获取地理位置

public class LocationUtil {

	public static void getLoc(Context context){
		LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE );
		Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
		final long maxAgeMilliSeconds = 1000 * 60 * 1; // 1 minute
		final long maxAgeNetworkMilliSeconds = 1000 * 60 * 10; // 10 minutes
		final long now = System.currentTimeMillis();
		if(location==null || location.getTime() <now - maxAgeMilliSeconds){
			location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
			if(location == null || location.getTime() < now - maxAgeNetworkMilliSeconds){
				//ͨ  cellid  λ
				TelephonyManager telephonyManager = (TelephonyManager)context
				.getSystemService(Context.TELEPHONY_SERVICE);
				GsmCellLocation gsmCellLocation = (GsmCellLocation) telephonyManager.getCellLocation();
				if (gsmCellLocation != null){
					int cid = gsmCellLocation.getCid();
					int lac = gsmCellLocation.getLac();
					int mnc = Integer.valueOf(telephonyManager.getNetworkOperator().substring(3, 5));
					AppContext.currLoc= getLocationByCell(cid, lac, mnc);
				}
			}else{
				//    γ ȱ  浽 ڴ 
				AppContext.currLoc = new LoctionInfo(String.valueOf(location.getLatitude()),String.valueOf(location.getLongitude()));
				
			}
		}
	}
	
	public static City getCurrCity(Context context){
		LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE );
		Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
		final long maxAgeMilliSeconds = 1000 * 60 * 1; // 1 minute
		final long maxAgeNetworkMilliSeconds = 1000 * 60 * 10; // 10 minutes
		final long now = System.currentTimeMillis();
		if(location==null || location.getTime() <now - maxAgeMilliSeconds){
			location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
			if(location == null || location.getTime() < now - maxAgeNetworkMilliSeconds){
				//ͨ  cellid  λ
				TelephonyManager telephonyManager = (TelephonyManager)context
				.getSystemService(Context.TELEPHONY_SERVICE);
				GsmCellLocation gsmCellLocation = (GsmCellLocation) telephonyManager.getCellLocation();
				if (gsmCellLocation != null){
					int cid = gsmCellLocation.getCid();
					int lac = gsmCellLocation.getLac();
					int mnc = Integer.valueOf(telephonyManager.getNetworkOperator().substring(3, 5));
					AppContext.currLoc= getLocationByCell(cid, lac, mnc);
				}
			}else{
				//    γ ȱ  浽 ڴ 
				AppContext.currLoc = new LoctionInfo(String.valueOf(location.getLatitude()),String.valueOf(location.getLongitude()));
				
			}
		}
		if(AppContext.currLoc!=null){
			context.getSharedPreferences("locInfo", context.MODE_WORLD_WRITEABLE)
			.edit().putString("currlat",AppContext.currLoc.getLat())
			.putString("currlng",AppContext.currLoc.getLon())
			.commit();
			//  server        
			String latlng = AppContext.currLoc.getLat()+","+AppContext.currLoc.getLon();
			String reqUrl = "http://ditu.google.cn/maps/geo?output=json&key=abcdef&q="+latlng;
			City city = sendToServer(reqUrl);
			if(city!=null&& city.getCityName()!=null){
				//  ȡ   س      
				if(AppContext.arrayList!=null){
					if(AppContext.arrayList.contains(city)){
						City city2 = (City) AppContext.arrayList.get(AppContext.arrayList.indexOf(city));
						return city2;
					}
				}
				ResultData resultData;
				String cityJson = StringUtil.readCityJson(context);
				if(cityJson!=null && !"".equals(cityJson)){
					resultData = ParseManger.getCityList(cityJson,context);
				}else{
					String param = "?ctype=iphone&m=get_citylist";
					String cityUrl = APIContants.API+param;
					String response = NetManger.doPost(cityUrl, null);
					resultData = ParseManger.getCityList(response,context);
				}
				if(resultData!=null && resultData.getArrayList()!=null){
					ArrayList arrayList= resultData.getArrayList();
					if(arrayList.contains(city)){
						City city2 = (City) arrayList.get(arrayList.indexOf(city));
						return city2;
					}
				}
		}
		}
		return new City("北京", "bei_jing");//如果取不到城市，则默认返回北京
	}
	
