Android中通過當前經緯度獲得城市

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 通過用戶當前經緯度 獲得用戶當前城市   */  static final String GOOGLE_MAPS_API_KEY = "abcdefg";    private LocationManager locationManager;  private Location currentLocation;  private String city="全國";  public GetCity(Context context) {   this.locationManager = (LocationManager) context     .getSystemService(Context.LOCATION_SERVICE);   //只是簡單的獲取城市 不需要實時更新 所以這裡先注釋 //  this.locationManager.requestLocationUpdates( //    LocationManager.GPS_PROVIDER,  1000, 0, //    new LocationListener() { //     public void onLocationChanged(Location loc) { //      //當坐標改變時觸發此函數，如果Provider傳進相同的坐標，它就不會被觸發  //      // 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(關閉)"+arg0); //     } // //     public void onProviderEnabled(String arg0) { //      System.out.println(".onProviderEnabled(開啟)"+arg0); //     } // //     public void onStatusChanged(String arg0, int arg1, //       Bundle arg2) { //      System.out.println(".onStatusChanged(Provider的轉態在可用、" + //        "暫時不可用和無服務三個狀態直接切換時觸發此函數)"+ //        arg0+" "+arg1+" "+arg2); //     } //    });   currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);     if (currentLocation == null)    currentLocation = locationManager      .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);  }  /**   * 開始解析   */  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()未獲得location");   }  }    /**   * 獲得城市    * @return   */  public String getCity(){   return city;  }    /**   * 通過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_key   String 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    // else    serverAddress = 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 stuff    connection = null;      // Set up the initial connection    connection = (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 tha