GIS的学习（三十四）osmdroid OSMBonusPack实现POI查询并标记气泡

    使用osmbonusPack查询附近的POI并标记实现代码如下：

package com.osmbonus.simple;

import java.util.ArrayList;

import org.osmdroid.bonuspack.location.NominatimPOIProvider;
import org.osmdroid.bonuspack.location.POI;
import org.osmdroid.bonuspack.overlays.ExtendedOverlayItem;
import org.osmdroid.bonuspack.overlays.ItemizedOverlayWithBubble;
import org.osmdroid.tileprovider.tilesource.TileSourceFactory;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.OverlayItem;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
/**
 * 
 * 查询相关的POI并标记marker和气泡
 * 
 * 备注：需要的注意事项：
 *   1.针对OSMBonusPack v2.x jars 是基于 osmdroid v3.0.8.  所以版本必须对应否则可能出现莫名其妙的问题。
 *   2.以下是集成必须的资源信息
 *      •For a white bubble: 
 *			◦drawable-mpi/bonuspack_bubble.9.png 
 *			◦layout/bonuspack_bubble.xml 
 *			•For a dark-grey bubble: 
 *			◦drawable-mpi/bonuspack_bubble_black.9.png 
 *			◦layout/bonuspack_bubble_black.xml 
 *		•For the "more info" button: 
 *			◦drawable/btn_moreinfo.xml 
 *			◦drawable-mpi/moreinfo_arrow.png 
 *			◦drawable-mpi/moreinfo_arrow_pressed.png 
 *   3.地图使用的权限总结：
 *          <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> 
 * 			<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
 * 			<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
 * 			<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 * 			<uses-permission android:name="android.permission.INTERNET" />
 * 			<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 *
 *针对OSMBonusPack中几个重要的特性：
 *   1.根据地点名称查询POI
 *   2.查询附近的POI
 *   3.根据起始点规划线路
 *   4.marker气泡重写和定制
 *   5.地图poi点的响应处理
 *   
 *   
 *   
 *   @author longgangbai
 *   
 *  以下代码均来自官方Tutorial_1 整理 
 *  
 */
public class OSMBonusPackSimpleActivity extends Activity {
	private MapView map;
	private ItemizedOverlayWithBubble<ExtendedOverlayItem> poiMarkers;
    /** Called when the activity is first created. */
    @Override 
    public void onCreate(Bundle savedInstanceState) {         
    	super.onCreate(savedInstanceState);        
    	setContentView(R.layout.main);       
    	//获取地图对象
    	map = (MapView) findViewById(R.id.map);   
    	//设置地图图源
    	map.setTileSource(TileSourceFactory.MAPNIK);  
    	//设置起始点和中心
    	GeoPoint startPoint = new GeoPoint(48.13, -1.63);         
    	MapController mapController = map.getController();         
    	mapController.setCenter(startPoint);        
    	mapController.setZoom(9);  

    	final ArrayList<ExtendedOverlayItem> poiItems = new ArrayList<ExtendedOverlayItem>(); 
    	poiMarkers = new ItemizedOverlayWithBubble<ExtendedOverlayItem>(this,poiItems, map); 
    	NominatimPOIProvider poiProvider = new NominatimPOIProvider(); 
    	//查询服务的该点的附近的atm
    	ArrayList<POI> pois = poiProvider.getPOICloseTo(startPoint, "atm", 50, 0.1);
    	//ArrayList<POI> pois = poiProvider.getPOIAlong(road.getRouteLow(), "fuel", 50, 2.0);
    	
    	//Wikipedia POIs with GeoNames 需要申请Account
    	//GeoNamesPOIProvider poiProvider = new GeoNamesPOIProvider("YOUR_GEONAMES_ACCOUNT"); 
    	//BoundingBoxE6 bb = map.getBoundingBox(); 
    	//ArrayList<POI> pois = poiProvider.getPOIInside(bb, 75);
    	
    	//采用 Flickr 需要申请API KEY
    	//FlickrPOIProvider poiProvider = new FlickrPOIProvider("YOUR_FLICKR_API_KEY"); 
    	//BoundingBoxE6 bb = map.getBoundingBox(); 
    	//ArrayList<POI> pois = poiProvider.getPOIInside(bb, 20);
    	if(pois!=null){
    	 	for (POI poi	:	pois){                 
        		//设置气泡的信息
        		ExtendedOverlayItem poiMarker = new ExtendedOverlayItem(poi.mType, poi.mDescription,poi.mLocation, map.getContext());                 
        		//设置气泡的默认图标
        		Drawable marker = getResources().getDrawable(R.drawable.marker_poi_default);                 
        		poiMarker.setMarker(marker);  
        		//设置气泡的位置 
        		poiMarker.setMarkerHotspot(OverlayItem.HotspotPlace.CENTER);   
        		//设置POI对应的图标信息
        		if (poi.mThumbnail != null){                         
        			poiMarker.setImage(new BitmapDrawable(poi.mThumbnail));                 
        		}            
        		//添加一个marker点
        		poiMarkers.addItem(poiMarker); 
        	}
    	}
   
    	map.getOverlays().add(poiMarkers);
        
        //刷新地图
        map.invalidate();
    } 
}