session-android/res/drawable/emoji_category_smile.xml

<?xml version="1.0" encoding="utf-8"?>
<selector
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:enterFadeDuration="200"
	android:exitFadeDuration="300"
	>
	<item
		android:state_selected="true"
		android:drawable="@drawable/ic_smiles_smile_active"
		>
	</item>
	<item
		android:drawable="@drawable/ic_smiles_smile"
		>
	</item>
</selector>