安卓：Skobbler，如何限制在一个区域地图视图？ [英] Android: Skobbler, how to limit map view in an area?

问题描述

我是新不仅对Skobbler也为地图。在这个时候，我试图创造一个MAPP应用程序，只显示一个区域。

I'm new not only on Skobbler but also for Map. At this time, i'm trying to create a mapp app that show only an area.

和，我想要是：

• 用户不能迁出该区域的。


• 请不要加载该区域以外的任何东西（头衔，..）。


• 用户可以查看和只能放大。

我试过约束象下面，但它不工作：

I tried with bound like below but it not work:

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

您能否给一些提示，请？

Could you give some hint, please?

推荐答案

目前的SDK不支持限制图表操作的边界盒。

Currently the SDK does not support limiting map operations to a bounding box.

作为解决办法，每当地图区域就是在屏幕上的变化可见（如平移，缩放或旋转的结果），它去定义的边界框之外，地图将切换到最后一个可见区域，这是内部的该边界框：

As a workaround, whenever the map region that is visible on the screen changes (as a result of panning, zooming or rotation) and it goes outside the defined bounding box the map will switch back to the last visible region that was inside that bounding box:

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，如果需要的话，限制也可以应用于放大使用SKMapSettings.setZoomLimits水平（...）方法

Also, if needed, limits can also be applied to zoom levels using the SKMapSettings.setZoomLimits(...) method.

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