[Android]由XML設定按鈕觸碰時換圖片效果

set ImageButton's background to the following XML drawable file:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:state_pressed="false"
android:drawable="@drawable/btn_normal" />

<item android:state_pressed="true"
android:drawable="@drawable/btn_pressed" />

</selector>

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