It’s a little hack, but unless you find something better, this way it should be possible.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape >
<solid android:color="@color/border" />
</shape>
</item>
<!-- main color -->
<item android:bottom="1.5dp"
android:left="1.5dp"
android:right="1.5dp">
<shape >
<solid android:color="@color/background" />
</shape>
</item>
<!-- draw another block to cut-off the left and right bars -->
<item android:bottom="15.0dp">
<shape >
<solid android:color="@color/background" />
</shape>
</item>
</layer-list>