference("routenopull");
+        mLocalVPNAccess = findPreference("unblockLocal");
 
-		mBlockUnusedAF = (CheckBoxPreference) findPreference("blockUnusedAF");
+		mBlockUnusedAF = findPreference("blockUnusedAF");
 
 		mCustomRoutes.setOnPreferenceChangeListener(this);
 		mCustomRoutesv6.setOnPreferenceChangeListener(this);
@@ -54,6 +55,11 @@ public class Settings_Routing extends OpenVpnPreferencesFragment implements OnPr
 		loadSettings();
 	}
 
+	@Override
+	public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+
+	}
+
 	@Override
 	protected void loadSettings() {
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/ShowConfigFragment.java b/main/src/ui/java/de/blinkt/openvpn/fragments/ShowConfigFragment.java
index f5c1750a..d69b4581 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/ShowConfigFragment.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/ShowConfigFragment.java
@@ -5,7 +5,6 @@
 
 package de.blinkt.openvpn.fragments;
 
-import android.app.Fragment;
 import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
@@ -17,6 +16,10 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageButton;
 import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+
 import de.blinkt.openvpn.R;
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ProfileManager;
@@ -30,17 +33,12 @@ public class ShowConfigFragment extends Fragment {
 	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
 	{
 		View v=inflater.inflate(R.layout.viewconfig, container,false);
-		mConfigView = (TextView) v.findViewById(R.id.configview);
+		mConfigView = v.findViewById(R.id.configview);
 
 
-		mfabButton = (ImageButton) v.findViewById(R.id.share_config);
+		mfabButton = v.findViewById(R.id.share_config);
         if (mfabButton!=null) {
-			mfabButton.setOnClickListener(new View.OnClickListener() {
-				@Override
-				public void onClick(View v) {
-					shareConfig();
-				}
-			});
+			mfabButton.setOnClickListener(v1 -> shareConfig());
 			mfabButton.setVisibility(View.INVISIBLE);
 		}
 		return v;
@@ -53,12 +51,12 @@ public class ShowConfigFragment extends Fragment {
 				/* Add a few newlines to make the textview scrollable past the FAB */
 				try {
 
-					configtext = vp.getConfigFile(getActivity(), VpnProfile.doUseOpenVPN3(getActivity())) + "\n\n\n";
+					configtext = vp.getConfigFile(requireContext(), VpnProfile.doUseOpenVPN3(getActivity())) + "\n\n\n";
 				} catch (Exception e) {
 					e.printStackTrace();
 					configtext = "Error generating config file: " + e.getLocalizedMessage();
 				}
-				getActivity().runOnUiThread(() -> {
+				requireActivity().runOnUiThread(() -> {
                     cv.setText(configtext);
 					if (mfabButton!=null)
                         mfabButton.setVisibility(View.VISIBLE);
@@ -76,7 +74,7 @@ public class ShowConfigFragment extends Fragment {
 	}
 
 	@Override
-	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+	public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
 		    inflater.inflate(R.menu.configmenu, menu);
 	}
@@ -108,7 +106,7 @@ public class ShowConfigFragment extends Fragment {
     }
 
 	private void populateConfigText() {
-		String profileUUID = getArguments().getString(getActivity().getPackageName() + ".profileUUID");
+		String profileUUID = requireArguments().getString(requireActivity().getPackageName() + ".profileUUID");
 		final VpnProfile vp = ProfileManager.get(getActivity(),profileUUID);
 		int check=vp.checkProfile(getActivity());
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/fragments/VPNProfileList.java b/main/src/ui/java/de/blinkt/openvpn/fragments/VPNProfileList.java
index c1aadb7e..eaccd201 100644
--- a/main/src/ui/java/de/blinkt/openvpn/fragments/VPNProfileList.java
+++ b/main/src/ui/java/de/blinkt/openvpn/fragments/VPNProfileList.java
@@ -8,7 +8,6 @@ package de.blinkt.openvpn.fragments;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.AlertDialog;
-import android.app.ListFragment;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -21,6 +20,8 @@ import android.os.Build;
 import android.os.Bundle;
 import android.os.PersistableBundle;
 import androidx.annotation.RequiresApi;
+import androidx.fragment.app.ListFragment;
+
 import android.text.Html;
 import android.text.Html.ImageGetter;
 import android.view.LayoutInflater;
@@ -76,12 +77,9 @@ public class VPNProfileList extends ListFragment implements OnClickListener, Vpn
 
     @Override
     public void updateState(String state, String logmessage, final int localizedResId, ConnectionStatus level) {
-        getActivity().runOnUiThread(new Runnable() {
-            @Override
-            public void run() {
-                mLastStatusMessage = VpnStatus.getLastCleanLogMessage(getActivity());
-                mArrayadapter.notifyDataSetChanged();
-            }
+        getActivity().runOnUiThread(() -> {
+            mLastStatusMessage = VpnStatus.getLastCleanLogMessage(getActivity());
+            mArrayadapter.notifyDataSetChanged();
         });
     }
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/DefaultVPNListPreference.java b/main/src/ui/java/de/blinkt/openvpn/views/DefaultVPNListPreference.java
index e8328f5c..46722e03 100644
--- a/main/src/ui/java/de/blinkt/openvpn/views/DefaultVPNListPreference.java
+++ b/main/src/ui/java/de/blinkt/openvpn/views/DefaultVPNListPreference.java
@@ -6,8 +6,10 @@
 package de.blinkt.openvpn.views;
 
 import android.content.Context;
-import android.preference.ListPreference;
 import android.util.AttributeSet;
+
+import androidx.preference.ListPreference;
+
 import de.blinkt.openvpn.VpnProfile;
 import de.blinkt.openvpn.core.ProfileManager;
 
