使用layer-list可以,画了两层
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<layer-list>
<!-- This is the line -->
<item android:left="8dp" android:right="8dp"><shape>
<solid android:color="@color/black" />
</shape></item>
<item android:bottom="3dp"><shape>
<solid android:color="@color/white" />
</shape></item>
</layer-list>
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优点 : 可以控制宽度