Android - ทำไมมันหาจุด current point ไม่เจอครับ ช่วยดูให้หน่อย

	SupportMapFragment supportMapFragment = ((SupportMapFragment) getSupportFragmentManager()
				.findFragmentById(R.id.mapView));
		googleMap = supportMapFragment.getMap();
		googleMap.getUiSettings().setZoomControlsEnabled(false);
		// googleMap.setMyLocationEnabled(true);
		locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
		Criteria cri = new Criteria();
		cri.setAccuracy(Criteria.ACCURACY_FINE);
		cri.setAltitudeRequired(false);
		cri.setBearingRequired(false);
		cri.setCostAllowed(true);
		cri.setPowerRequirement(Criteria.POWER_LOW);
		String provider = locationManager.getBestProvider(cri, true);
		location = locationManager.getLastKnownLocation(provider);
		locationManager.requestLocationUpdates(provider, 0, 0, this);

	@Override
	public void onLocationChanged(Location location) {
		if (location != null) {
			
			myLatitude = location.getLatitude();
			myLongitude = location.getLongitude();
			locationManager.removeUpdates(this);

		}
	}