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/PagerSlidingTabStrip.java b/main/src/ui/java/de/blinkt/openvpn/views/PagerSlidingTabStrip.java
deleted file mode 100644
index 3232edc6..00000000
--- a/main/src/ui/java/de/blinkt/openvpn/views/PagerSlidingTabStrip.java
+++ /dev/null
@@ -1,732 +0,0 @@
-/*
- * Copyright (C) 2013 Andreas Stuetz <andreas.stuetz@gmail.com>
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package de.blinkt.openvpn.views;
-
-import android.annotation.SuppressLint;
-import android.content.Context;
-import android.content.res.ColorStateList;
-import android.content.res.TypedArray;
-import android.database.DataSetObserver;
-import android.graphics.Canvas;
-import android.graphics.Paint;
-import android.graphics.Paint.Style;
-import android.graphics.Typeface;
-import android.os.Build;
-import android.os.Parcel;
-import android.os.Parcelable;
-import androidx.core.view.ViewCompat;
-import android.support.v4n.view.ViewPager;
-import android.util.AttributeSet;
-import android.util.DisplayMetrics;
-import android.util.Pair;
-import android.util.TypedValue;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.ViewTreeObserver.OnGlobalLayoutListener;
-import android.widget.HorizontalScrollView;
-import android.widget.LinearLayout;
-import android.widget.TextView;
-
-
-import java.util.Locale;
-
-import de.blinkt.openvpn.R;
-
-public class PagerSlidingTabStrip extends HorizontalScrollView implements TabBarView {
-
-    private static final float OPAQUE = 1.0f;
-    private static final float HALF_TRANSP = 0.5f;
-
-    public interface CustomTabProvider {
-        public View getCustomTabView(ViewGroup parent, int position);
-    }
-
-    // @formatter:off
-    private static final int[] ATTRS = new int[]{
-            android.R.attr.textSize,
-            android.R.attr.textColor,
-            android.R.attr.paddingLeft,
-            android.R.attr.paddingRight,
-    };
-    // @formatter:on
-
-    private final PagerAdapterObserver adapterObserver = new PagerAdapterObserver();
-
-    //These indexes must be related with the ATTR array above
-    private static final int TEXT_SIZE_INDEX = 0;
-    private static final int TEXT_COLOR_INDEX = 1;
-    private static final int PADDING_LEFT_INDEX = 2;
-    private static final int PADDING_RIGHT_INDEX = 3;
-
-    private LinearLayout.LayoutParams defaultTabLayoutParams;
-    private LinearLayout.LayoutParams expandedTabLayoutParams;
-
-    private final PageListener pageListener = new PageListener();
-    public ViewPager.OnPageChangeListener delegatePageListener;
-
-    private LinearLayout tabsContainer;
-    private ViewPager pager;
-
-    private int tabCount;
-
-    private int currentPosition = 0;
-    private float currentPositionOffset = 0f;
-
-    private Paint rectPaint;
-    private Paint dividerPaint;
-
-    private int indicatorColor;
-    private int indicatorHeight = 2;
-
-    private int underlineHeight = 0;
-    private int underlineColor;
-
-    private int dividerWidth = 0;
-    private int dividerPadding = 0;
-    private int dividerColor;
-
-    private int tabPadding = 12;
-    private int tabTextSize = 14;
-    private ColorStateList tabTextColor = null;
-    private float tabTextAlpha = HALF_TRANSP;
-    private float tabTextSelectedAlpha = OPAQUE;
-
-    private int paddingLeft = 0;
-    private int paddingRight = 0;
-
-    private boolean shouldExpand = false;
-    private boolean textAllCaps = true;
-    private boolean isPaddingMiddle = false;
-
-    private Typeface tabTypeface = null;
-    private int tabTypefaceStyle = Typeface.BOLD;
-    private int tabTypefaceSelectedStyle = Typeface.BOLD;
-
-    private int scrollOffset;
-    private int lastScrollX = 0;
-
-    private int tabBackgroundResId = R.drawable.slidingtab_background;
-
-    private Locale locale;
-
-    public PagerSlidingTabStrip(Context context) {
-        this(context, null);
-    }
-
-    public PagerSlidingTabStrip(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) {
-        super(context, attrs, defStyle);
-        setFillViewport(true);
-        setWillNotDraw(false);
-        tabsContainer = new LinearLayout(context);
-        tabsContainer.setOrientation(LinearLayout.HORIZONTAL);
-        tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
-        addView(tabsContainer);
-
-        //Default color will be 'textColorPrimary'
-        int colorPrimary = context.getResources().getColor(android.R.color.primary_text_dark);
-        setTextColor(colorPrimary);
-        underlineColor = colorPrimary;
-        dividerColor = colorPrimary;
-        indicatorColor = colorPrimary;
-
-
-        DisplayMetrics dm = getResources().getDisplayMetrics();
-        scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);
-        indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm);
-        underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, underlineHeight, dm);
-        dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm);
-        tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm);
-        dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm);
-        tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm);
-
-        // get system attrs (android:textSize and android:textColor)
-        TypedArray a = context.obtainStyledAttributes(attrs, ATTRS);
-        tabTextSize = a.getDimensionPixelSize(TEXT_SIZE_INDEX, tabTextSize);
-        ColorStateList colorStateList = a.getColorStateList(TEXT_COLOR_INDEX);
-        if (colorStateList != null) {
-            tabTextColor = colorStateList;
-        }
-        paddingLeft = a.getDimensionPixelSize(PADDING_LEFT_INDEX, paddingLeft);
-        paddingRight = a.getDimensionPixelSize(PADDING_RIGHT_INDEX, paddingRight);
-        a.recycle();
-
-        //In case we have the padding they must be equal so we take the biggest
-        if (paddingRight < paddingLeft) {
-            paddingRight = paddingLeft;
-        }
-
-        if (paddingLeft < paddingRight) {
-            paddingLeft = paddingRight;
-        }
-
-        // get custom attrs
-        a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip);
-        indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor);
-        underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor);
-        dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor);
-        dividerWidth = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerWidth, dividerWidth);
-        indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight);
-        underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight);
-        dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding);
-        tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding);
-        tabBackgroundResId = a.getResourceId(R.styleable.PagerSlidingTabStrip_pstsTabBackground, tabBackgroundResId);
-        shouldExpand = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsShouldExpand, shouldExpand);
-        scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset);
-        textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps);
-        isPaddingMiddle = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsPaddingMiddle, isPaddingMiddle);
-        tabTypefaceStyle = a.getInt(R.styleable.PagerSlidingTabStrip_pstsTextStyle, Typeface.BOLD);
-        tabTypefaceSelectedStyle = a.getInt(R.styleable.PagerSlidingTabStrip_pstsTextSelectedStyle, Typeface.BOLD);
-        tabTextAlpha = a.getFloat(R.styleable.PagerSlidingTabStrip_pstsTextAlpha, HALF_TRANSP);
-        tabTextSelectedAlpha = a.getFloat(R.styleable.PagerSlidingTabStrip_pstsTextSelectedAlpha, OPAQUE);
-        a.recycle();
-
-        rectPaint = new Paint();
-        rectPaint.setAntiAlias(true);
-        rectPaint.setStyle(Style.FILL);
-
-
-        dividerPaint = new Paint();
-        dividerPaint.setAntiAlias(true);
-        dividerPaint.setStrokeWidth(dividerWidth);
-
-        defaultTabLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
-        expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f);
-
-        if (locale == null) {
-            locale = getResources().getConfiguration().locale;
-        }
-    }
-
-    public void setViewPager(ViewPager pager) {
-        this.pager = pager;
-        if (pager.getAdapter() == null) {
-            throw new IllegalStateException("ViewPager does not have adapter instance.");
-        }
-
-        pager.setOnPageChangeListener(pageListener);
-        pager.getAdapter().registerDataSetObserver(adapterObserver);
-        adapterObserver.setAttached(true);
-        notifyDataSetChanged();
-    }
-
-    public void notifyDataSetChanged() {
