switch_open.xml

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="true">
    <item android:drawable="@drawable/btn_switch_off" android:duration="80" />
    <item android:drawable="@drawable/btn_switch_press" android:duration="80" />
    <item android:drawable="@drawable/btn_switch_on" android:duration="80" />
</animation-list>