<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 单击时的背景颜色 -->

    <item
        android:drawable="@color/gray3"
        android:state_pressed="true">
    </item>
    <!-- 未单击时的背景颜色 -->
    <item
        android:drawable="@color/white"
        android:state_pressed="false">
    </item>
</selector>