-        tabsContainer.removeAllViews();
-        tabCount = pager.getAdapter().getCount();
-        View tabView;
-        for (int i = 0; i < tabCount; i++) {
-
-            if (pager.getAdapter() instanceof CustomTabProvider) {
-                tabView = ((CustomTabProvider) pager.getAdapter()).getCustomTabView(this, i);
-            } else {
-                tabView = LayoutInflater.from(getContext()).inflate(R.layout.padersliding_tab, this, false);
-            }
-
-            CharSequence title = pager.getAdapter().getPageTitle(i);
-
-            addTab(i, title, tabView);
-        }
-
-        updateTabStyles();
-        getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
-
-            @SuppressWarnings("deprecation")
-            @SuppressLint("NewApi")
-            @Override
-            public void onGlobalLayout() {
-
-                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
-                    getViewTreeObserver().removeGlobalOnLayoutListener(this);
-                } else {
-                    getViewTreeObserver().removeOnGlobalLayoutListener(this);
-                }
-
-                currentPosition = pager.getCurrentItem();
-                currentPositionOffset = 0f;
-                scrollToChild(currentPosition, 0);
-                updateSelection(currentPosition);
-            }
-        });
-    }
-
-    private void addTab(final int position, CharSequence title, View tabView) {
-        TextView textView = (TextView) tabView.findViewById(R.id.tab_title);
-        if (textView != null) {
-            if (title != null) textView.setText(title);
-            float alpha = pager.getCurrentItem() == position ? tabTextSelectedAlpha : tabTextAlpha;
-            ViewCompat.setAlpha(textView, alpha);
-        }
-
-        tabView.setFocusable(true);
-        tabView.setOnClickListener(new OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                if (pager.getCurrentItem() != position) {
-                    View tab = tabsContainer.getChildAt(pager.getCurrentItem());
-                    notSelected(tab);
-                    pager.setCurrentItem(position);
-                }
-            }
-        });
-
-        tabView.setPadding(tabPadding, tabView.getPaddingTop(), tabPadding, tabView.getPaddingBottom());
-        tabsContainer.addView(tabView, position, shouldExpand ? expandedTabLayoutParams : defaultTabLayoutParams);
-    }
-
-    private void updateTabStyles() {
-        for (int i = 0; i < tabCount; i++) {
-            View v = tabsContainer.getChildAt(i);
-            v.setBackgroundResource(tabBackgroundResId);
-            TextView tab_title = (TextView) v.findViewById(R.id.tab_title);
-
-            if (tab_title != null) {
-                tab_title.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize);
-                tab_title.setTypeface(tabTypeface, pager.getCurrentItem() == i ? tabTypefaceSelectedStyle : tabTypefaceStyle);
-                if (tabTextColor != null) {
-                    tab_title.setTextColor(tabTextColor);
-                }
-                // setAllCaps() is only available from API 14, so the upper case is made manually if we are on a
-                // pre-ICS-build
-                if (textAllCaps) {
-                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
-                        tab_title.setAllCaps(true);
-                    } else {
-                        tab_title.setText(tab_title.getText().toString().toUpperCase(locale));
-                    }
-                }
-            }
-        }
-
-    }
-
-    private void scrollToChild(int position, int offset) {
-        if (tabCount == 0) {
-            return;
-        }
-
-        int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;
-        if (position > 0 || offset > 0) {
-
-            //Half screen offset.
-            //- Either tabs start at the middle of the view scrolling straight away
-            //- Or tabs start at the begging (no padding) scrolling when indicator gets
-            //  to the middle of the view width
-            newScrollX -= scrollOffset;
-            Pair<Float, Float> lines = getIndicatorCoordinates();
-            newScrollX += ((lines.second - lines.first) / 2);
-        }
-
-        if (newScrollX != lastScrollX) {
-            lastScrollX = newScrollX;
-            scrollTo(newScrollX, 0);
-        }
-    }
-
-    private Pair<Float, Float> getIndicatorCoordinates() {
-        // default: line below current tab
-        View currentTab = tabsContainer.getChildAt(currentPosition);
-        float lineLeft = currentTab.getLeft();
-        float lineRight = currentTab.getRight();
-
-        // if there is an offset, start interpolating left and right coordinates between current and next tab
-        if (currentPositionOffset > 0f && currentPosition < tabCount - 1) {
-
-            View nextTab = tabsContainer.getChildAt(currentPosition + 1);
-            final float nextTabLeft = nextTab.getLeft();
-            final float nextTabRight = nextTab.getRight();
-
-            lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft);
-            lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight);
-        }
-        return new Pair<Float, Float>(lineLeft, lineRight);
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        super.onDraw(canvas);
-        if (isInEditMode() || tabCount == 0) {
-            return;
-        }
-
-        final int height = getHeight();
-        // draw indicator line
-        rectPaint.setColor(indicatorColor);
-        Pair<Float, Float> lines = getIndicatorCoordinates();
-        canvas.drawRect(lines.first + paddingLeft, height - indicatorHeight, lines.second + paddingRight, height, rectPaint);
-        // draw underline
-        rectPaint.setColor(underlineColor);
-        canvas.drawRect(paddingLeft, height - underlineHeight, tabsContainer.getWidth() + paddingRight, height, rectPaint);
-        // draw divider
-        if (dividerWidth != 0) {
-            dividerPaint.setStrokeWidth(dividerWidth);
-            dividerPaint.setColor(dividerColor);
-            for (int i = 0; i < tabCount - 1; i++) {
-                View tab = tabsContainer.getChildAt(i);
-                canvas.drawLine(tab.getRight(), dividerPadding, tab.getRight(), height - dividerPadding, dividerPaint);
-            }
-        }
-    }
-
-    @Override
-    protected void onLayout(boolean changed, int l, int t, int r, int b) {
-        if (isPaddingMiddle) {
-            //Make sure tabContainer is bigger than the HorizontalScrollView to be able to scroll
-            tabsContainer.setMinimumWidth(getWidth());
-            int halfFirstTab = 0;
-            if (tabsContainer.getChildCount() > 0) {
-                halfFirstTab = (tabsContainer.getChildAt(0).getWidth() / 2);
-            }
-            //The user choose the tabs to start in the middle of the view width (padding)
-            paddingLeft = paddingRight = getWidth() / 2 - halfFirstTab;
-            //Clipping padding to false to see the tabs while we pass them swiping
-            setClipToPadding(false);
-        }
-
-        if (scrollOffset == 0) scrollOffset = getWidth() / 2 - paddingLeft;
-        setPadding(paddingLeft, getPaddingTop(), paddingRight, getPaddingBottom());
-        super.onLayout(changed, l, t, r, b);
-    }
-
-    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
-        this.delegatePageListener = listener;
-    }
-
-    private class PageListener implements ViewPager.OnPageChangeListener {
-
-        @Override
-        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
-            currentPosition = position;
-            currentPositionOffset = positionOffset;
-            int offset = tabCount > 0 ? (int) (positionOffset * tabsContainer.getChildAt(position).getWidth()) : 0;
-            scrollToChild(position, offset);
-            invalidate();
-            if (delegatePageListener != null) {
-                delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
-            }
-        }
-
-        @Override
-        public void onPageScrollStateChanged(int state) {
-            if (state == ViewPager.SCROLL_STATE_IDLE) {
-                scrollToChild(pager.getCurrentItem(), 0);
-            }
-            //Full alpha for current item
-            View currentTab = tabsContainer.getChildAt(pager.getCurrentItem());
-            selected(currentTab);
-            //Half transparent for prev item
-            if (pager.getCurrentItem() - 1 >= 0) {
-                View prevTab = tabsContainer.getChildAt(pager.getCurrentItem() - 1);
