Android 边框，只有底部边框

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>