底部边框
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<--边框颜色-->
<solid android:color="#EDF1F5"/>
</shape>
</item>
<item android:bottom="2px">
<shape>
<--内容颜色-->
<solid android:color="@color/white"/>
</shape>
</item>
</layer-list>