-                notSelected(prevTab);
-            }
-            //Half transparent for next item
-            if (pager.getCurrentItem() + 1 <= pager.getAdapter().getCount() - 1) {
-                View nextTab = tabsContainer.getChildAt(pager.getCurrentItem() + 1);
-                notSelected(nextTab);
-            }
-
-            if (delegatePageListener != null) {
-                delegatePageListener.onPageScrollStateChanged(state);
-            }
-        }
-
-        @Override
-        public void onPageSelected(int position) {
-            updateSelection(position);
-            if (delegatePageListener != null) {
-                delegatePageListener.onPageSelected(position);
-            }
-        }
-
-    }
-
-    private void updateSelection(int position) {
-        for (int i = 0; i < tabCount; ++i) {
-            View tv = tabsContainer.getChildAt(i);
-            tv.setSelected(i == position);
-        }
-    }
-
-    private void notSelected(View tab) {
-        TextView title = (TextView) tab.findViewById(R.id.tab_title);
-        if (title != null) {
-            title.setTypeface(tabTypeface, tabTypefaceStyle);
-            ViewCompat.setAlpha(title, tabTextAlpha);
-        }
-    }
-
-    private void selected(View tab) {
-        TextView title = (TextView) tab.findViewById(R.id.tab_title);
-        if (title != null) {
-            title.setTypeface(tabTypeface, tabTypefaceSelectedStyle);
-            ViewCompat.setAlpha(title, tabTextSelectedAlpha);
-        }
-    }
-
-    private class PagerAdapterObserver extends DataSetObserver {
-
-        private boolean attached = false;
-
-        @Override
-        public void onChanged() {
-            notifyDataSetChanged();
-        }
-
-        public void setAttached(boolean attached) {
-            this.attached = attached;
-        }
-
-        public boolean isAttached() {
-            return attached;
-        }
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        super.onAttachedToWindow();
-        if (pager != null) {
-            if (!adapterObserver.isAttached()) {
-                pager.getAdapter().registerDataSetObserver(adapterObserver);
-                adapterObserver.setAttached(true);
-            }
-        }
-    }
-
-    @Override
-    protected void onDetachedFromWindow() {
-        super.onDetachedFromWindow();
-        if (pager != null) {
-            if (adapterObserver.isAttached()) {
-                pager.getAdapter().unregisterDataSetObserver(adapterObserver);
-                adapterObserver.setAttached(false);
-            }
-        }
-    }
-
-    @Override
-    public void onRestoreInstanceState(Parcelable state) {
-        SavedState savedState = (SavedState) state;
-        super.onRestoreInstanceState(savedState.getSuperState());
-        currentPosition = savedState.currentPosition;
-        if (currentPosition != 0 && tabsContainer.getChildCount() > 0) {
-            notSelected(tabsContainer.getChildAt(0));
-            selected(tabsContainer.getChildAt(currentPosition));
-        }
-        requestLayout();
-    }
-
-    @Override
-    public Parcelable onSaveInstanceState() {
-        Parcelable superState = super.onSaveInstanceState();
-        SavedState savedState = new SavedState(superState);
-        savedState.currentPosition = currentPosition;
-        return savedState;
-    }
-
-    static class SavedState extends BaseSavedState {
-        int currentPosition;
-
-        public SavedState(Parcelable superState) {
-            super(superState);
-        }
-
-        private SavedState(Parcel in) {
-            super(in);
-            currentPosition = in.readInt();
-        }
-
-        @Override
-        public void writeToParcel(Parcel dest, int flags) {
-            super.writeToParcel(dest, flags);
-            dest.writeInt(currentPosition);
-        }
-
-        public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
-            @Override
-            public SavedState createFromParcel(Parcel in) {
-                return new SavedState(in);
-            }
-
-            @Override
-            public SavedState[] newArray(int size) {
-                return new SavedState[size];
-            }
-        };
-    }
-
-    public int getIndicatorColor() {
-        return this.indicatorColor;
-    }
-
-    public int getIndicatorHeight() {
-        return indicatorHeight;
-    }
-
-    public int getUnderlineColor() {
-        return underlineColor;
-    }
-
-    public int getDividerColor() {
-        return dividerColor;
-    }
-
-    public int getDividerWidth() {
-        return dividerWidth;
-    }
-
-    public int getUnderlineHeight() {
-        return underlineHeight;
-    }
-
-    public int getDividerPadding() {
-        return dividerPadding;
-    }
-
-    public int getScrollOffset() {
-        return scrollOffset;
-    }
-
-    public boolean getShouldExpand() {
-        return shouldExpand;
-    }
-
-    public int getTextSize() {
-        return tabTextSize;
-    }
-
-    public boolean isTextAllCaps() {
-        return textAllCaps;
-    }
-
-    public ColorStateList getTextColor() {
-        return tabTextColor;
-    }
-
-    public int getTabBackground() {
-        return tabBackgroundResId;
-    }
-
-    public int getTabPaddingLeftRight() {
-        return tabPadding;
-    }
-
-    public void setIndicatorColor(int indicatorColor) {
-        this.indicatorColor = indicatorColor;
-        invalidate();
-    }
-
-    public void setIndicatorColorResource(int resId) {
-        this.indicatorColor = getResources().getColor(resId);
-        invalidate();
-    }
-
-    public void setIndicatorHeight(int indicatorLineHeightPx) {
-        this.indicatorHeight = indicatorLineHeightPx;
-        invalidate();
-    }
-
-    public void setUnderlineColor(int underlineColor) {
-        this.underlineColor = underlineColor;
-        invalidate();
-    }
-
-    public void setUnderlineColorResource(int resId) {
-        this.underlineColor = getResources().getColor(resId);
-        invalidate();
-    }
-
-    public void setDividerColor(int dividerColor) {
-        this.dividerColor = dividerColor;
-        invalidate();
-    }
-
-    public void setDividerColorResource(int resId) {
-        this.dividerColor = getResources().getColor(resId);
-        invalidate();
-    }
-
-    public void setDividerWidth(int dividerWidthPx) {
-        this.dividerWidth = dividerWidthPx;
-        invalidate();
-    }
-
-    public void setUnderlineHeight(int underlineHeightPx) {
-        this.underlineHeight = underlineHeightPx;
-        invalidate();
-    }
-
-    public void setDividerPadding(int dividerPaddingPx) {
-        this.dividerPadding = dividerPaddingPx;
-        invalidate();
-    }
-
-    public void setScrollOffset(int scrollOffsetPx) {
-        this.scrollOffset = scrollOffsetPx;
-        invalidate();
-    }
-
-    public void setShouldExpand(boolean shouldExpand) {
-        this.shouldExpand = shouldExpand;
-        if (pager != null) {
-            requestLayout();
-        }
-    }
-
-    public void setAllCaps(boolean textAllCaps) {
-        this.textAllCaps = textAllCaps;
-    }
-
-    public void setTextSize(int textSizePx) {
-        this.tabTextSize = textSizePx;
-        updateTabStyles();
-    }
-
-    public void setTextColor(int textColor) {
-        setTextColor(new ColorStateList(new int[][]{new int[]{}}, new int[]{textColor}));
-    }
-
-    public void setTextColor(ColorStateList colorStateList) {
-        this.tabTextColor = colorStateList;
-        updateTabStyles();
-    }
-
-    public void setTextColorResource(int resId) {
-        setTextColor(getResources().getColor(resId));
-    }
-
-    public void setTextColorStateListResource(int resId) {
-        setTextColor(getResources().getColorStateList(resId));
-    }
-
-    public void setTypeface(Typeface typeface, int style) {
-        this.tabTypeface = typeface;
-        this.tabTypefaceSelectedStyle = style;
-        updateTabStyles();
-    }
-
-    public void setTabBackground(int resId) {
-        this.tabBackgroundResId = resId;
-    }
-
-    public void setTabPaddingLeftRight(int paddingPx) {
-        this.tabPadding = paddingPx;
-        updateTabStyles();
-    }
-}
\ No newline at end of file
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreference.java b/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreference.java
index 4b477f9c..46c9ed48 100644
--- a/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreference.java
+++ b/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreference.java
@@ -6,141 +6,55 @@
 package de.blinkt.openvpn.views;
 
