LottieSample/src/main/res/drawable/ic_play_pause.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_activated="true" android:drawable="@drawable/ic_pause"/>
    <item android:drawable="@drawable/ic_play"/>
</selector>