ReaderForSelfoss-multiplatform/androidApp/src/main/res/drawable/background_splash.xml

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

    <item>
        <shape android:shape="rectangle" >
            <solid android:color="?attr/colorSurface" />
        </shape>
    </item>

    <item>
        <bitmap
            android:gravity="center"
            android:src="@mipmap/ic_launcher_foreground"/>
    </item>

</layer-list>