Android, how to change activity field from LocationListener.onlocationchanged()?

How do I change an activity field from LocationListener.onlocationchanged() ? I suppose I have to use a handler, but don't know how to do it, exactly... My code is like this:

public class Main extends Activity {
    private Double lat, lon;
    private LocationManager locationManager;

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

        locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        LocationListener locationListenerGps = new CurrentLocationGps();
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0开发者_开发问答, 0, locationListenerGps);
    }
}

public class CurrentLocationGps implements LocationListener {
    @Override
    public void onLocationChanged(Location loc) {
        lat = loc.getLatitude();
        lon = loc.getLongitude();
>>>>>>>>---<<<<<<<<< How do I pass this values to Main activity fields?
    }
}

}

Place the CurrentLocationGps class inside the Main class (making it an inner class), this way you can access all the fields in Main activity.