Android虚线分割Shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="line">

     <!-- 显示虚线，破折线的宽度为dashWith，空隙的宽度为dashGap, darkgray -->

 <!-- 显示一条虚线，破折线的宽度为dashWith，破折线之间的空隙的宽度为dashGap，当dashGap=0dp时，为实线 -->  

    <stroke android:width="1dp" android:color="#A9A9A9"  
             android:dashWidth="2dp" android:dashGap="3dp" /> 
    <size android:height="1dp" />  
</shape>