要在value里面新建一个color.xml，吧white、gray定义出来，然后在用drawable里面的代码引用color

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:color="#808080" android:state_checked="true"></item>

    <item android:color="#FFFFFF" android:state_pressed="true"></item>

    <item android:color="#FFFFFF"></item>

</selector>

重点是这三句：

<item android:color="#808080" android:state_checked="true"></item>

    <item android:color="#FFFFFF" android:state_pressed="true"></item>

    <item android:color="#FFFFFF"></item>

android:color 就好

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:drawable="@color/gray" android:state_checked="true"></item>

    <item android:drawable="@color/white" android:state_pressed="true"></item>

    <item android:drawable="@color/white"></item>

</selector>

新建一个xml，选择drawable下建，选择selector。创建好了打开来就是加上

<item android:drawable="@color/gray" android:state_checked="true"></item>

    <item android:drawable="@color/white" android:state_pressed="true"></item>

    <item android:drawable="@color/white"></item>

这三句话就好了