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<?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/play_press" />
<item android:state_focused="true" android:drawable="@drawable/play_press" />
<item android:drawable="@drawable/play" />
</selector>
然后button的background设置为上面的xml就可以了