<?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle" >
   
    <!-- 填充的颜色 -->
    
    <solid android:color="@color/colorAccent" />
    <!-- 设置矩形的四个角为弧形 -->
     <!-- android:radius 弧形的半径 -->
     <corners android:radius="3dp" />
    <!-- 设置矩形的边框 -->
    <stroke
        android:color="@color/colorAccent"
        android:width="1dp"
        />
 
 </shape>