<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/img_btn_pause_pressed"
        android:state_focused="true"
        android:state_pressed="true" />
    <item android:drawable="@drawable/img_btn_pause_pressed"
        android:state_focused="false"
        android:state_pressed="true" />
    <item android:drawable="@drawable/img_btn_pause_pressed" android:state_focused="true" />
    <item android:drawable="@drawable/img_btn_pause"
        android:state_focused="false"
        android:state_pressed="false" />
</selector>