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