LocationManager locationManager;
static LocationListener locationListener;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.myactivity);

    // Acquire a reference to the system Location Manager
    locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

    // Define a listener that responds to location updates
    locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {

            // Called when a new location is found by the network location provider.
            if ((location != null) && (location.getAccuracy()<25) ) {
                LoadTask loadtext = new LoadTask();
                loadtext.execute();
            }
        }
    };

    // Register the listener with the Location Manager to receive location updates
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER , 100, 1, locationListener);
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER , 100, 1, locationListener);
}

@Override
protected void onStop() {
    super.onStop();
    locationManager.removeUpdates(locationListener);
    locationManager = null;
}

...

private class LoadTask extends AsyncTask<Void, Void, Void> { ...