uu-android/app_modular/appmusic/src/main/res/drawable/selector_btn.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/music_paying"
        ></item>
    <item android:state_selected="true"
        android:drawable="@drawable/music_paying"
        ></item>
    <item android:drawable="@drawable/music_start"></item>
</selector>