android 在drawable描边只描一边

使用layout-list

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:left="-2dp"
android:right="-2dp"
android:top="-2dp">
<shape>
<stroke android:width="1dp"
android:color="@color/black"/>
</shape>
</item>
</layer-list>