LocationManager操作

 LocationManager mLocationManager;
        Location mLocation;
        
        mLocationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
        tv = (TextView)findViewById(R.id.text);
        
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        String locationprovider = mLocationManager.getBestProvider(criteria, true);
        
        mLocationManager.requestLocationUpdates(locationprovider, 5000, (float) 1.0, this);
　　　　

// mLocation = mLocationManager.getLastKnownLocation(locationprovider); //一开始不要使用，容易返回null
        tv.setText("Last location lat :" + mLocation.getLatitude());

public void onLocationChanged(Location location) {
        // TODO Auto-generated method stub
        //Toast.makeText(getApplicationContext(), "location", Toast.LENGTH_LONG).show();
        mLocation = location;
        showupdate();
         List<Address> addresses;
            try {
                Geocoder mGC = new Geocoder(this, Locale.ENGLISH);
                addresses = mGC.getFromLocation(mLocation.getLatitude(), mLocation.getLongitude(),1);
                
                if(addresses != null){
                    Address currentAddress = addresses.get(0);
                    StringBuilder sb = new StringBuilder("Address:\n");
                    for(int i=0;i<currentAddress.getMaxAddressLineIndex();i++){
                        sb.append(currentAddress.getAddressLine(i)).append("\n");
                    }
                    
                    tv.setText(sb.toString());
                }
            } catch (Exception e) {
                // TODO: handle exception
                //Toast.makeText(getApplicationContext(), "error."+e.getMessage(), Toast.LENGTH_LONG).show();
                 
                if(location != null)
                {
                    double x = location.getLatitude();
                    double y = location.getLongitude();
                    String address = "http://maps.google.cn/maps/api/geocode/xml?latlng="+x+","+y+"&sensor=true&language=zh-CN";
                    //http://maps.google.cn/maps/api/geocode/xml?latlng=31.2398790,121.4996740&sensor=true&language=zh-CN
                    try {
                        URL url = new URL(address);
                        HttpURLConnection http = (HttpURLConnection)url.openConnection();
                        InputStream input = http.getInputStream();
                        byte[] bt = new byte[1024];
                        int n;
                        StringBuilder sb =new StringBuilder();
                        while((n=input.read(bt, 0, bt.length))!= -1){
                            sb.append(new String(bt,0,n));
                        }
                        
                        
                    } catch (MalformedURLException e1) {
                        // TODO Auto-generated catch block
                        Toast.makeText(getApplicationContext(), "url error", Toast.LENGTH_LONG).show();
                        e1.printStackTrace();
                    } catch (IOException ee) {
                        // TODO Auto-generated catch block
                        ee.printStackTrace();
                    }
                    
                }
            }
        
        //showupdate();
        
        
    }

    private void showupdate() {
        // TODO Auto-generated method stub
        tv.setText("Last location lat :" + mLocation.getLatitude()+" long:"+mLocation.getLongitude());
    }
 

    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        
    }

    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
        
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub
        
    }