 import android.content.Context;
-import android.preference.DialogPreference;
 import android.util.AttributeSet;
-import android.util.Pair;
-import android.view.View;
-import android.widget.ArrayAdapter;
-import android.widget.EditText;
-import android.widget.Spinner;
-import android.widget.TextView;
+
+import androidx.preference.DialogPreference;
 
 import de.blinkt.openvpn.R;
-import de.blinkt.openvpn.VpnProfile;
 
 public class RemoteCNPreference extends DialogPreference {
 
 
-	private Spinner mSpinner;
-	private EditText mEditText;
-	private int mDNType;
-	private String mDn;
-	private TextView mRemoteTLSNote;
-	//private ScrollView mScrollView;
-
-	public RemoteCNPreference(Context context, AttributeSet attrs) {
-		super(context, attrs);
-		setDialogLayoutResource(R.layout.tlsremote);
-
-	}
-
-	@Override
-	protected void onBindDialogView(View view) {
-
-		super.onBindDialogView(view);
-
-		mEditText = (EditText) view.findViewById(R.id.tlsremotecn);
-		mSpinner = (Spinner) view.findViewById(R.id.x509verifytype);
-		mRemoteTLSNote = (TextView) view.findViewById(R.id.tlsremotenote);
-		//mScrollView = (ScrollView) view.findViewById(R.id.tlsremotescroll);
-		if(mDn!=null)
-			mEditText.setText(mDn);
-
-		populateSpinner();
-
-	}
-
-
-
-	public String getCNText() {
-		return mDn;
-	}
-
-	public int getAuthtype() {
-		return mDNType;
-	}
-
-	public void setDN(String dn) {
-		mDn = dn;
-		if(mEditText!=null)
-			mEditText.setText(dn);
-	}
-
-	public void setAuthType(int x509authtype) {
-		mDNType = x509authtype;
-		if (mSpinner!=null)
-			populateSpinner();
-	}
-
-	@Override
-	protected void onDialogClosed(boolean positiveResult) {
-		super.onDialogClosed(positiveResult);
-
-		if (positiveResult) {
-			String dn = mEditText.getText().toString();
-			int authtype = getAuthTypeFromSpinner();
-			if (callChangeListener(new Pair<Integer, String>(authtype, dn))) {
-				mDn = dn;
-				mDNType = authtype;
-			}
-		}
-	}
-
-	private void populateSpinner() {
-		ArrayAdapter<String> authtypes = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item);
-		authtypes.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
-
-		authtypes.add(getContext().getString(R.string.complete_dn));
-		authtypes.add(getContext().getString(R.string.rdn));
-		authtypes.add(getContext().getString(R.string.rdn_prefix));
-		if ((mDNType == VpnProfile.X509_VERIFY_TLSREMOTE || mDNType == VpnProfile.X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING)
-				&& !(mDn==null || "".equals(mDn))) {
-			authtypes.add(getContext().getString(R.string.tls_remote_deprecated));
-			mRemoteTLSNote.setVisibility(View.VISIBLE);
-		} else {
-			mRemoteTLSNote.setVisibility(View.GONE);
-		}
-		mSpinner.setAdapter(authtypes);
-		mSpinner.setSelection(getSpinnerPositionFromAuthTYPE());
-	}
-
-	private int getSpinnerPositionFromAuthTYPE() {
-		switch (mDNType) {
-		case VpnProfile.X509_VERIFY_TLSREMOTE_DN:
-			return 0;
-		case VpnProfile.X509_VERIFY_TLSREMOTE_RDN:
-			return 1;
-		case VpnProfile.X509_VERIFY_TLSREMOTE_RDN_PREFIX:
-			return 2;
-		case VpnProfile.X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING:
-		case VpnProfile.X509_VERIFY_TLSREMOTE:
-			if (mDn==null || "".equals(mDn))
-				return 1;
-			else
-				return 3;
-
-
-		default:
-			return 0;
-		}
-	}
-
-	private int getAuthTypeFromSpinner() {
-		int pos = mSpinner.getSelectedItemPosition();
-		switch (pos) {
-		case 0:
-			return VpnProfile.X509_VERIFY_TLSREMOTE_DN;
-		case 1:
-			return VpnProfile.X509_VERIFY_TLSREMOTE_RDN;
-		case 2:
-			return VpnProfile.X509_VERIFY_TLSREMOTE_RDN_PREFIX;
-		case 3:
-			// This is the tls-remote entry, only visible if mDntype is a
-			// tls-remote type
-			return mDNType;
-		default:
-			return VpnProfile.X509_VERIFY_TLSREMOTE;
-		}
-	}
+    private int mDNType;
+    private String mDn;
+
+    public RemoteCNPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+
+    }
+
+    public RemoteCNPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        this(context, attrs, defStyleAttr, defStyleAttr);
+    }
+
+    public RemoteCNPreference(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public RemoteCNPreference(Context context) {
+        this(context, null);
+    }
+
+
+    public void setDN(String dn) {
+        mDn = dn;
+    }
+
+
+    public void setAuthType(int x509authtype) {
+        mDNType = x509authtype;
+    }
+
+    public String getCNText() {
+        return mDn;
+    }
+
+    public int getAuthtype() {
+        return mDNType;
+    }
 
+    @Override
+    public int getDialogLayoutResource() {
+        return R.layout.tlsremote;
+    }
 }
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreferenceDialog.java b/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreferenceDialog.java
new file mode 100644
index 00000000..37258489
--- /dev/null
+++ b/main/src/ui/java/de/blinkt/openvpn/views/RemoteCNPreferenceDialog.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2012-2019 Arne Schwabe
+ * Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
+ */
+
+package de.blinkt.openvpn.views;
+
+import android.os.Bundle;
+import android.util.Pair;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.EditText;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import androidx.preference.PreferenceDialogFragmentCompat;
+
+import de.blinkt.openvpn.R;
+import de.blinkt.openvpn.VpnProfile;
+
+import static de.blinkt.openvpn.VpnProfile.X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING;
+
+public class RemoteCNPreferenceDialog extends PreferenceDialogFragmentCompat {
+    private Spinner mSpinner;
+    private EditText mEditText;
+    private TextView mRemoteTLSNote;
+
+    public static RemoteCNPreferenceDialog newInstance(String key) {
+        RemoteCNPreferenceDialog f = new RemoteCNPreferenceDialog();
+        Bundle args = new Bundle();
+        args.putString(ARG_KEY, key);
+        f.setArguments(args);
+        return f;
+    }
+
+    @Override
+    public void onBindDialogView(View view) {
+        String mDn = ((RemoteCNPreference) getPreference()).getCNText();
+        int mDNType = ((RemoteCNPreference) getPreference()).getAuthtype();
+
+        mEditText = view.findViewById(R.id.tlsremotecn);
+        mSpinner = view.findViewById(R.id.x509verifytype);
+        mRemoteTLSNote = view.findViewById(R.id.tlsremotenote);
+        mEditText.setText(mDn);
+
+        populateSpinner(mDn, mDNType);
+    }
+
+    private void populateSpinner(String mDn, int mDNType) {
+        ArrayAdapter<String> authtypes = new ArrayAdapter<>(requireContext(), android.R.layout.simple_spinner_item);
+        authtypes.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+
+        authtypes.add(requireContext().getString(R.string.complete_dn));
+        authtypes.add(requireContext().getString(R.string.rdn));
+        authtypes.add(requireContext().getString(R.string.rdn_prefix));
+        if ((mDNType == VpnProfile.X509_VERIFY_TLSREMOTE || mDNType == X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING)
+                && !(mDn == null || "".equals(mDn))) {
+            authtypes.add(requireContext().getString(R.string.tls_remote_deprecated));
+            mRemoteTLSNote.setVisibility(View.VISIBLE);
+        } else {
+            mRemoteTLSNote.setVisibility(View.GONE);
+        }
+        mSpinner.setAdapter(authtypes);
+        mSpinner.setSelection(getSpinnerPositionFromAuthTYPE(mDNType, mDn));
+    }
+
+    private int getSpinnerPositionFromAuthTYPE(int mDNType, String mDn) {
+        switch (mDNType) {
+            case VpnProfile.X509_VERIFY_TLSREMOTE_DN:
+                return 0;
+            case VpnProfile.X509_VERIFY_TLSREMOTE_RDN:
+                return 1;
+            case VpnProfile.X509_VERIFY_TLSREMOTE_RDN_PREFIX:
+                return 2;
+            case X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING:
+            case VpnProfile.X509_VERIFY_TLSREMOTE:
+                if (mDn == null || "".equals(mDn))
+                    return 1;
+                else
+                    return 3;
+
+
+            default:
+                return 0;
+        }
+    }
+
+
+    private int getAuthTypeFromSpinner() {
+        int pos = mSpinner.getSelectedItemPosition();
+        switch (pos) {
+            case 0:
+                return VpnProfile.X509_VERIFY_TLSREMOTE_DN;
+            case 1:
+                return VpnProfile.X509_VERIFY_TLSREMOTE_RDN;
+            case 2:
+                return VpnProfile.X509_VERIFY_TLSREMOTE_RDN_PREFIX;
+            case 3:
+                // This is the tls-remote entry, only visible if mDntype is a
+                // tls-remote type
+                return X509_VERIFY_TLSREMOTE_COMPAT_NOREMAPPING;
+            default:
+                return VpnProfile.X509_VERIFY_TLSREMOTE;
+        }
+    }
+
+
+    @Override
+    public void onDialogClosed(boolean positiveResult) {
+
+        if (positiveResult) {
+            RemoteCNPreference pref = ((RemoteCNPreference) getPreference());
+
+            String dn = mEditText.getText().toString();
+            int authtype = getAuthTypeFromSpinner();
+            if (pref.callChangeListener(new Pair<>(authtype, dn))) {
+                pref.setDN(dn);
+                pref.setAuthType(authtype);
+            }
+        }
+    }
+
+
+}
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/ScreenSlidePagerAdapter.java b/main/src/ui/java/de/blinkt/openvpn/views/ScreenSlidePagerAdapter.java
index 481e4c16..4f1150a2 100644
--- a/main/src/ui/java/de/blinkt/openvpn/views/ScreenSlidePagerAdapter.java
+++ b/main/src/ui/java/de/blinkt/openvpn/views/ScreenSlidePagerAdapter.java
@@ -5,20 +5,22 @@
 
 package de.blinkt.openvpn.views;
 
