private void GetCompaniesByLocation(double latitude,double longitude)
    {
        string url = "http://127.0.0.1/testapi/handler.php/latlong/" + latitude + "/" + longitude;
        BitmapDescriptor icon = BitmapDescriptorFactory.FromResource(Resource.Drawable.here_icon);

        Companies[] onlines = CallRestServiceCompanies(url);
        int i = 0;
        foreach (Companies online in onlines)
        {
            if (i == 0) {
                locationPoint = new LatLng(online.address_lat, online.address_long);
                CameraUpdate camera = CameraUpdateFactory.NewLatLngZoom(locationPoint, 16);
                mMap.AnimateCamera(camera);
                i++;
            }
            LatLng latlng = new LatLng(online.address_lat, online.address_long);
            MarkerOptions options = new MarkerOptions();

            options.SetPosition(latlng);
            options.SetTitle(online.company_name);
            options.SetSnippet(online.company_website);
            options.SetIcon(icon);

            mMap.AddMarker(options);
        }
}

public void OnLocationChanged(Location location)
    {
        currentLocation = location;
        if(currentLocation != null)
        {
            GetCompaniesByLocation(currentLocation.Latitude, currentLocation.Longitude);
        }
    }