由网友(穷追一个梦)分享简介：我添加了一个标记，以我的地图，但是当我放大它移动到左侧（最大放大它标志着正确的地方），当我缩小它移动到右侧（最大放大了它的标记像3000公里从正确的地方）。I've added a mark to my map but when I zoom in it moves to the left (at maximum z...

我添加了一个标记，以我的地图，但是当我放大它移动到左侧（最大放大它标志着正确的地方），当我缩小它移动到右侧（最大放大了它的标记像3000公里从正确的地方）。

I've added a mark to my map but when I zoom in it moves to the left (at maximum zoom in it marks the right place) and when I zoom out it moves to the right (at maximum zoom out it marks like 3000Km from the right place).

下面是绘制标记物的onCreate之前（图像62px宽x 70像素高）类：

Here's the class that draws the marker before the onCreate (the image is 62px w x 70px h):

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

            Point screenPts = new Point();
            map.getProjection().toPixels(point, screenPts);

            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.mapmarker);            
            canvas.drawBitmap(bmp, screenPts.x + 50, screenPts.y - 70, null);         
            return true;
        }
    } 

和这里的code我用它来调用类：

And here's the code I use to call the class:

        latitud = loc.getLatitude();
            longitud = loc.getLongitude();
            precision = loc.getAccuracy();

        controlMapa = map.getController();
        point = new GeoPoint((int) (latitud * 1E6), (int) (longitud * 1E6));

        controlMapa.animateTo(point);
        controlMapa.setZoom(17);

        MapOverlay mapOverlay = new MapOverlay();
        List<Overlay> listOfOverlays = map.getOverlays();
        listOfOverlays.clear();
        listOfOverlays.add(mapOverlay);

        map.invalidate();

这是什么问题？我怎样才能让它们移动到正确的点每次变焦的变化？

What's the problem? How can I make them move to the correct point each time zoom changes?

感谢你在前进！

推荐答案

解决了！我不得不补充：

Solved! I just had to add:

canvas.drawBitmap(bmp, screenPts.x - (bmp.getWidth() / 2), screenPts.y - bmp.getHeight(), new Paint());

而不是：

canvas.drawBitmap(bmp, screenPts.x + 50, screenPts.y - 70, null);