How to add marker on google maps android?

user_6752483 0
Viewed 66721

I am a beginner in Android programming. I already looked at similar questions and answers but I still can't figure out why this doesn't work. When I try this on the emulator and click a location, no marker appears. This is my code:

Edit: I get a marker when I click now with the following code. It only gives me a runtime exception (NullPointer exception) when I click the map the second time:

public class MapViewFragment extends Fragment {

    MapView mMapView;
    private GoogleMap googleMap;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_map_view, container, false);
        mMapView = (MapView) rootView.findViewById(R.id.mapView);
        mMapView.onCreate(savedInstanceState);
        mMapView.onResume();

        Context context = getActivity().getApplicationContext();

        final LocationsDB locationsDB = new LocationsDB(context);

        try {
            MapsInitializer.initialize(getActivity().getApplicationContext());
        } catch (Exception e) {
            e.printStackTrace();
        }

        mMapView.getMapAsync(new OnMapReadyCallback() {
            @Override
            public void onMapReady(GoogleMap mMap) {
                googleMap = mMap;
                googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
                    public void onMapClick(LatLng point) {
                        // Drawing marker on the map
                        MarkerOptions markerOptions = new MarkerOptions();
                        markerOptions.position(point);
                        markerOptions.title(point.latitude + " : " + point.longitude);
                        googleMap.clear();
                        googleMap.animateCamera(CameraUpdateFactory.newLatLng(point));
                        googleMap.addMarker(markerOptions);
                        // Create location object
                        Location location = new Location(point.latitude, point.longitude);
                        // add location to SQLite database
                        locationsDB.insert(location);
                    }
                });
            }
        });
        return rootView;
    }
}

Log messages:

7-20 07:33:00.076 5359-5359/? W/RcsService: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.rcs.service.service.a.a()' on a null object reference
     at com.google.android.rcs.service.e.b(SourceFile:43)
     at com.google.android.rcs.service.service.JibeService.onDestroy(SourceFile:162)
     at android.app.ActivityThread.handleStopService(ActivityThread.java:3569)
     at android.app.ActivityThread.-wrap26(Unknown Source:0)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1703)
     at android.os.Handler.dispatchMessage(Handler.java:105)
     at android.os.Looper.loop(Looper.java:164)
     at android.app.ActivityThread.main(ActivityThread.java:6540)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)


07-20 07:33:00.079 5359-5359/? E/ActivityThread: Service com.google.android.rcs.service.service.JibeService has leaked IntentReceiver com.google.android.rcs.service.provisioning.RcsReconfigurationSmsReceiver@741339 that was originally registered here. Are you missing a call to unregisterReceiver()?
   android.app.IntentReceiverLeaked: Service com.google.android.rcs.service.service.JibeService has leaked IntentReceiver com.google.android.rcs.service.provisioning.RcsReconfigurationSmsReceiver@741339 that was originally registered here. Are you missing a call to unregisterReceiver()?
     at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:1310)
     at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:1091)
     at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1397)
     at android.app.ContextImpl.registerReceiver(ContextImpl.java:1370)
     at android.app.ContextImpl.registerReceiver(ContextImpl.java:1358)
     at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:603)
     at com.google.android.rcs.service.provisioning.RcsSmsReceiver.a(SourceFile:12)
     at com.google.android.rcs.service.h.g(SourceFile:230)
     at com.google.android.rcs.service.h.<init>(SourceFile:212)
     at com.google.android.rcs.service.service.a.<init>(SourceFile:13)
     at com.google.android.rcs.service.e.a(SourceFile:32)
     at com.google.android.rcs.service.service.JibeService.d(SourceFile:145)
     at com.google.android.rcs.service.service.JibeService.onCreate(SourceFile:91)
     at android.app.ActivityThread.handleCreateService(ActivityThread.java:3404)
     at android.app.ActivityThread.-wrap4(Unknown Source:0)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1683)
     at android.os.Handler.dispatchMessage(Handler.java:105)
     at android.os.Looper.loop(Looper.java:164)
     at android.app.ActivityThread.main(ActivityThread.java:6540)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
google-maps android
5 Answers

This code in MapsActivity works for me :

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback, GoogleMap.OnMapLongClickListener {

private GoogleMap mMap;
LocationManager locationManager;
LocationListener locationListener;

public void centreMapOnLocation(Location location, String title){

    LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
    mMap.clear();
    mMap.addMarker(new MarkerOptions().position(userLocation).title(title));
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(userLocation,12));

}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);

            Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            centreMapOnLocation(lastKnownLocation,"Your Location");
        }
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps2);
    // 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);
}



@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    mMap.setOnMapLongClickListener(this);

    Intent intent = getIntent();
    if (intent.getIntExtra("Place Number",0) == 0 ){

        // Zoom into users location
        locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                centreMapOnLocation(location,"Your Location");
            }

            @Override
            public void onStatusChanged(String s, int i, Bundle bundle) {

            }

            @Override
            public void onProviderEnabled(String s) {

            }

            @Override
            public void onProviderDisabled(String s) {

            }
        };

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,locationListener);
                Location lastKnownLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                centreMapOnLocation(lastKnownLocation,"Your Location");
        } else {

            ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},1);
        }
    } else {

        Location placeLocation = new Location(LocationManager.GPS_PROVIDER);
        placeLocation.setLatitude(MainActivity.location.get(intent.getIntExtra("Place Number",0)).latitude);
        placeLocation.setLongitude(MainActivity.location.get(intent.getIntExtra("Place Number",0)).longitude);

        centreMapOnLocation(placeLocation,MainActivity.places.get(intent.getIntExtra("Place Number",0)));
    }


}


@Override
public void onMapLongClick(LatLng latLng) {
    Geocoder geocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
    String adress ="";
    try {
        List<Address> listaddress = geocoder.getFromLocation(latLng.latitude,latLng.longitude,1);

        if (listaddress != null && listaddress.size()>0){
            if (listaddress.get(0).getThoroughfare() != null){

                if (listaddress.get(0).getSubThoroughfare() != null){
                    adress += listaddress.get(0).getSubThoroughfare() + "";

                }
                adress += listaddress.get(0).getThoroughfare();
            }

        }

    }catch (Exception e){
        e.printStackTrace();
    }

    mMap.addMarker(new MarkerOptions().position(latLng).title(adress));

    MainActivity.places.add(adress);
    MainActivity.location.add(latLng);
    MainActivity.arrayAdapter.notifyDataSetChanged();

    Toast.makeText(this, "Location Saved..!", Toast.LENGTH_SHORT).show();

}

}

user_83261450
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