<?xml version="1.0" encoding="utf-8"?><!--白色的圆角背景-->
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <solid android:color="@color/white" />

    <corners
        android:topLeftRadius="@dimen/dp_20"
        android:topRightRadius="@dimen/dp_20" />
</shape>