百度地图聚合

来源：互联网发布：软件测试考试证书编辑：程序博客网时间：2024/05/21 02:52

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

[html] view plaincopy
<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

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