session-android/res/drawable/quick_camera_shutter_ring.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape
            android:innerRadiusRatio="3"
            android:shape="ring"
            android:thickness="2dp"
            android:useLevel="false" >
            <solid android:color="@android:color/white" />
            <size
                android:height="52dp"
                android:width="52dp" />
        </shape>
    </item>
    <item>
        <shape
            android:innerRadiusRatio="3"
            android:shape="ring"
            android:thickness="2dp"
            android:useLevel="false" >
            <solid android:color="#40ffffff" />
            <size
                android:height="52dp"
                android:width="52dp" />
        </shape>
    </item>
</selector>