<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!--选中时的图片背景-->
    <item android:state_selected="true" android:drawable="@drawable/message_select_true" />
    <!-- 默认时的背景图片-->
    <item android:drawable="@drawable/message_select_false" />
</selector>