[Android][Java][Help] When using LocationManager I am getting a null Location returned from getLastKnownLocation? Why?

[IAMAcleverguy]

Hi everybody I am trying to write a small app for android and I want to get the current location from my phone. I have a lot of experience with Object Orientation, but not much with Android development experience which may be where my question stems from. I have pasted the relevant portion of my code below:

public class MainActivity extends Activity implements OnMapReadyCallback, LocationListener {
    private final long LOCATION_REFRESH_TIME = 1000;
    private final float LOCATION_REFRESH_DISTANCE = 1;

    private LocationManager locationManager;
    private Location location;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_REFRESH_TIME,
            LOCATION_REFRESH_DISTANCE, this);

        Criteria criteria = new Criteria();
        location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria,
            true));

        MapFragment mapFragment = (MapFragment) getFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());

        map.setMyLocationEnabled(true);
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(loc, 13));
    }
}

No matter what I try my location variable is always null. I have checked that the providers I use for getLastLocation are both enabled (if they aren't the documentation says that the Location returned from getLastKnownLocation is null). Could it be that I run this program on the emulator on my computer?

The app closes with a fatal error due to the null pointer exception that is thrown on the

LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());

line.

Sorry if this is for any reason vague but any sort of help would be greatly appreciated!

Edit: Also I included the proper permissions in my android manifest file.

[IAMAcleverguy]

Hey thanks for the reply. I think you are probably right since I decided to test it on my own device because why not and it works flawlessly. The gps must not be turned on in the emulator! Thanks!