Android地图覆盖绘制

我已经创建了一个map overlay类,并重写了如下所示的Ontouchevent方法:

 @Override
    public boolean onTouchEvent(MotionEvent event, MapView mapView) 
    {   
        //TO-DO here we will capture when the users
        //has pointed a point to go..
        if(event.getAction() != MotionEvent.ACTION_MOVE){
            GeoPoint p = mapView.getProjection().fromPixels(
                    (int) event.getX(),
                    (int) event.getY());

                Geocoder geoCoder = new Geocoder(
                    getBaseContext(), Locale.getDefault());
                try {
                    List<Address> addresses = geoCoder.getFromLocation(
                        p.getLatitudeE6()  / 1E6, 
                        p.getLongitudeE6() / 1E6, 1);

                    String add = "";
                    if (addresses.size() > 0) 
                    {
                        for (int i=0; i<addresses.get(0).getMaxAddressLineIndex(); 
                             i++)
                           add += addresses.get(0).getAddressLine(i) + "\n";
                    }
                    Log.e("##################",
                            "screen touched: lat:"+(p.getLatitudeE6()/ 1E6)+"long:"+(p.getLongitudeE6()/ 1E6));
                    showMap((p.getLatitudeE6()/ 1E6),(p.getLongitudeE6()/ 1E6));
                    Toast.makeText(getBaseContext(), add, Toast.LENGTH_SHORT).show();
                }
                catch (IOException e) {                
                    e.printStackTrace();
                }   
                return true;
        }else
            return false;
    }        

问题是每次我在地图上做手势时都会画地图,我只想在我点击地图上的一个点而不是拖动地图时才画,这种方法正确吗?如何实现这一点?