res/drawable/shot_circle.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="oval">
            <size android:width="70dp" android:height="70dp"/>
            <stroke android:width="0.5dp" android:color="#CCFFFFFF" />
            <solid android:color="#66FFFFFF" />
        </shape>
    </item>

</selector>