-import android.app.Fragment;
-import android.app.FragmentManager;
 import android.content.Context;
 import android.content.res.Resources;
 import android.os.Bundle;
+
+import androidx.annotation.NonNull;
 import androidx.annotation.StringRes;
-import android.support.v4n.app.FragmentStatePagerAdapter;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentPagerAdapter;
 
 import java.util.Vector;
 
 /**
 * Created by arne on 18.11.14.
 */
-public class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
+public class ScreenSlidePagerAdapter extends FragmentPagerAdapter {
 
     private final Resources res;
     private Bundle mFragmentArguments;
@@ -46,6 +48,7 @@ public class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
         res = c.getResources();
     }
 
+    @NonNull
     @Override
     public Fragment getItem(int position) {
         try {
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/SlidingTabLayout.java b/main/src/ui/java/de/blinkt/openvpn/views/SlidingTabLayout.java
deleted file mode 100644
index 51ad6933..00000000
--- a/main/src/ui/java/de/blinkt/openvpn/views/SlidingTabLayout.java
+++ /dev/null
@@ -1,314 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package de.blinkt.openvpn.views;
-
-import android.content.Context;
-import android.graphics.Typeface;
-import android.os.Build;
-import android.support.v4n.view.PagerAdapter;
-import android.support.v4n.view.ViewPager;
-import android.util.AttributeSet;
-import android.util.TypedValue;
-import android.view.Gravity;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.widget.HorizontalScrollView;
-import android.widget.TextView;
-
-/**
- * To be used with ViewPager to provide a tab indicator component which give constant feedback as to
- * the user's scroll progress.
- * <p>
- * To use the component, simply add it to your view hierarchy. Then in your
- * {@link android.app.Activity} or {@link androidx.core.app.Fragment} call
- * {@link #setViewPager(ViewPager)} providing it the ViewPager this layout is being used for.
- * <p>
- * The colors can be customized in two ways. The first and simplest is to provide an array of colors
- * via {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)}. The
- * alternative is via the {@link TabColorizer} interface which provides you complete control over
- * which color is used for any individual position.
- * <p>
- * The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)},
- * providing the layout ID of your custom layout.
- */
-public class SlidingTabLayout extends HorizontalScrollView implements TabBarView {
-
-    /**
-     * Allows complete control over the colors drawn in the tab layout. Set with
-     * {@link #setCustomTabColorizer(TabColorizer)}.
-     */
-    public interface TabColorizer {
-
-        /**
-         * @return return the color of the indicator used when {@code position} is selected.
-         */
-        int getIndicatorColor(int position);
-
-        /**
-         * @return return the color of the divider drawn to the right of {@code position}.
-         */
-        int getDividerColor(int position);
-
-    }
-
-    private static final int TITLE_OFFSET_DIPS = 24;
-    private static final int TAB_VIEW_PADDING_DIPS = 16;
-    private static final int TAB_VIEW_TEXT_SIZE_SP = 12;
-
-    private int mTitleOffset;
-
-    private int mTabViewLayoutId;
-    private int mTabViewTextViewId;
-
-    private ViewPager mViewPager;
-    private ViewPager.OnPageChangeListener mViewPagerPageChangeListener;
-
-    private final SlidingTabStrip mTabStrip;
-
-    public SlidingTabLayout(Context context) {
-        this(context, null);
-    }
-
-    public SlidingTabLayout(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) {
-        super(context, attrs, defStyle);
-
-        // Disable the Scroll Bar
-        setHorizontalScrollBarEnabled(false);
-        // Make sure that the Tab Strips fills this View
-        setFillViewport(true);
-
-        mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density);
-
-        mTabStrip = new SlidingTabStrip(context);
-        addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
-    }
-
-    /**
-     * Set the custom {@link TabColorizer} to be used.
-     *
-     * If you only require simple custmisation then you can use
-     * {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)} to achieve
-     * similar effects.
-     */
-    public void setCustomTabColorizer(TabColorizer tabColorizer) {
-        mTabStrip.setCustomTabColorizer(tabColorizer);
-    }
-
-    /**
-     * Sets the colors to be used for indicating the selected tab. These colors are treated as a
-     * circular array. Providing one color will mean that all tabs are indicated with the same color.
-     */
-    public void setSelectedIndicatorColors(int... colors) {
-        mTabStrip.setSelectedIndicatorColors(colors);
-    }
-
-    /**
-     * Sets the colors to be used for tab dividers. These colors are treated as a circular array.
-     * Providing one color will mean that all tabs are indicated with the same color.
-     */
-    public void setDividerColors(int... colors) {
-        mTabStrip.setDividerColors(colors);
-    }
-
-    /**
-     * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are
-     * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so
-     * that the layout can update it's scroll position correctly.
-     *
-     * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener)
-     */
-    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
-        mViewPagerPageChangeListener = listener;
-    }
-
-    /**
-     * Set the custom layout to be inflated for the tab views.
-     *
-     * @param layoutResId Layout id to be inflated
-     * @param textViewId id of the {@link TextView} in the inflated view
-     */
-    public void setCustomTabView(int layoutResId, int textViewId) {
-        mTabViewLayoutId = layoutResId;
-        mTabViewTextViewId = textViewId;
-    }
-
-    /**
-     * Sets the associated view pager. Note that the assumption here is that the pager content
-     * (number of tabs and tab titles) does not change after this call has been made.
-     */
-    public void setViewPager(ViewPager viewPager) {
-        mTabStrip.removeAllViews();
-
-        mViewPager = viewPager;
-        if (viewPager != null) {
-            viewPager.setOnPageChangeListener(new InternalViewPagerListener());
-            populateTabStrip();
-        }
-    }
-
-    /**
-     * Create a default view to be used for tabs. This is called if a custom tab view is not set via
-     * {@link #setCustomTabView(int, int)}.
-     */
-    protected TextView createDefaultTabView(Context context) {
-        TextView textView = new TextView(context);
-        textView.setGravity(Gravity.CENTER);
-        textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP);
-        textView.setTypeface(Typeface.DEFAULT_BOLD);
-
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
-            // If we're running on Honeycomb or newer, then we can use the Theme's
-            // selectableItemBackground to ensure that the View has a pressed state
-            TypedValue outValue = new TypedValue();
-            getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
-                    outValue, true);
-            textView.setBackgroundResource(outValue.resourceId);
-        }
-
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
-            // If we're running on ICS or newer, enable all-caps to match the Action Bar tab style
-            textView.setAllCaps(true);
-        }
-
-        int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density);
-        textView.setPadding(padding, padding, padding, padding);
-
-        return textView;
-    }
-
-    private void populateTabStrip() {
-        final PagerAdapter adapter = mViewPager.getAdapter();
-        final View.OnClickListener tabClickListener = new TabClickListener();
-
-        for (int i = 0; i < adapter.getCount(); i++) {
-            View tabView = null;
-            TextView tabTitleView = null;
-
-            if (mTabViewLayoutId != 0) {
-                // If there is a custom tab view layout id set, try and inflate it
-                tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip,
-                        false);
-                tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId);
-            }
-
-            if (tabView == null) {
-                tabView = createDefaultTabView(getContext());
-            }
-
-            if (tabTitleView == null && TextView.class.isInstance(tabView)) {
-                tabTitleView = (TextView) tabView;
-            }
-
-            tabTitleView.setText(adapter.getPageTitle(i));
-            tabView.setOnClickListener(tabClickListener);
-
-            mTabStrip.addView(tabView);
-        }
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        super.onAttachedToWindow();
-
-        if (mViewPager != null) {
-            scrollToTab(mViewPager.getCurrentItem(), 0);
-        }
-    }
-
-    private void scrollToTab(int tabIndex, int positionOffset) {
-        final int tabStripChildCount = mTabStrip.getChildCount();
-        if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) {
-            return;
-        }
-
-        View selectedChild = mTabStrip.getChildAt(tabIndex);
-        if (selectedChild != null) {
-            int targetScrollX = selectedChild.getLeft() + positionOffset;
-
-            if (tabIndex > 0 || positionOffset > 0) {
-                // If we're not at the first child and are mid-scroll, make sure we obey the offset
-                targetScrollX -= mTitleOffset;
-            }
-
-            scrollTo(targetScrollX, 0);
-        }
-    }
-
-    private class InternalViewPagerListener implements ViewPager.OnPageChangeListener {
-        private int mScrollState;
-
-        @Override
-        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
-            int tabStripChildCount = mTabStrip.getChildCount();
-            if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) {
-                return;
-            }
-
-            mTabStrip.onViewPagerPageChanged(position, positionOffset);
-
