How to add touch event to show latitude and longitude in a toast in OSM

问题

How do I add this function below in my code? The url is this: how to add more marker in osm map in android please help me? I want to add feature to print toast message of every location where user touches on the screen and displays its latitude and longitude on map in toast message

public boolean onTouchEvent(MotionEvent event, MapView mapView) {   

    if (event.getAction() == 1) {                
        GeoPoint geopoint = (GeoPoint) mapView.getProjection().fromPixels((int) event.getX(), (int) event.getY());
        // latitude
        double lat = geopoint.getLatitudeE6() / 1E6;
        // longitude
        double lon = geopoint.getLongitudeE6() / 1E6;
        Toast.makeText(context, "Lat: " + lat + ", Lon: "+lon, Toast.LENGTH_SHORT).show();
    }                            
    return false;
} 

回答1:

Use this piece of code and create an object of this class and add it to the mapsOverlay

class MapOverlay extends com.google.android.maps.Overlay
{
    @Override
    public boolean draw(Canvas canvas, MapView mapView, 
    boolean shadow, long when) 
    {
       //...
    }

    @Override
    public boolean onTouchEvent(MotionEvent event, MapView mapView) 
    {   
        //---when user lifts his finger---
        if (event.getAction() == MotionEvent.ACTION_UP) {                
            GeoPoint p = mapView.getProjection().fromPixels(
                (int) event.getX(),
                (int) event.getY());
                Toast.makeText(getBaseContext(), 
                    p.getLatitudeE6() / 1E6 + "," + 
                    p.getLongitudeE6() /1E6 , 
                    Toast.LENGTH_SHORT).show();
        }                            
        return false;
    }        
}

add this line

mapView.getOverlays().add(new MapOverlay());

来源：https://stackoverflow.com/questions/13721604/how-to-add-touch-event-to-show-latitude-and-longitude-in-a-toast-in-osm