How to compute a radius around a point in an Android MapView?

Question

I have a MapView that I\'m displaying a \"useful radius\" (think accuracy of coordinate) in. Using MapView\'s Projection\'s metersToEquatorPixels, which is admi

Answer 1

projection.toPixels(GeoP, pt);
float radius = projection.metersToEquatorPixels(50);

Try this and see... i used it on my MapRadius and it seems to be working

Answer 2

So, Google Maps uses a Mercator projection. This means that the further you get from the equator the more distorted the distances become. According to this discussion, the proper way to convert for distances is something like:

public static int metersToRadius(float meters, MapView map, double latitude) {
    return (int) (map.getProjection().metersToEquatorPixels(meters) * (1/ Math.cos(Math.toRadians(latitude))));         
}

Answer 3

mMap.addCircle(
    new CircleOptions().center(
        new LatLng(
            bounds.getCenter().latitude, 
            bounds.getCenter().longitude
        )
    )
    .radius(50000)
    .strokeWidth(0f)
    .fillColor(0x550000FF)
);