android 根据经纬度定位所在城市

package com.studio.android.chp08.ex01;


import java.io.IOException;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;

public class CurrentLocation extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LocationManager locationManager;
        String serviceName = Context.LOCATION_SERVICE;
        locationManager = (LocationManager)getSystemService(serviceName);
//        String provider = LocationManager.GPS_PROVIDER;
        String provider = LocationManager.NETWORK_PROVIDER;
        
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setCostAllowed(true);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
//        String provider = locationManager.getBestProvider(criteria, true);
        
        Location location = locationManager.getLastKnownLocation(provider);
        updateWithNewLocation(location);
        locationManager.requestLocationUpdates(provider, 2000, 10,
        		locationListener);
    }
   private final LocationListener locationListener = new LocationListener() {
    	public void onLocationChanged(Location location) {
    	updateWithNewLocation(location);
    	}
    	public void onProviderDisabled(String provider){
    	updateWithNewLocation(null);
    	}
    	public void onProviderEnabled(String provider){ }
    	public void onStatusChanged(String provider, int status,
    	Bundle extras){ }
    };
    private void updateWithNewLocation(Location location) {
    	String latLongString;
    	TextView myLocationText;
    	myLocationText = (TextView)findViewById(R.id.myLocationText);
    	if (location != null) {
    	double lat = location.getLatitude();
    	double lng = location.getLongitude();
    	latLongString = "纬度:" + lat + "\n经度:" + lng;
    	} else {
    	latLongString = "无法获取地理信息";
    	}
    	List<Address> addList = null;
    	Geocoder ge = new Geocoder(this);
    	try {
			addList = ge.getFromLocation(24.463, 118.1, 1);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	if(addList!=null && addList.size()>0){
    		for(int i=0; i<addList.size(); i++){
    			Address ad = addList.get(i);
    			latLongString += "\n";
    			latLongString += ad.getCountryName() + ";" + ad.getLocality();
    		}
    	}
    	myLocationText.setText("您当前的位置是:\n" +latLongString);
    }
}