<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android"
    tools:ignore="MissingDefaultResource">

    <!--    只有上下边框的shape    -->
    <item>
        <shape>
            <!--    边框颜色    -->
            <solid android:color="@color/press_color"/>
        </shape>
    </item>
    <!--    想保留哪一边就设置哪一边边框就好了，列如只有上边框：top="1dp"    -->
    <item android:bottom="0dp"
        android:left="1px"
        android:right="1px"
        android:top="0dp"
        >
        <shape>
            <solid android:color="@color/transparent"/>
        </shape>
    </item>
</layer-list>
