space-android/src/main/res/drawable/favorite_button_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/ic_favorite" android:state_selected="true"></item>
    <item android:drawable="@drawable/ic_favorite" android:state_pressed="true"></item>
    <item android:drawable="@drawable/ic_favorite_grey"></item>
</selector>