android shape stroke只绘制一边或者某几边

 <?xml version="1.0" encoding="utf-8"?>

 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">

     <item

         android:right="-2dp"

         android:top="-2dp">

         <shape>

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

             <stroke

                 android:width="1px"

                 android:color="@color/split_line" />

         </shape>

     </item>

 </layer-list>

-2dp表示不绘制这一边