<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!--  普通样式  -->
    <item android:drawable="@drawable/btn_normal" android:state_pressed="false"/>
    <!--  点击后样式  -->
    <item android:drawable="@drawable/btn_press" android:state_pressed="true"/>
</selector>