<?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/white"></solid>
    <!-- android:radius 弧形的半径 -->
    <corners
        android:topLeftRadius="@dimen/rmrb_dp12"
        android:topRightRadius="@dimen/rmrb_dp12"  />

</shape>