android - 覆盖 osmdroid MapView 的默认平移/移动

Question

我有 mapView 并且我以编程方式处理触摸事件。

问题是:如果mapview是ZoomOut到最大，则平移很小而且很慢，而符合mapView是ZoomIn，则平移更大更快。换句话说:zoomIN 越大，平移 Action 越大。

我怎样才能使平移移动不相应地缩放，所以每次我移动 map 时，无论缩放级别如何，它都会移动相同的距离？还是有另一种方法可以覆盖 mapview 中的平移？

这是我的安卓客户端

private double savedTouchedX = -1;
private double savedTouchedY = -1;
....

mapView.setOnTouchListener(new MapView.OnTouchListener() {

        @Override
        public boolean onTouch(View arg0, MotionEvent event) {
            int action = event.getAction();
            final Projection pj = mapView.getProjection();
            GeoPoint eventPosition = (GeoPoint) pj.fromPixels((int)event.getX(), (int)event.getY());

             switch(action)
             {
                case MotionEvent.ACTION_DOWN:
                    savedTouchedX = eventPosition.getLongitude();
                    savedTouchedY = eventPosition.getLatitude();
                    break;
                case MotionEvent.ACTION_MOVE:
                    doPanning(eventPosition, mapView);
                    break;
                case MotionEvent.ACTION_UP:
                    doPanning(eventPosition, mapView);
                    savedTouchedX = -1;
                    savedTouchedY = -1;
                    break;
                default:
                    break;
             }
             return true;
        }
    });

//move mapView
private boolean doPanning(GeoPoint e, MapView mapView)
 {
        GeoPoint mapCenter = (GeoPoint) mapView.getMapCenter();
        GeoPoint panToCenter = new GeoPoint((int)(mapCenter.getLatitudeE6() + (e.getLatitude() - savedTouchedY) * 1E5),
        (int)(mapCenter.getLongitudeE6() - (e.getLongitude() - savedTouchedX) * 1E5));
        mapView.getController().setCenter(panToCenter);
    savedTouchedX = e.getLongitude();
    savedTouchedY = e.getLatitude();
    return true;
 }

Answer 1

您必须将您的 MotionEvent 位置(在屏幕坐标中)转换为 map 位置。这根本就不是同一个坐标系!

final Projection pj = mapView.getProjection();
GeoPoint eventPosition = (GeoPoint) pj.fromPixels((int)event.getX(), (int)event.getY());