Android中通过当前经纬度获得城市

Android中通过当前经纬度获得城市

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_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