是否可以将尺寸设置为与地图缩放级别无关的groundOverlay？

Question

我有一个GroundOverlay在我身上GoogleMap,我希望当我在地图上放大/缩小时它的尺寸不会改变.完全像默认地图markers,始终保持其尺寸.我尝试了两种形式,GroundOverlay.setDimensions()但图像仍然在缩放时调整大小.这是我的代码:

 Bitmap btm = BitmapFactory.decodeResource(getResources(), R.drawable.map_arrow);
 BitmapDescriptor arrow = BitmapDescriptorFactory.fromBitmap(btm);
 float w = btm.getWidth();
 float h = btm.getHeight();

if (groundOverlay != null) groundOverlay.remove();
 groundOverlay = mMap.addGroundOverlay(new GroundOverlayOptions()
            .image(arrow).position(meLoc, w,h).bearing(bearAngle));
 groundOverlay.setDimensions(1000);

Answer 1

您有覆盖层的宽度和高度，并根据您的缩放级别将其放置在地图上。对于该缩放级别来说似乎不错。正确的？现在您可以计算半径并获取地图屏幕的米数。因为地图背景叠加的宽度和高度值为米。我们必须使用仪表而不是缩放级别或其他任何东西。也许有人可以找到更好的解决方案，但我尝试了太多方法，最终得到了这个解决方案，而且效果很好。

    float zoomLevel=mMap.getCameraPosition().zoom;
    //calculate meters*********************         
    myBounds = mMap.getProjection().getVisibleRegion().latLngBounds;
    myCenter=  mMap.getCameraPosition().target;
    if (myCenter.latitude==0 || myCenter.longitude==0) {
        myCenter=new LatLng(myLocation.getLatitude(),myLocation.getLongitude());
    }

    LatLng ne = myBounds.northeast;

    // r = radius of the earth in statute miles
    double r = 3963.0;  

    // Convert lat or lng from decimal degrees into radians (divide by 57.2958)
    double lat1 = myCenter.latitude / 57.2958; 
    double lon1 = myCenter.longitude / 57.2958;
    final double lat2 = ne.latitude / 57.2958;
    final double lon2 = ne.longitude / 57.2958;

    // distance = circle radius from center to Northeast corner of bounds
    double dis = r * Math.acos(Math.sin(lat1) * Math.sin(lat2) + 
      Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1));

    //1 Meter = 0.000621371192237334 Miles
    double meters_calc=dis/0.000621371192237334;

    float factor=1;  
    if (zoomLevel==15) {  // my default zoom level yours can be different
        metersoverlay=meters_calc;  // global variable metersoverlay set
    }
    else { // if my zoom level change then I have to calculate dimension scale factor
        factor=(float) (meters_calc/metersoverlay); 
    }

    //******************************* now we are ready to set dimension of background overlay
    float dimensions=1000*factor; 
    loadingGroundOverlayBg.setDimensions(dimensions);

我希望它对你们所有人都有效:)