setRadius on Circle gives bad user experience in Google Maps

Question

I'm trying to implement something like in Google Maps samples and their CircleDemoActivity:

Android Samples

The problem is that, the circle is disappearing and appearing, and I recorded that problem

Google Maps Sample problem

In my opinion that part should work:

if (marker.equals(radiusMarker)) {
    radius = toRadiusMeters(centerMarker.getPosition(), radiusMarker.getPosition());
    circle.setRadius(radius);
    return true;
}

and the problem is with setRadius method, but maybe is some workaround.

Question

How to fix that?

Answer 1

Few months ago I had to implement an animation of a circle growing and shrinking to under a marker to inform our user that the marker location was not precisely known.

In a first implementation I used a circle and had the same issue. I ended up using a GroundOverlay with a circle image and it does not blink. It may just require more maths to get the correct radius.

I hope it could help :)