百度地图聚合

一、牛人们的想法

下面是我参考的有关的博客，下面将一一列举

1.MarkerCluster之百度地图版  http://hi.baidu.com/liongg/item/d8adece188fbfb11585dd89f

2.Marker Cluster面面观 http://hi.baidu.com/liongg/item/a380cc95bd70c2bdcd80e581

3.GoogleMap标注物聚合解决办法 http://www.svennerberg.com/2009/01/handling-large-amounts-of-markers-in-google-maps/

4.百度地图官网上已经有JS版的标注物聚合实例与原文件，建议看百度地图上的代码，规范且函数注释明确。

百度地图javascript开源库：  http://developer.baidu.com/map/library.htm

二、我的思路

1.下面以一个流程图来表述我的想法。

2.下面贴出代码

 <span style="font-family:KaiTi_GB2312;"><span style="font-size:18px;">//cluster聚合器类  
 package com.zhl.map;  
  
 import java.util.ArrayList;  
 import java.util.List;  
  
 import android.graphics.Bitmap;  
 import android.graphics.Point;  
 import android.graphics.drawable.BitmapDrawable;  
 import android.util.Log;  
 import android.view.LayoutInflater;  
 import android.view.View;  
 import android.widget.TextView;  
 import baidumapsdk.demo.R;  
  
  
 import com.baidu.mapapi.cloud.Bounds;  
 import com.baidu.mapapi.map.MapView;  
 import com.baidu.mapapi.map.OverlayItem;  
 import com.baidu.mapapi.utils.DistanceUtil;  
 import com.baidu.platform.comapi.basestruct.GeoPoint;  
 import com.zhl.activity.MarkerClusterActivity;  
 import com.zhl.util.MapUtils;  
  
 public class Cluster{  
  
     private MarkerClusterActivity mMarkCluster;  
     private MapView mMapView;  
     private int mMinClusterSize;  
     private Boolean isAverageCenter;  
     private int mGridSize;  
     private double mDistance;  
  
     private List<ClusterMarker> mMarkers;  
  
  
     public Cluster(MarkerClusterActivity markCluster,MapView mapView  
             ,int minClusterSize,Boolean isAverageCenter  
             ,int mGridSize,double mDistance) {  
  this.mMarkCluster = markCluster;  
  this.mMapView = mapView;  
  this.mMinClusterSize = minClusterSize;  
  this.isAverageCenter = isAverageCenter;  
  this.mGridSize = mGridSize;  
  this.mDistance = mDistance;  
  mMarkers = new ArrayList<ClusterMarker>();  
     }  
  
     public List<OverlayItem> createCluster(List<OverlayItem> markerList){  
         this.mMarkers.clear();  
         List<OverlayItem> itemList = new ArrayList<OverlayItem>();  
         for(int i=0;i<markerList.size();i++){  
             addCluster(markerList.get(i));  
         }  
         for(int i=0;i<mMarkers.size();i++){  
             ClusterMarker cm = mMarkers.get(i);  
             setClusterDrawable(cm);  
             OverlayItem oi = new OverlayItem(cm.getmCenter(),cm.getTitle(),cm.getSnippet());  
             oi.setMarker(cm.getMarker());  
             itemList.add(oi);  
         }  
         return itemList;  
     }  
  
     private void addCluster(OverlayItem marker){  
         GeoPoint markGeo = marker.getPoint();  
         if(mMarkers.size()==0){  
             ClusterMarker clusterMarker = new ClusterMarker(marker.getPoint(), marker.getTitle(), marker.getSnippet());  
             clusterMarker.setMarker(marker.getMarker());  
             clusterMarker.AddMarker(marker, isAverageCenter);  
             Bounds bound = new Bounds(markGeo.getLatitudeE6(),markGeo.getLongitudeE6(),markGeo.getLatitudeE6(),markGeo.getLongitudeE6());  
  bound = MapUtils.getExtendedBounds(mMapView, bound, mGridSize);  
             clusterMarker.setmGridBounds(bound);  
             mMarkers.add(clusterMarker);  
         }else{  
             ClusterMarker clusterContain = null;  
             double distance = mDistance;  
             for(int i=0;i<mMarkers.size();i++){  
                 ClusterMarker clusterMarker = mMarkers.get(i);  
                 GeoPoint center = clusterMarker.getmCenter();  
                 double d = DistanceUtil.getDistance(center, marker.getPoint());  
                 if(d<distance){  
  distance = d;  
  clusterContain = clusterMarker;  
                 }  
             }  
             if(clusterContain == null||!isMarkersInCluster(markGeo, clusterContain.getmGridBounds())){  
                 ClusterMarker clusterMarker = new ClusterMarker(marker.getPoint(), marker.getTitle(), marker.getSnippet());  
                 clusterMarker.AddMarker(marker, isAverageCenter);  
  
                 clusterMarker.AddMarker(marker, isAverageCenter);  
                 Bounds bound = new Bounds(markGeo.getLatitudeE6(),markGeo.getLongitudeE6(),markGeo.getLatitudeE6(),markGeo.getLongitudeE6());               bound = MapUtils.getExtendedBounds(mMapView, bound, mGridSize);  
                 clusterMarker.setmGridBounds(bound);  
  
                 mMarkers.add(clusterMarker);  
             }else{  
                 clusterContain.AddMarker(marker, isAverageCenter);  
             }  
  
         }  
     }  
  
     private void setClusterDrawable(ClusterMarker clusterMarker){  
         View drawableView = LayoutInflater.from(mMarkCluster).inflate(  
                 R.layout.drawable_mark, null);  
         TextView text = (TextView) drawableView.findViewById(R.id.drawble_mark);  
         int markNum = clusterMarker.getmMarkers().size();  
         if(markNum>=2){  
             text.setText(markNum+"");  
             if(markNum<11){  
                 text.setBackgroundResource(R.drawable.m0);  
             }else if(markNum>10&&markNum<21){  
                 text.setBackgroundResource(R.drawable.m1);  
             }else if(markNum>20&&markNum<31){  
                 text.setBackgroundResource(R.drawable.m2);  
             }else if(markNum>30&&markNum<41){  
                 text.setBackgroundResource(R.drawable.m3);  
             }else{  
                 text.setBackgroundResource(R.drawable.m4);  
             }  
             Bitmap bitmap = MapUtils.convertViewToBitmap(drawableView);  
             clusterMarker.setMarker(new BitmapDrawable(bitmap));  
         }else{  
  
         }  
     }  
  
     private Boolean isMarkersInCluster(GeoPoint markerGeo,Bounds bound){  
         if(markerGeo.getLatitudeE6()>bound.leftBottom.getLatitudeE6()  
                 &&markerGeo.getLatitudeE6()<bound.rightTop.getLatitudeE6()  
                 &&markerGeo.getLongitudeE6()>bound.rightTop.getLongitudeE6()  
                 &&markerGeo.getLongitudeE6()<bound.leftBottom.getLongitudeE6()){  
             return true;  
         }  
         return false;  
  
     }  
 }</span></span> 

3.工程demo代码下载，地图标注物聚合.zip

4.下面是程序的实例图片