OsmAnd/OsmAnd/res/drawable/btn_inset_circle_transparent.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/btn_inset_circle_p" android:state_pressed="true"/>
    <item>
        <bitmap
            android:gravity="fill"
            android:src="@drawable/map_bt_round_2_shadow" />
    </item>
</selector>