get my current location in a variable and to create a marker on Google map activity using json data

[sonu gadewar]

I am developing an android app .In this app i want to get my location (latitude and longitude) and want to show nearby markers under certain radius. And my Questions are :-

Q1)How to retrieve or get my current location and the store it in variables (in terms of latitude and longitude) ? Suppose my co-ordinates are "2.3331 , 5.2223" , so how to get this in 2 variables ( lat and long).

Q2)How to create a marker on Google map activity using json values (json data is coming from remote database) ? I am having the data( latitude and longitude ) in json of 3 locations , now from that data how to create markers on google map ?

 

[IArdel]

Sonu,
below you can find the code you need:

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {

    //need this to get permission from user
    public static final String ACCESS_COARSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
    public static final String ACCESS_FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
    private static final int PERMISSION_REQUEST_CODE = 1234;

    private LocationManager locationManager;
    LatLng myGPSPosition, myNetworkPosition;

    [USER=1021285]@override[/USER]
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

        FragmentManager fragmentManager = this.getSupportFragmentManager();
        SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager
                .findFragmentById(map);

        supportMapFragment.getMapAsync(this);
    }

    [USER=1021285]@override[/USER]
    public void onMapReady(GoogleMap map) {
        if (ActivityCompat.checkSelfPermission(getApplicationContext(), ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(getApplicationContext(), ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions();
        } else {
            map.setMyLocationEnabled(true);
        }

        try {
            Location locationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            //here what you need:
            double latitude = locationGPS.getLatitude();
            double longitude = locationGPS.getLongitude();
            //create marker
            myGPSPosition = new LatLng(latitude, longitude);
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(myGPSPosition, 15));
            //add marker
            map.addMarker(new MarkerOptions()
                    .title("My GPS position")
                    .position(myGPSPosition));
        }catch (NullPointerException | IllegalArgumentException e){
            e.printStackTrace();
            Toast.makeText(this,"Unable to get GPS data",Toast.LENGTH_SHORT).show();
        }

        try {
            //the same, but using network proveder
        Location locationNetwork = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            double latitude = locationNetwork.getLatitude();
            double longitude = locationNetwork.getLongitude();
        myNetworkPosition = new LatLng(latitude, longitude);
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(myNetworkPosition, 15));
            map.addMarker(new MarkerOptions()
                    .title("My Network position")
                    .position(myNetworkPosition));
        }catch (NullPointerException | IllegalArgumentException e){
            e.printStackTrace();
            Toast.makeText(this,"Unable to get Network data",Toast.LENGTH_SHORT).show();
        }

    }

    public void requestPermissions() {
        ActivityCompat.requestPermissions(this,
                new String[]{
                        ACCESS_COARSE_LOCATION,
                        ACCESS_FINE_LOCATION
                },
                PERMISSION_REQUEST_CODE);
    }
}

 

[Unforgiven]

I moved this to the development area for better exposure.

 

[sonu gadewar]

Sonu,
below you can find the code you need:

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {

    //need this to get permission from user
    public static final String ACCESS_COARSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
    public static final String ACCESS_FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
    private static final int PERMISSION_REQUEST_CODE = 1234;

    private LocationManager locationManager;
    LatLng myGPSPosition, myNetworkPosition;

    [USER=1021285]@override[/USER]
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

        FragmentManager fragmentManager = this.getSupportFragmentManager();
        SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager
                .findFragmentById(map);

        supportMapFragment.getMapAsync(this);
    }

    [USER=1021285]@override[/USER]
    public void onMapReady(GoogleMap map) {
        if (ActivityCompat.checkSelfPermission(getApplicationContext(), ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(getApplicationContext(), ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            requestPermissions();
        } else {
            map.setMyLocationEnabled(true);
        }

        try {
            Location locationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            //here what you need:
            double latitude = locationGPS.getLatitude();
            double longitude = locationGPS.getLongitude();
            //create marker
            myGPSPosition = new LatLng(latitude, longitude);
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(myGPSPosition, 15));
            //add marker
            map.addMarker(new MarkerOptions()
                    .title("My GPS position")
                    .position(myGPSPosition));
        }catch (NullPointerException | IllegalArgumentException e){
            e.printStackTrace();
            Toast.makeText(this,"Unable to get GPS data",Toast.LENGTH_SHORT).show();
        }

        try {
            //the same, but using network proveder
        Location locationNetwork = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            double latitude = locationNetwork.getLatitude();
            double longitude = locationNetwork.getLongitude();
        myNetworkPosition = new LatLng(latitude, longitude);
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(myNetworkPosition, 15));
            map.addMarker(new MarkerOptions()
                    .title("My Network position")
                    .position(myNetworkPosition));
        }catch (NullPointerException | IllegalArgumentException e){
            e.printStackTrace();
            Toast.makeText(this,"Unable to get Network data",Toast.LENGTH_SHORT).show();
        }

    }

    public void requestPermissions() {
        ActivityCompat.requestPermissions(this,
                new String[]{
                        ACCESS_COARSE_LOCATION,
                        ACCESS_FINE_LOCATION
                },
                PERMISSION_REQUEST_CODE);
    }
}

thank you

 

[sonu gadewar]

I moved this to the development area for better exposure.

thank you

 

[Nedson Donato Soares]

There is a complete tutorial? I want to make a full project, where i can put a marker on the map when the accelerometer get the value i want.