在 mapView 中平移无法正常工作

Question

我有 mapView 并以编程方式处理触摸事件。

问题是：如果mapview是ZoomOut到最大，平移会很小很慢，符合mapView是ZoomIn，平移会更大更快。换句话说：zoomIN 越大，平移运动越大。

如何使平移移动不相应缩放，所以每次移动地图时，无论缩放级别如何，它都会移动相同的距离？

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();

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

....

//move mapView
private boolean doPanning(MotionEvent e, MapView mapView)
{
if(savedTouchedX >= 0 && savedTouchedY >= 0)
{
    IGeoPoint mapCenter = mapView.getMapCenter();
    GeoPoint panToCenter = new GeoPoint((int)(mapCenter.getLatitudeE6() + (e.getY() - savedTouchedY) * 1E5),
    (int)(mapCenter.getLongitudeE6() - (e.getX() - savedTouchedX) * 1E5));
    mapView.getController().setCenter(panToCenter);
}
savedTouchedX = e.getX();
savedTouchedY = e.getY();
return true;
}

Answer 1

基于 TouchEvent，以编程方式移动地图

yourFrameLayout.setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View v , MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
});

SimpleOnGestureListener listener = new SimpleOnGestureListener() {
    @Override
    public boolean onFling(MotionEvent e1 , MotionEvent e2 , float velocityX , float velocityY) {

        float Xdirection = e1.getX() - e2.getX();
        float Ydirection = e1.getY() - e2.getY();

        //TODO- Do some calculations & change the maps lat & lon. 
        // Also consider zoom level while calculating.

        final double newLat = (getOldLat - (moveSomeLatBasedOnXDirection)));
        final double newLon = (getOldLon - (moveSomeLatBasedOnYDirection)));

        CameraUpdate center = CameraUpdateFactory.newLatLng(new LatLng( newLat, newLon));

        map.moveCamera(center);


        return super.onFling(e1, e2, velocityX, velocityY);
    };

};
GestureDetector gestureDetector = new GestureDetector(getActivity(), listener);

Answer 2

这会隐藏您的视图。并禁用触摸它。其实这就是你所需要的。

 memecontentView.setVisibility(View.GONE);

这个节目视图。

memecontentView.setVisibility(View.VISIBLE);
memecontentView.bringToFront();

移动到另一个布局

public void moveView(View view,ViewGroup destination) {
    ((ViewGroup)view.getParent()).removeView(view);
     //Also you can set LayoutParams here
     destination.addView(src);
     destination.getChildAt(destination.indexOf(src)).bringToFront();
}

用法：

moveView(mapView,yourFrameLayout);

Answer 3

“我需要用另一张图片覆盖地图”

=> 不完全确定了解其他图像的行为方式。

如果您将其设置为OSMBonusPack GroundOverlay，它将被绘制在地图上方。地图将对所有事件（平移、缩放）做出反应，并且上面的图像也将根据地图移动而移动。

如果上面的图像不应该随着地图移动而移动，那么您可以实现一个新的（但非常简单的）叠加层，将您的图像绘制在地图视图上的固定位置。它的draw方法应该是：

@Override protected void draw(Canvas c, MapView mapView, boolean shadow) {
  if (shadow)
    return;
  canvas.drawBitmap(myImage, screenX, screenY, null);
}