如何使用AsyncTask获取位置

public class FastMainActivity extends Activity {

    Button searchBtn = null;
    Intent locatorService = null;
    AlertDialog alertDialog = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        searchBtn = (Button) findViewById(R.id.searchBtn);

        searchBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                if (!startService()) {
                    CreateAlert(\"Error!\", \"Service Cannot be started\");
                } else {
                    Toast.makeText(FastMainActivity.this, \"Service Started\",
                            Toast.LENGTH_LONG).show();
                }

            }
        });

    }

    public boolean stopService() {
        if (this.locatorService != null) {
            this.locatorService = null;
        }
        return true;
    }

    public boolean startService() {
        try {
            // this.locatorService= new
            // Intent(FastMainActivity.this,LocatorService.class);
            // startService(this.locatorService);

            FetchCordinates fetchCordinates = new FetchCordinates();
            fetchCordinates.execute();
            return true;
        } catch (Exception error) {
            return false;
        }

    }

    public AlertDialog CreateAlert(String title, String message) {
        AlertDialog alert = new AlertDialog.Builder(this).create();

        alert.setTitle(title);

        alert.setMessage(message);

        return alert;

    }

    public class FetchCordinates extends AsyncTask<String, Integer, String> {
        ProgressDialog progDailog = null;

        public double lati = 0.0;
        public double longi = 0.0;

        public LocationManager mLocationManager;
        public VeggsterLocationListener mVeggsterLocationListener;

        @Override
        protected void onPreExecute() {
            mVeggsterLocationListener = new VeggsterLocationListener();
            mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

            mLocationManager.requestLocationUpdates(
                    LocationManager.NETWORK_PROVIDER, 0, 0,
                    mVeggsterLocationListener);

            progDailog = new ProgressDialog(FastMainActivity.this);
            progDailog.setOnCancelListener(new OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    FetchCordinates.this.cancel(true);
                }
            });
            progDailog.setMessage(\"Loading...\");
            progDailog.setIndeterminate(true);
            progDailog.setCancelable(true);
            progDailog.show();

        }

        @Override
        protected void onCancelled(){
            System.out.println(\"Cancelled by user!\");
            progDialog.dismiss();
            mLocationManager.removeUpdates(mVeggsterLocationListener);
        }

        @Override
        protected void onPostExecute(String result) {
            progDailog.dismiss();

            Toast.makeText(FastMainActivity.this,
                    \"LATITUDE :\" + lati + \" LONGITUDE :\" + longi,
                    Toast.LENGTH_LONG).show();
        }

        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub

            while (this.lati == 0.0) {

            }
            return null;
        }

        public class VeggsterLocationListener implements LocationListener {

            @Override
            public void onLocationChanged(Location location) {

                int lat = (int) location.getLatitude(); // * 1E6);
                int log = (int) location.getLongitude(); // * 1E6);
                int acc = (int) (location.getAccuracy());

                String info = location.getProvider();
                try {

                    // LocatorService.myLatitude=location.getLatitude();

                    // LocatorService.myLongitude=location.getLongitude();

                    lati = location.getLatitude();
                    longi = location.getLongitude();

                } catch (Exception e) {
                    // progDailog.dismiss();
                    // Toast.makeText(getApplicationContext(),\"Unable to get Location\"
                    // , Toast.LENGTH_LONG).show();
                }

            }

            @Override
            public void onProviderDisabled(String provider) {
                Log.i(\"OnProviderDisabled\", \"OnProviderDisabled\");
            }

            @Override
            public void onProviderEnabled(String provider) {
                Log.i(\"onProviderEnabled\", \"onProviderEnabled\");
            }

            @Override
            public void onStatusChanged(String provider, int status,
                    Bundle extras) {
                Log.i(\"onStatusChanged\", \"onStatusChanged\");

            }

        }

    }

}

locationManager.requestLocationUpdates(locationManager.GPS_PROVIDER, 0, 0, locationListener);

Looper.prepare()

LocationManager locationManager = (LocationManager)params[0].getSystemService(Context.LOCATION_SERVICE);        

public Location getLocation() 
{

    try 
    {
        locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

        // getting GPS status
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        // getting network status
        isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!isGPSEnabled && !isNetworkEnabled) 
        {
            // no network provider is enabled
            Log.w(\"DOCOMO-2\",\"Network Connection failed\");
        } 
        else 
        {
            this.canGetLocation = true;
            // First get location from Network Provider
            if (isNetworkEnabled) 
            {

                locationManager.requestLocationUpdates(
                        LocationManager.NETWORK_PROVIDER,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                if (locationManager != null) 
                {
                    location = locationManager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) 
                    {
                        latitude = location.getLatitude();
                        longitude = location.getLongitude();
                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (isGPSEnabled) 
            {
                if (location == null) 
                {
                    locationManager.requestLocationUpdates(
                            LocationManager.GPS_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    if (locationManager != null) 
                    {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                        if (location != null) 
                        {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }

                    }
                }
            }
        }
        locationManager=null;
        location=null;

    } 
    catch (Exception e) 
    {
        locationManager=null;
        location=null;
        e.printStackTrace();
    }
    return location;
}