2013-01-07 68 views
1

有没有什么常用的方法可以在Google地图中实现Android应用的标记群集?Android中的Google地图标记群集

我有大约10000位置的数据库,并希望在更智能的方式显示在理想情况下它们不仅仅是一个显示这是很少超过一个火柴盒大倾销数千个标记...... ,它应该是可能的从网站URL检索标记,但我不确定使用通常的异步函数从可用性的角度来看甚至是有意义的。

回答

3

Clusterkraf会为你工作。示例应用程序中高级模式中的一个选项是在全球范围内聚集10,000个随机点。集群是在后台线程上完成的,因此即使在较旧的设备上也能很好地工作。使大数据集执行的关键是将“扩展边界因子(透支)”设置为0.它飞行在我的Galaxy Nexus上。

2

下面的代码是为我工作:

主要

   MapView mMapView; 
       private GoogleMap googleMap; 
       ClusterManager<MyItem> mClusterManager; 


         mClusterManager = new ClusterManager<MyItem>(getActivity(), googleMap); 

         mMapView = (MapView) v.findViewById(R.id.mapView); 
         mMapView.onCreate(savedInstanceState); 

         mMapView.onResume();// needed to get the map to display immediately 

         try { 
          MapsInitializer.initialize(getActivity().getApplicationContext()); 
         } catch (Exception e) { 
          e.printStackTrace(); 
         } 

         googleMap = mMapView.getMap(); 

         //below code use in onPost() of Asynctask 
         googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(currentlat,currentlng), 15)); 

             mClusterManager = new ClusterManager<MyItem>(getActivity(), googleMap); 

             googleMap.setOnCameraChangeListener(mClusterManager); 
             googleMap.setOnMarkerClickListener(mClusterManager); 
             CustomRenderer customRenderer = new CustomRenderer(getActivity(), googleMap, mClusterManager);       
             mClusterManager.setRenderer(customRenderer); 


           for(int i=0;i<jarray.length();i++) 
           { 

            JSONObject jobj_root=jarray.getJSONObject(i); 
            JSONObject j_j_record=jobj_root.getJSONObject("Record"); 
            lat=j_j_record.getDouble("latitude"); 
            lng=j_j_record.getDouble("longitude"); 

            Location loc1 = new Location(""); 
            loc1.setLatitude(temp_lat); 
            loc1.setLongitude(temp_lng); 

            Location loc2 = new Location(""); 
            loc2.setLatitude(lat); 
            loc2.setLongitude(lng); 

            float distanceInMeters = loc1.distanceTo(loc2); 
            if(distanceInMeters<2000) 
            { 
             //Toast.makeText(getActivity(), " kresp="+distanceInMeters, 34).show(); 
             MyItem offsetItem = new MyItem(lat,lng); 
              mClusterManager.addItem(offsetItem); 
            } 

           } 

CustomRenderer.class

public class CustomRenderer extends DefaultClusterRenderer<MyItem>{ 

    private boolean shouldCluster = true; 
    private static final int MIN_CLUSTER_SIZE = 1; 

    public CustomRenderer(Context context, GoogleMap map,ClusterManager<MyItem> clusterManager) { 
     super(context, map, clusterManager); 
     // TODO Auto-generated constructor stub 
    } 

    public void setMarkersToCluster(boolean toCluster) 
    { 
     this.shouldCluster = toCluster; 
    } 

    @Override 
    protected boolean shouldRenderAsCluster(Cluster<MyItem> cluster) { 

     if(shouldCluster) 
     { 
      return cluster.getSize() > MIN_CLUSTER_SIZE; 
     } 
     else 
     { 
      return shouldCluster; 
     } 

    } 

} 

MyItem.class

public class MyItem implements ClusterItem { 
    private final LatLng mPosition; 

    public MyItem(double lat, double lng) { 
     mPosition = new LatLng(lat, lng); 
    } 

    @Override 
    public LatLng getPosition() { 
     return mPosition; 
    } 
}