LoopbackApp/app/src/main/res/drawable-xxxhdpi/togglebutton_state_drawable.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/ontogglebutton"
        android:state_checked="true" />
    <item
        android:drawable="@drawable/offtogglebutton"
        android:state_checked="false" />
</selector>