Display current location with Google Maps API - android-studio

Question

I am trying to display my current location on Google Maps using Google Maps API in Android Studio. The code below puts a marker in the wrong location (somewhere in Atlantic Ocean). What am I doing wrong and how can I solve this problem?
P.S. I ran the code on Pixel 2 and Nexus 5 API 28 virtual devices
Thanks in advance.
public class MapsActivity extends FragmentActivity implements
OnMapReadyCallback {
private GoogleMap mMap;
private double userLat, userLong;
private Location lastKnownLocation;
private LatLng userLocation;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
String locationProvider = LocationManager.GPS_PROVIDER;
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
userLat = lastKnownLocation.getLatitude();
userLong = lastKnownLocation.getLongitude();
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
userLocation = new LatLng (userLat, userLong);
mMap.addMarker(new MarkerOptions().position(userLocation).title("My Location"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(userLocation));
}
}

Answer 1

Try my code it works on me very well
public class mapTracking extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
boolean isGpsEnable = false;
boolean isNetworkEnable = false;
Location location;
LocationManager locationManager;
Context mcontext;
DatabaseHelper db = new DatabaseHelper(this);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map_tracking);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getApplicationContext(),
android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION,
android.Manifest.permission.ACCESS_COARSE_LOCATION}, 101);
}
mcontext = this;
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
isGpsEnable = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnable = locationManager.isProviderEnabled(NETWORK_PROVIDER);
if (isGpsEnable) {
if (location == null) {
if (ActivityCompat.checkSelfPermission(mapTracking.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 5, myLocationListener);
if (locationManager != null) {
locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
}
}
if (isNetworkEnable) {
if (location == null) {
locationManager.requestLocationUpdates(NETWORK_PROVIDER, 1000, 5, myLocationListener);
if (locationManager != null) {
locationManager.getLastKnownLocation(NETWORK_PROVIDER);
}
}
}
if (location != null) {
locationManager.requestLocationUpdates(NETWORK_PROVIDER, 1000, 5, myLocationListener);
if (locationManager != null) {
locationManager.getLastKnownLocation(NETWORK_PROVIDER);
}
}
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
try {
db.getWritableDatabase();
List<MyLocation>myLocationList = db.getAllMark();
if (myLocationList.size() == 0) {
Toast.makeText(this, "No Data Found", Toast.LENGTH_SHORT).show();
}
for (MyLocation l : myLocationList) {
LatLng latlng = new LatLng(l.getLatitude(), l.getLongitude());
mMap.addMarker(new MarkerOptions().position(latlng).snippet("Coordinates: " + l.getLatitude() + " " + l.getLongitude()));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latlng, 16.2f));
}
db.close();
} catch (NumberFormatException e){
e.printStackTrace();
Toast.makeText(this, "No data Found" , Toast.LENGTH_SHORT).show();
}
}
final LocationListener myLocationListener = new LocationListener() {
#Override
public void onLocationChanged(final Location location) {
final double lat = location.getLatitude();
final double lon = location.getLongitude();
db.insertMyLocation(lat,lon);
System.out.println("LOCATIONNNN::::::::::::::::::::::::::" + lat + "," + lon + "\n" + location.getProvider());
System.out.println(":::::::::::::::::::::::::::::::::::::::::::::::::"+db.getlocation().getCount());
final LatLng latLng = new LatLng(lat, lon);
Toast.makeText(mcontext, "" + latLng + "\n" + location.getProvider(), Toast.LENGTH_SHORT).show();
mMap.addMarker(new MarkerOptions().position(latLng).snippet("Coordinates: " + lat + " " + lon));
// mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 16.2f));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 20.2f));
mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
#Override
public boolean onMarkerClick(Marker marker) {
// Toast.makeText(mapTracking.this, ""+latLng, Toast.LENGTH_SHORT).show();
LatLng loc = marker.getPosition();
double lat1 = loc.latitude;
double lng1 = loc.longitude;
Geocoder geocoder = new Geocoder(mapTracking.this, Locale.getDefault());
try {
List<Address> addresses = geocoder.getFromLocation(lat1,lng1,1);
Address address = addresses.get(0);
System.out.println(":::::::::::::::::123" + address);
Toast.makeText(mapTracking.this, "Address:" + address.getAddressLine(0), Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
});
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
#Override
public void onProviderEnabled(String provider) {
}
#Override
public void onProviderDisabled(String provider) {
}
};
}