CmaBusService_app/app/src/main/res/drawable/ic_back_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
        android:drawable="@drawable/ic_back_activity_press" /> <!-- pressed -->
    <item android:drawable="@drawable/ic_back_activity_normal" /> <!-- default -->
</selector>