xn-handheld-android/app/src/main/res/drawable/button_ren_wu_rign.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Selected state -->
    <item android:state_checked="true">
        <shape android:shape="rectangle">
            <solid android:color="#ff0183fa" />
            <corners
                android:bottomLeftRadius="0dp"
                android:bottomRightRadius="40dp"
                android:topLeftRadius="0dp"
                android:topRightRadius="40dp" />
        </shape>
    </item>
    <!-- Default state -->
    <item android:state_checked="false">
        <shape android:shape="rectangle">
            <solid android:color="#ffffffff" />
            <corners android:bottomLeftRadius="0dp" android:bottomRightRadius="40dp" android:topLeftRadius="0dp" android:topRightRadius="40dp" />
        </shape>
    </item>
</selector>