app/src/main/res/drawable/state_on.xml


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<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="oval">
            <solid android:color="#DBDBDB"/>
            <size android:width="20dp" android:height="20dp"/>
        </shape>
    </item>
</layer-list>