Make a toggle to allow community translation (closes #681)

Since it is hard for me to check languages other than the ones that
I speak myself, languages other than English/German default to off.
This might change if I have someone trusted to review other languages.

1 files changed, 72 insertions, 0 deletions

diff --git a/main/src/main/java/de/blinkt/openvpn/core/LocaleHelper.java b/main/src/main/java/de/blinkt/openvpn/core/LocaleHelper.java
new file mode 100644
index 00000000..2b0c1975
--- /dev/null
+++ b/main/src/main/java/de/blinkt/openvpn/core/LocaleHelper.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2012-2021 Arne Schwabe
+ * Distributed under the GNU GPL v2 with additional terms. For full terms see the file doc/LICENSE.txt
+ */
+
+package de.blinkt.openvpn.core;
+
+import android.content.Context;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
+
+import java.util.Locale;
+
+public class LocaleHelper {
+    static private Locale desiredLocale = null;
+
+    public static void setDesiredLocale(Context c)
+    {
+        Locale current = Locale.getDefault();
+        boolean defForce = true;
+        if (current.getLanguage().equals(new Locale("de").getLanguage()))
+            defForce = false;
+
+        boolean allow_translation = Preferences.getDefaultSharedPreferences(c).getBoolean("allow_translation", defForce);
+
+        if (!allow_translation)
+            desiredLocale =  new Locale("en", current.getCountry());
+    }
+
+    public static Context updateResources(Context context) {
+        if (desiredLocale == null)
+            return context;
+
+        Locale.setDefault(desiredLocale);
+
+        Resources res = context.getResources();
+        Configuration config = new Configuration(res.getConfiguration());
+        if (Build.VERSION.SDK_INT >= 17) {
+            config.setLocale(desiredLocale);
+            context = context.createConfigurationContext(config);
+        } else {
+            config.locale = desiredLocale;
+            res.updateConfiguration(config, res.getDisplayMetrics());
+        }
+        return context;
+    }
+
+    public static void onConfigurationChange(Context context)
+    {
+        Resources res = context.getResources();
+
+        Locale current;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
+            current = res.getConfiguration().getLocales().get(0);
+        else
+            current = res.getConfiguration().locale;
+
+
+        if (current == desiredLocale)
+            return;
+
+        Configuration config = new Configuration(res.getConfiguration());
+
+        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1)
+            config.setLocale(desiredLocale);
+        else
+            config.locale = desiredLocale;
+
+        res.updateConfiguration(config, res.getDisplayMetrics());
+    }
+}