tests/leanbackjank/app/res/drawable/player_bg_gradient_dark.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <gradient
        android:angle="90"
        android:centerColor="#00000000"
        android:endColor="#B2000000"
        android:startColor="#B2000000"
        android:type="linear" />

</shape>