-            View selectedTitle = mTabStrip.getChildAt(position);
-            int extraOffset = (selectedTitle != null)
-                    ? (int) (positionOffset * selectedTitle.getWidth())
-                    : 0;
-            scrollToTab(position, extraOffset);
-
-            if (mViewPagerPageChangeListener != null) {
-                mViewPagerPageChangeListener.onPageScrolled(position, positionOffset,
-                        positionOffsetPixels);
-            }
-        }
-
-        @Override
-        public void onPageScrollStateChanged(int state) {
-            mScrollState = state;
-
-            if (mViewPagerPageChangeListener != null) {
-                mViewPagerPageChangeListener.onPageScrollStateChanged(state);
-            }
-        }
-
-        @Override
-        public void onPageSelected(int position) {
-            if (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
-                mTabStrip.onViewPagerPageChanged(position, 0f);
-                scrollToTab(position, 0);
-            }
-
-            if (mViewPagerPageChangeListener != null) {
-                mViewPagerPageChangeListener.onPageSelected(position);
-            }
-        }
-
-    }
-
-    private class TabClickListener implements View.OnClickListener {
-        @Override
-        public void onClick(View v) {
-            for (int i = 0; i < mTabStrip.getChildCount(); i++) {
-                if (v == mTabStrip.getChildAt(i)) {
-                    mViewPager.setCurrentItem(i);
-                    return;
-                }
-            }
-        }
-    }
-
-}
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/SlidingTabStrip.java b/main/src/ui/java/de/blinkt/openvpn/views/SlidingTabStrip.java
deleted file mode 100644
index 88bfb9a3..00000000
--- a/main/src/ui/java/de/blinkt/openvpn/views/SlidingTabStrip.java
+++ /dev/null
@@ -1,207 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package de.blinkt.openvpn.views;
-
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.util.AttributeSet;
-import android.util.TypedValue;
-import android.view.View;
-import android.widget.LinearLayout;
-
-class SlidingTabStrip extends LinearLayout {
-
-    private static final int DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS = 2;
-    private static final byte DEFAULT_BOTTOM_BORDER_COLOR_ALPHA = 0x26;
-    private static final int SELECTED_INDICATOR_THICKNESS_DIPS = 8;
-    private static final int DEFAULT_SELECTED_INDICATOR_COLOR = 0xFF33B5E5;
-
-    private static final int DEFAULT_DIVIDER_THICKNESS_DIPS = 1;
-    private static final byte DEFAULT_DIVIDER_COLOR_ALPHA = 0x20;
-    private static final float DEFAULT_DIVIDER_HEIGHT = 0.5f;
-
-    private final int mBottomBorderThickness;
-    private final Paint mBottomBorderPaint;
-
-    private final int mSelectedIndicatorThickness;
-    private final Paint mSelectedIndicatorPaint;
-
-    private final int mDefaultBottomBorderColor;
-
-    private final Paint mDividerPaint;
-    private final float mDividerHeight;
-
-    private int mSelectedPosition;
-    private float mSelectionOffset;
-
-    private SlidingTabLayout.TabColorizer mCustomTabColorizer;
-    private final SimpleTabColorizer mDefaultTabColorizer;
-
-    SlidingTabStrip(Context context) {
-        this(context, null);
-    }
-
-    SlidingTabStrip(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        setWillNotDraw(false);
-
-        final float density = getResources().getDisplayMetrics().density;
-
-        TypedValue outValue = new TypedValue();
-        context.getTheme().resolveAttribute(android.R.attr.colorForeground, outValue, true);
-        final int themeForegroundColor =  outValue.data;
-
-        mDefaultBottomBorderColor = setColorAlpha(themeForegroundColor,
-                DEFAULT_BOTTOM_BORDER_COLOR_ALPHA);
-
-        mDefaultTabColorizer = new SimpleTabColorizer();
-        mDefaultTabColorizer.setIndicatorColors(DEFAULT_SELECTED_INDICATOR_COLOR);
-        mDefaultTabColorizer.setDividerColors(setColorAlpha(themeForegroundColor,
-                DEFAULT_DIVIDER_COLOR_ALPHA));
-
-        mBottomBorderThickness = (int) (DEFAULT_BOTTOM_BORDER_THICKNESS_DIPS * density);
-        mBottomBorderPaint = new Paint();
-        mBottomBorderPaint.setColor(mDefaultBottomBorderColor);
-
-        mSelectedIndicatorThickness = (int) (SELECTED_INDICATOR_THICKNESS_DIPS * density);
-        mSelectedIndicatorPaint = new Paint();
-
-        mDividerHeight = DEFAULT_DIVIDER_HEIGHT;
-        mDividerPaint = new Paint();
-        mDividerPaint.setStrokeWidth((int) (DEFAULT_DIVIDER_THICKNESS_DIPS * density));
-    }
-
-    void setCustomTabColorizer(SlidingTabLayout.TabColorizer customTabColorizer) {
-        mCustomTabColorizer = customTabColorizer;
-        invalidate();
-    }
-
-    void setSelectedIndicatorColors(int... colors) {
-        // Make sure that the custom colorizer is removed
-        mCustomTabColorizer = null;
-        mDefaultTabColorizer.setIndicatorColors(colors);
-        invalidate();
-    }
-
-    void setDividerColors(int... colors) {
-        // Make sure that the custom colorizer is removed
-        mCustomTabColorizer = null;
-        mDefaultTabColorizer.setDividerColors(colors);
-        invalidate();
-    }
-
-    void onViewPagerPageChanged(int position, float positionOffset) {
-        mSelectedPosition = position;
-        mSelectionOffset = positionOffset;
-        invalidate();
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        final int height = getHeight();
-        final int childCount = getChildCount();
-        final int dividerHeightPx = (int) (Math.min(Math.max(0f, mDividerHeight), 1f) * height);
-        final SlidingTabLayout.TabColorizer tabColorizer = mCustomTabColorizer != null
-                ? mCustomTabColorizer
-                : mDefaultTabColorizer;
-
-        // Thick colored underline below the current selection
-        if (childCount > 0) {
-            View selectedTitle = getChildAt(mSelectedPosition);
-            int left = selectedTitle.getLeft();
-            int right = selectedTitle.getRight();
-            int color = tabColorizer.getIndicatorColor(mSelectedPosition);
-
-            if (mSelectionOffset > 0f && mSelectedPosition < (getChildCount() - 1)) {
-                int nextColor = tabColorizer.getIndicatorColor(mSelectedPosition + 1);
-                if (color != nextColor) {
-                    color = blendColors(nextColor, color, mSelectionOffset);
-                }
-
-                // Draw the selection partway between the tabs
-                View nextTitle = getChildAt(mSelectedPosition + 1);
-                left = (int) (mSelectionOffset * nextTitle.getLeft() +
-                        (1.0f - mSelectionOffset) * left);
-                right = (int) (mSelectionOffset * nextTitle.getRight() +
-                        (1.0f - mSelectionOffset) * right);
-            }
-
-            mSelectedIndicatorPaint.setColor(color);
-
-            canvas.drawRect(left, height - mSelectedIndicatorThickness, right,
-                    height, mSelectedIndicatorPaint);
-        }
-
-        // Thin underline along the entire bottom edge
-        canvas.drawRect(0, height - mBottomBorderThickness, getWidth(), height, mBottomBorderPaint);
-
-        // Vertical separators between the titles
-        int separatorTop = (height - dividerHeightPx) / 2;
-        for (int i = 0; i < childCount - 1; i++) {
-            View child = getChildAt(i);
-            mDividerPaint.setColor(tabColorizer.getDividerColor(i));
-            canvas.drawLine(child.getRight(), separatorTop, child.getRight(),
-                    separatorTop + dividerHeightPx, mDividerPaint);
-        }
-    }
-
-    /**
-     * Set the alpha value of the {@code color} to be the given {@code alpha} value.
-     */
-    private static int setColorAlpha(int color, byte alpha) {
-        return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
-    }
-
-    /**
-     * Blend {@code color1} and {@code color2} using the given ratio.
-     *
-     * @param ratio of which to blend. 1.0 will return {@code color1}, 0.5 will give an even blend,
-     *              0.0 will return {@code color2}.
-     */
-    private static int blendColors(int color1, int color2, float ratio) {
-        final float inverseRation = 1f - ratio;
-        float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
-        float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
-        float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
-        return Color.rgb((int) r, (int) g, (int) b);
-    }
-
-    private static class SimpleTabColorizer implements SlidingTabLayout.TabColorizer {
-        private int[] mIndicatorColors;
-        private int[] mDividerColors;
-
-        @Override
-        public final int getIndicatorColor(int position) {
-            return mIndicatorColors[position % mIndicatorColors.length];
-        }
-
-        @Override
-        public final int getDividerColor(int position) {
-            return mDividerColors[position % mDividerColors.length];
-        }
-
-        void setIndicatorColors(int... colors) {
-            mIndicatorColors = colors;
-        }
-
-        void setDividerColors(int... colors) {
-            mDividerColors = colors;
-        }
-    }
-}
\ No newline at end of file
diff --git a/main/src/ui/java/de/blinkt/openvpn/views/TabBarView.java b/main/src/ui/java/de/blinkt/openvpn/views/TabBarView.java
deleted file mode 100644
index 71f03c03..00000000
--- a/main/src/ui/java/de/blinkt/openvpn/views/TabBarView.java
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2012-2016 Arne Schwabe
- * Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
- */
-
-package de.blinkt.openvpn.views;
-
-import android.support.v4n.view.ViewPager;
-
-/**
- * Created by arne on 18.11.14.
- */
-public interface TabBarView {
-
-    void setViewPager(ViewPager mPager);
-}
diff --git a/main/src/ui/res/layout-v21/tabs.xml b/main/src/ui/res/layout-v21/tabs.xml
index af349a4f..a4283190 100644
--- a/main/src/ui/res/layout-v21/tabs.xml
+++ b/main/src/ui/res/layout-v21/tabs.xml
@@ -4,11 +4,12 @@
   -->
 <merge xmlns:blinkt="http://schemas.android.com/apk/res-auto">
 
