Avalonia/samples/ControlCatalog.Android/Resources/drawable/splash_screen.xml

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

  <item>
    <color android:color="@color/splash_background"/>
  </item>

  <item android:drawable="@drawable/icon"
        android:width="120dp"
        android:height="120dp"
        android:gravity="center" />

</layer-list>