Define coordinates when opening map

To open Google Maps directly from your application with a given coordinate, using Intent same, for example.

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:-19.8516098,-43.9509601?z=15"));
startActivity(intent);

Other examples, you can see here in the documentation . In my example, in addition to latitude and longitude, I also set zoom .

In your core activity, implement the LocationListener interface and copy the code below into your main activity.

public class BasicMapActivity_new extends Activity implements LocationListener {
        private LocationManager locationManager;
        private String provider;

        LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
        boolean enabledGPS = service
        .isProviderEnabled(LocationManager.GPS_PROVIDER);
        boolean enabledWiFi = service
        .isProviderEnabled(LocationManager.NETWORK_PROVIDER);
        if (!enabledGPS) {
            Toast.makeText(BasicMapActivity_new.this, "GPS signal not found", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(intent);
        }
        else if(!enabledWiFi){
            Toast.makeText(BasicMapActivity_new.this, "Network signal not found", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(intent);
        }

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        // Define the criteria how to select the locatioin provider -> use
        // default
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        Location location = locationManager.getLastKnownLocation(provider);
        //getCurrentLocation();

        // Initialize the location fields
        if (location != null) {
            // Toast.makeText(BasicMapActivity_new.this, "Selected Provider " + provider,
            //Toast.LENGTH_SHORT).show();
            onLocationChanged(location);
        } else {

            //do something
        }
        initilizeMap();
    }

Next, in the implementation of the methods of this interface do the following:

   @Override
    public void onLocationChanged(Location location) {

        double lat =  location.getLatitude();
        double lng = location.getLongitude();

        LatLng coordinate = new LatLng(lat, lng);

        startPerc = mMap.addMarker(new MarkerOptions()
        .position(coordinate)
        .title("Current Location")
        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE)));  

        mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 18.0f));
    }

    @Override
    protected void onPause() {
        super.onPause();
        locationManager.removeUpdates(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
        initilizeMap();
    }

Finally grant the required permissions to the maninfest file:

  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

Every Marker, you have to enter via JS.

As you already have the position, just send to javascript and pick up a variable.

Or set straight as in this example of W3Schools.

W3Schools

This link below is the official google maps documentation.

Google Maps

just call         CameraUpdateFactory.newLatLng (LatLng) when loading the map, or where it is needed. Construct a LatLng object that has the point x and y ready.