//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>
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