-    <de.blinkt.openvpn.views.PagerSlidingTabStrip xmlns:android="http://schemas.android.com/apk/res/android"
+    <androidx.viewpager.widget.PagerTabStrip xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/sliding_tabs"
         android:layout_width="match_parent"
         android:layout_height="?android:attr/actionBarSize"
         android:background="@drawable/bg_tabs"
+        android:layout_gravity="top"
         blinkt:pstsIndicatorColor="@color/accent"
         blinkt:pstsIndicatorHeight="3dp"
         android:elevation="8dp" />
diff --git a/main/src/ui/res/layout/main_activity.xml b/main/src/ui/res/layout/main_activity.xml
index 7b6caf00..d47bacc5 100644
--- a/main/src/ui/res/layout/main_activity.xml
+++ b/main/src/ui/res/layout/main_activity.xml
@@ -4,15 +4,26 @@
   -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
 
-    <include layout="@layout/tabs" />
 
-    <android.support.v4n.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
+    <androidx.viewpager.widget.ViewPager
         android:id="@+id/pager"
         android:layout_width="match_parent"
-        android:layout_height="match_parent" />
+        android:layout_height="match_parent">
+
+        <com.google.android.material.tabs.TabLayout
+            style="@style/AppTabLayout"
+            android:id="@+id/tab_layout"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="top"
+
+            />
+
+    </androidx.viewpager.widget.ViewPager>
 
 </LinearLayout>
diff --git a/main/src/ui/res/layout/padersliding_tab.xml b/main/src/ui/res/layout/padersliding_tab.xml
deleted file mode 100644
index 07c8daa9..00000000
--- a/main/src/ui/res/layout/padersliding_tab.xml
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-
-<!--
-  ~ Copyright (c) 2012-2016 Arne Schwabe
-  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
-  -->
-
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/tab_title"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:gravity="center"
-    android:singleLine="true" />
\ No newline at end of file
diff --git a/main/src/ui/res/layout/sliding_tab.xml b/main/src/ui/res/layout/sliding_tab.xml
new file mode 100644
index 00000000..07c8daa9
--- /dev/null
+++ b/main/src/ui/res/layout/sliding_tab.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) 2012-2016 Arne Schwabe
+  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
+  -->
+
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/tab_title"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center"
+    android:singleLine="true" />
\ No newline at end of file
diff --git a/main/src/ui/res/layout/tabs.xml b/main/src/ui/res/layout/tabs.xml
deleted file mode 100644
index a68c4e42..00000000
--- a/main/src/ui/res/layout/tabs.xml
+++ /dev/null
@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!--
-  ~ Copyright (c) 2012-2016 Arne Schwabe
-  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
-  -->
-<merge>
-
-    <de.blinkt.openvpn.views.SlidingTabLayout xmlns:android="http://schemas.android.com/apk/res/android"
-        android:id="@+id/sliding_tabs"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content" />
-
-</merge>
\ No newline at end of file
diff --git a/main/src/ui/res/layout/tlsremote.xml b/main/src/ui/res/layout/tlsremote.xml
index 5ebeb051..1e393d6b 100644
--- a/main/src/ui/res/layout/tlsremote.xml
+++ b/main/src/ui/res/layout/tlsremote.xml
@@ -1,18 +1,18 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
+<?xml version="1.0" encoding="utf-8"?><!--
   ~ Copyright (c) 2012-2016 Arne Schwabe
   ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
   -->
 
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
+    android:layout_height="match_parent"
     android:padding="@dimen/stdpadding"
-    android:layout_height="match_parent" >
+    android:theme="@style/Theme.AppCompat.Dialog.Alert">
 
     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:orientation="vertical" >
+        android:orientation="vertical">
 
         <TextView
             android:id="@+id/dialogHeader"
@@ -40,7 +40,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="20dp"
             android:ems="10"
-            android:inputType="text" >
+            android:inputType="text">
 
             <requestFocus />
         </EditText>
diff --git a/main/src/ui/res/values-v21/colours.xml b/main/src/ui/res/values-v21/colours.xml
deleted file mode 100644
index 024e47eb..00000000
--- a/main/src/ui/res/values-v21/colours.xml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  ~ Copyright (c) 2012-2016 Arne Schwabe
-  ~ Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
-  -->
-
-<resources>
-    <color name="switchbar">#5C6BC0</color>    <!-- 400-->
-</resources>
\ No newline at end of file
-- 
cgit v1.2.3