Android中通过当前经纬度获得城市

package com.yy;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.Attributes;import org.xml.sax.InputSource;import org.xml.sax.SAXException;import org.xml.sax.XMLReader;import org.xml.sax.helpers.DefaultHandler;import android.content.Context;import android.location.Location;import android.location.LocationManager;public class GetCity {/** * 借助Google MAP 通过用户当前经纬度 获得用户当前城市 */static final String GOOGLE_MAPS_API_KEY = "abcdefg";private LocationManager locationManager;private Location currentLocation;private String city="全国";public GetCity(Context context) {this.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);//只是简单的获取城市 不需要实时更新 所以这里先注释//this.locationManager.requestLocationUpdates(//LocationManager.GPS_PROVIDER,  1000, 0,//new LocationListener() {//public void onLocationChanged(Location loc) {////当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发 //// Save the latest location//currentLocation = loc;//// Update the latitude & longitude TextViews//System.out//.println("getCity()"//+ (loc.getLatitude() + " " + loc//.getLongitude()));//}////public void onProviderDisabled(String arg0) {//System.out.println(".onProviderDisabled(关闭)"+arg0);//}////public void onProviderEnabled(String arg0) {//System.out.println(".onProviderEnabled(开启)"+arg0);//}////public void onStatusChanged(String arg0, int arg1,//Bundle arg2) {//System.out.println(".onStatusChanged(Provider的转态在可用、" +//"暂时不可用和无服务三个状态直接切换时触发此函数)"+//arg0+" "+arg1+" "+arg2);//}//});currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);if (currentLocation == null)currentLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);}/** * 开始解析 */public void start() {if(currentLocation!=null){new Thread(){public void run(){String temp=reverseGeocode(currentLocation);if(temp!=null&&temp.length()>=2)city=temp;}}.start();}else{System.out.println("GetCity.start()未获得location");}}/** * 获得城市  * @return */public String getCity(){return city;}/** * 通过Google  map api 解析出城市 * @param loc * @return */public String reverseGeocode(Location loc) {// http://maps.google.com/maps/geo?q=40.714224,-73.961452&output=json&oe=utf8&sensor=true_or_false&key=your_api_keyString localityName = "";HttpURLConnection connection = null;URL serverAddress = null;try {// build the URL using the latitude & longitude you want to lookup// NOTE: I chose XML return format here but you can choose something// elseserverAddress = new URL("http://maps.google.com/maps/geo?q="+ Double.toString(loc.getLatitude()) + ","+ Double.toString(loc.getLongitude())+ "&output=xml&oe=utf8&sensor=true&key="+ GOOGLE_MAPS_API_KEY);// set up out communications stuffconnection = null;// Set up the initial connectionconnection = (HttpURLConnection) serverAddress.openConnection();connection.setRequestMethod("GET");connection.setDoOutput(true);connection.setReadTimeout(10000);connection.connect();try {InputStreamReader isr = new InputStreamReader(connection.getInputStream());InputSource source = new InputSource(isr);SAXParserFactory factory = SAXParserFactory.newInstance();SAXParser parser = factory.newSAXParser();XMLReader xr = parser.getXMLReader();GoogleReverseGeocodeXmlHandler handler = new GoogleReverseGeocodeXmlHandler();xr.setContentHandler(handler);xr.parse(source);localityName = handler.getLocalityName();System.out.println("GetCity.reverseGeocode()"+localityName);} catch (Exception ex) {ex.printStackTrace();}} catch (Exception ex) {ex.printStackTrace();System.out.println("GetCity.reverseGeocode()"+ex);}return localityName;}/** * The final piece of this puzzle is parsing the xml that is returned from * google’s service. For this example I am using the java SAX (simple api * for xml) parser. The final class to show here is * GoogleReverseGeocodeXmlHandler. In my example, I only want the name of * the city the user is in, so my XmlHandler class I’m about to show only * parses that piece of information. If you want to grab more complete * information (I’ll also give an example file that contains the XML * returned by Google), you’ll have to add more to this class *  * @author Administrator *  */public class GoogleReverseGeocodeXmlHandler extends DefaultHandler {private boolean inLocalityName = false;private boolean finished = false;private StringBuilder builder;private String localityName;public String getLocalityName() {return this.localityName;}@Overridepublic void characters(char[] ch, int start, int length)throws SAXException {super.characters(ch, start, length);if (this.inLocalityName && !this.finished) {if ((ch[start] != '\n') && (ch[start] != ' ')) {builder.append(ch, start, length);}}}@Overridepublic void endElement(String uri, String localName, String name)throws SAXException {super.endElement(uri, localName, name);if (!this.finished) {if (localName.equalsIgnoreCase("LocalityName")) {this.localityName = builder.toString();this.finished = true;}if (builder != null) {builder.setLength(0);}}}@Overridepublic void startDocument() throws SAXException {super.startDocument();builder = new StringBuilder();}@Overridepublic void startElement(String uri, String localName, String name,Attributes attributes) throws SAXException {super.startElement(uri, localName, name, attributes);if (localName.equalsIgnoreCase("LocalityName")) {this.inLocalityName = true;}}}}
参考：
http://kryptonum.iteye.com/blog/363950
http://www.cnblogs.com/transmuse/archive/2010/12/31/1923358.html
http://blog.csdn.net/dadoneo/archive/2011/03/18/6259781.aspx
http://www.ispiders.net/?p=325
http://www.smnirven.com/?p=39#
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