How to get the blue range circle in Google Maps?

Right now my Android app uses an overlay to place a pin down from drawable. I want a ra开发者_如何学Pythonnge in there too just like Google maps has when it is locking on to your position. How do I get that? Do I have to do an overlay, or is it part of maps?

BTW I am not drawing my loction, but a specific geopoint

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Yeah in the overlay class, in function

draw(Canvas canvas, MapView mapView, boolean shadow, long when)

You can use the canvas.drawCirlce() Of course is a bit more complicated than that, you will have to play around with the api's

Use

Projection projection = mapView.getProjection();        
Point point = new Point();
projection.toPixels(geoPoint, point);

to map your geoPoint to the projection on the MapView.