Running GPS positioning in a background thread on Android

void startGPSThread() {    Thread t = new Thread() {        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);             boolean isDebug = CurrentLogEntry.getInstance().isDebug();        // Define a listener that responds to location updates        LocationListener locationListener  = new LocationListener() {            public void onStatusChanged(String provider, int status, Bundle extras) {                /* This is called when the GPS status changes */                String tag = "onStatusChanged, ";                switch (status) {                    case LocationProvider.OUT_OF_SERVICE:                        Log.w(tag, "Status Changed: Out of Service");                        break;                    case LocationProvider.TEMPORARILY_UNAVAILABLE:                        Log.w(tag, "Status Changed: Temporarily Unavailable");                        break;                    case LocationProvider.AVAILABLE:                        break;                }            }            public void onProviderEnabled(String provider) {            }            public void onProviderDisabled(String provider) {                // This is called if the GPS is disabled in settings.                // Bring up the GPS settings                Intent intent = new Intent(                        android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);                startActivity(intent);            }            public void onLocationChanged(Location location) {                // Once a location has been received, ignore all other position                // updates.                locationManager.removeUpdates(locationListener);                locationManager.removeUpdates(this);                // Make sure that the received location is a valid one,                // otherwise show a warning toast and hit "back".                if (location == null) {                    String warningString = "Location was unititialized!";                    if (isDebug) {                        Toast.makeText(getApplicationContext(),                                warningString,                                Toast.LENGTH_LONG).show();                    }                    KeyEvent kev = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK);                    onKeyDown(KeyEvent.KEYCODE_BACK, kev);                }                CurrentLogEntry.getInstance().setUserLatitude(location.getLatitude());                CurrentLogEntry.getInstance().setUserLongitude(location.getLongitude());                //Send update to the main thread                int result = 0;                if (location.getLatitude() == 0 || location.getLongitude() == 0) {                    result = -1;                }                messageHandler.sendMessage(Message.obtain(messageHandler, result));            }        };        @Override        public void run() {            locationManager.requestLocationUpdates(                    LocationManager.GPS_PROVIDER, 0, 0, locationListener);            // Wait until a position has bee acquired.            while(!CurrentLogEntry.getInstance().isReadyToCalculate()){                try {                    wait(250);                } catch (InterruptedException ex) {                    Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);                }            }        }    };    t.start();}
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