dxcgt_app / app / src / main / res / anim / activity_fade_out.xml

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:fromAlpha="1"
    android:startOffset="0"
    android:toAlpha="0" >

</alpha>