<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid android:color="@color/black" />
</shape>
</item>//增加、编辑各边的线条
<item
android:left="2dp"
>
<shape>
<solid android:color="@color/white" />
</shape>
</item>
</layer-list>
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