[SOLVED] Update googlemap Camera location every time location changes

Update googlemap Camera location every time location changes

I would like the camera to automatically update and move every time the location changes. Is this possible? I am using onMapReady() and onLocationChanged().

public class MainActivity extends AppCompatActivity implements LocationListener, OnMapReadyCallback {

OnCreate()

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


    locationManager = (LocationManager) (getSystemService(Context.LOCATION_SERVICE));


    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        //TODO: Consider calling
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PICK_FINE_LOCATION_REQUEST);
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PICK_COARSE_LOCATION_REQUEST);
        return;
    }


    locationCurrent = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    onLocationChanged(locationCurrent);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 5, this);

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

}

onMapReady()

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        //TODO: Consider calling
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PICK_FINE_LOCATION_REQUEST);
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PICK_COARSE_LOCATION_REQUEST);
        return;
    }
    LatLng latLng = new LatLng(locationCurrent.getLatitude(),locationCurrent.getLongitude());
    CameraPosition cameraPosition= new CameraPosition(latLng,15,0,0);
    CameraUpdate cameraUpdate = CameraUpdateFactory.newCameraPosition(cameraPosition);
    googleMap.animateCamera(cameraUpdate);
    googleMap.setMyLocationEnabled(true);
    googleMap.getUiSettings().setZoomControlsEnabled(true);
    map = googleMap;

I have a global variable: Googlemap map;

onLocationChanged()

@Override
public void onLocationChanged(Location location) {

    //Log.d("UPDATEMAP","onLocationChanged");
    UpdateMap(map,location);}

I made a method called UpdateMap()

    public void UpdateMap(GoogleMap map,Location location){
    Log.d("UPDATEMAP","UpdateMap");
    LatLng latLngUpdate = new LatLng(location.getLatitude(),location.getLongitude());
    CameraPosition cameraPosition = new CameraPosition(latLngUpdate,15,0,0);
    CameraUpdate cameraUpdate = CameraUpdateFactory.newCameraPosition(cameraPosition);
    map.animateCamera(cameraUpdate);
}

The error I am getting is that the global variable is equal to null even though I set it in onMapReady(). Any Help will be appreciated. Thanks Ritvik.

Solution

Your map variable is null because onLocationChanged is being called before onMapReady.
To fix it request location updates in the method onMapReady after the variable is assigned.