WordPress/src/main/res/drawable/theme_loading.xml

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

    <item
        android:drawable="@drawable/ic_theme_loading"
        android:gravity="center" />

    <item
        android:drawable="@drawable/theme_loading_background" />

</layer-list>