android maps: how to determine map center after a drag has been completed

Question

Hi. Is there a way through the android maps API, where I can detect the map center after pan animation has completed? I want to use this information to load markers from a server dynamically. Thanks BD

Answer 1

Are you using a MapActivity? Here's the code I've used:

MapView mapView = (MapView)findViewById(R.id.map);
Projection projection = mapView.getProjection();
int y = mapView.getHeight() / 2; 
int x = mapView.getWidth() / 2;

GeoPoint geoPoint = projection.fromPixels(x, y);
double centerLatitude = (double)geoPoint.getLatitudeE6() / (double)1E6;
double centerLongitude = (double)geoPoint.getLongitudeE6() / (double)1E6;

You do need to add code similar to this also:

@Override
public boolean dispatchTouchEvent(MotionEvent event)
{
    boolean result = super.dispatchTouchEvent(event);
    if (event.getAction() == MotionEvent.ACTION_UP)
        reload_map_data();    ///  call the first block of code here
    return result;
}

Answer 2

that solution above could have zoom control malfunction! It seems that the ev.getAction == MotionEvent.ACTION_UP could trigger the same function as zoom control, to make zoom out/in until reach the limit.

Could anyone help me out here? How could I distinguish between zoom control and the function above?? THX!~