Android:Skobbler,如何限制某个区域的地图视图?

时间:2015-08-28 09:55:16

标签: android skmaps

我不仅是Skobbler的新手,也是Map的新手。这时,我正在尝试创建一个只显示一个区域的mapp应用程序。

而且,我想要的是:

  • 用户无法离开该区域。
  • 不要在该区域外加载任何东西(标题,..)。
  • 用户只能查看和放大。

我尝试了下面的绑定,但它不起作用:

SKBoundingBox boundingBox = new SKBoundingBox(47.087426, 8.257230, 46.874277, 8.637632);
mapView.fitBoundingBox(boundingBox, 0, 0);

请你提一些提示吗?

1 个答案:

答案 0 :(得分:2)

目前,SDK不支持将地图操作限制为边界框。

作为一种解决方法,每当屏幕上可见的地图区域发生变化(由于平移,缩放或旋转)并且它超出定义的边界框时,地图将切换回内部的最后一个可见区域那个边界框:

public class MapActivity extends Activity implements SKMapSurfaceListener, ... { 

... 
// the box inside which map operations are allowed 
private SKBoundingBox box = new SKBoundingBox(47.087426, 8.257230, 46.874277, 8.637632); 

// last region that was visible on the screen and was inside the box 
private SKCoordinateRegion lastValidRegion = null; 

... 

@Override 
    public void onSurfaceCreated(SKMapViewHolder mapHolder) { 
... 
// position the map somewhere inside your box 
mapView.centerMapOnPosition(new SKCoordinate(8.304354, 47.050253)); 
} 

... 

// checks if a given region is inside the bounding box 
private boolean isInBoundingBox(SKCoordinateRegion newRegion) { 
        SKBoundingBox newBoundingBox = mapView.getBoundingBoxForRegion(newRegion); 
        if (newBoundingBox.getTopLeftLatitude() > box.getTopLeftLatitude() || newBoundingBox.getBottomRightLatitude() < box.getBottomRightLatitude() || 
                newBoundingBox.getTopLeftLongitude() < box.getTopLeftLongitude() || newBoundingBox.getBottomRightLongitude() > box.getBottomRightLongitude()) { 
            return false; 
        } 
        return true; 
    } 

@Override 
    public void onMapRegionChanged(SKCoordinateRegion mapRegion) { 
        boolean inBoundingBox = isInBoundingBox(mapRegion); 
        if (inBoundingBox) { 
// if mapRegion is valid save it 
            if (lastValidRegion == null) { 
                lastValidRegion = new SKCoordinateRegion(mapRegion.getCenter(), mapRegion.getZoomLevel()); 
            } else { 
                lastValidRegion.setCenter(mapRegion.getCenter()); 
                lastValidRegion.setZoomLevel(mapRegion.getZoomLevel()); 
            } 
        } else { 
// if mapRegion is invalid reposition the map inside the bounding box 
            if (lastValidRegion != null) { 
                mapView.changeMapVisibleRegion(lastValidRegion, false); 
            } 
        } 
    } 

} 

此外,如果需要,还可以使用SKMapSettings.setZoomLimits(...)方法将限制应用于缩放级别。