	public static final String MAPABC_KEY = "4726f4e7aa32db60204e6c05d7e41ada440055e47021072e45322d670324223eedbbd89f7b0788d2";
	public static String MAPAPC_INTERFACE_URL = "http://search1.mapabc.com/sisserver";

	// config config=BSPS           
	// mnc mnc=  Ӫ ̱ ʶ
	// lac lac=λ ñ   
	// cellid cellid=  վID
	// a_k a_k=api key  û      key
	/**
	 *  lat, lon
	 */
	private static LoctionInfo getLocationByCell(int cid, int lac, int mnc) {
		StringBuilder url = new StringBuilder(MAPAPC_INTERFACE_URL);
		url.append("?config=BSPS&mnc=").append(mnc).append("&lac=").append(lac).append("&cellid=").append(cid).append(
				"&a_k=").append(MAPABC_KEY);
		String xCoord = "-1";
		String yCoord = "-1";
		HttpClient httpClient = new DefaultHttpClient();
		LogUtil.printInfo("url.toString() : "+url.toString());
		HttpGet request = new HttpGet(url.toString());
		try {
			HttpResponse response = httpClient.execute(request);
			HttpEntity entity = response.getEntity();
			InputStream is = entity.getContent();
			
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document dom = builder.parse(is);
			Element root = dom.getDocumentElement();
			NodeList personNodes = root.getElementsByTagName("location");
			String lat=null,lon=null;
			for(int i=0 ; i<personNodes.getLength(); i++){
				Element personNode = (Element)personNodes.item(i);
				NodeList childNodes = personNode.getChildNodes();
				for(int j=0 ; j < childNodes.getLength(); j++){
					Node childNode = childNodes.item(j);
					if(childNode.getNodeType()==Node.ELEMENT_NODE){
						Element element = (Element)childNode;
						if("cenx".equals(childNode.getNodeName())){
							lon = element.getFirstChild().getNodeValue();
						}else if("ceny".equals(childNode.getNodeName())){
							lat = element.getFirstChild().getNodeValue();
						}
					}
				}
			}
			if(lat!=null && lon !=null){
				return new LoctionInfo(lat,lon);
			}
			
			/*XmlPullParser pullParser = Xml.newPullParser();
			pullParser.setInput(is, "GBK");
			int eventType = pullParser.getEventType();
			while (eventType != XmlPullParser.END_DOCUMENT) {
				switch (eventType) {
				case XmlPullParser.START_TAG:
					if ("cenx".equals(pullParser.getName())) {
						xCoord = pullParser.nextText();
					} else if ("ceny".equals(pullParser.getName())) {
						yCoord = pullParser.nextText();
					}
					break;
				}
				eventType = pullParser.next();
			}*/
			/*if (!xCoord.equals("-1") && !yCoord.equals("-1")) {
				return new LoctionInfo(xCoord,yCoord);
			} else {
				return null;
			}*/
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
		return null;
	}
	
	public static String convertStreamToString(InputStream is) {
		StringBuilder sb = new StringBuilder();
		try {
		BufferedReader reader = new BufferedReader(new InputStreamReader(is,"gb2312"));

		String line = null;
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}


	private static City sendToServer(String reqUrl) {
		City city=null;
		try {
			URL url = new URL(reqUrl);
			LogUtil.printInfo("reqUrl : "+reqUrl);
			String response = NetManger.convertStreamToString(url.openStream());
			city = ParseManger.getCurrCity(response);
//			LogUtil.printInfo("response : "+response);
//			LogUtil.printInfo("city : "+city);
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
		return city;
	}
	
}