app/src/custom/res/animator/alpha4.xml


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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <objectAnimator
        android:propertyName="alpha"
        android:duration="1000"
        android:startOffset="4000"
        android:valueFrom="1"
        android:valueTo="0" />
</set>