android讲义2之在xml中设定imageButtion

//把此文件放在drawable下，然后可以通过android:background="@drawable/button_selector"或者android:src="@drawable/button_selector"下进行。

<?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/button_pressed"/><!-- pressed -->
     <item android:state_focused="true"
           android:drawable="@drawable/button_focused"/><!-- focused -->
     <item android:drawable="@drawable/button_normal"/><!-- default -->
 </selector>