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

    <solid android:color="#ffffff" />
 <!-- 定义填充的颜色值 -->
    <stroke
        android:width="0.5dp"
        android:color="#aaaaaa" />

    <corners android:radius="3dp" />

</shape>