1、res文件夾下面color文件夾，放的xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
<item android:color="@color/color_brand1" android:state_pressed="true"/>   
<item android:color="@color/color_brand1" android:state_activated="true"/>  
<item android:color="@color/color_brand1" android:state_selected="true"/>   
<item android:color="@color/transparent" />
</selector>

寫法是這樣的，都是指定color顏色。