tablet-app/lib/Screens/Map/google_map_view.dart

import 'dart:async';
import 'dart:typed_data';
import 'package:enum_to_string/enum_to_string.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:managerapi/api.dart';
import 'package:provider/provider.dart';
import 'package:tablet_app/Models/map-marker.dart';
import 'package:tablet_app/Screens/Map/map_context.dart';

class GoogleMapView extends StatefulWidget {
  final MapDTO mapDTO;
  final Uint8List selectedMarkerIcon;
  final String language;
  const GoogleMapView({
    Key key,
    this.mapDTO,
    this.selectedMarkerIcon,
    this.language,
  }) : super(key: key);

  @override
  _GoogleMapViewState createState() => _GoogleMapViewState();
}

class _GoogleMapViewState extends State<GoogleMapView> {
  ConfigurationDTO configurationDTO;
  Completer<GoogleMapController> _controller = Completer();
  Set<Marker> markers = {};
  List<MapMarker> markersList = List();

  Set<Marker> getMarkers(language, mapContext) {
    markers = {};

    widget.mapDTO.points.forEach((point) {
      var mapMarker = new MapMarker(
          id: point.id,
          title: point.title.firstWhere((translation) => translation.language == language).value,
          description: point.description.firstWhere((translation) => translation.language == language).value,
          longitude: point.longitude,
          latitude: point.latitude,
          images: point.images
      );
      markersList.add(mapMarker);
    });

    markersList.forEach((element) {
      if (element.latitude != null && element.longitude != null) {
        markers.add(Marker(
            draggable: false,
            markerId: MarkerId(element.latitude + element.longitude),
            position: LatLng(
              double.tryParse(element.latitude),
              double.tryParse(element.longitude),
            ),
            icon: BitmapDescriptor.fromBytes(widget.selectedMarkerIcon),
            /*icon: BitmapDescriptor.defaultMarkerWithHue(
              BitmapDescriptor.hueYellow,
            ),*/
            onTap: () {
              //setState(() {
                mapContext.setSelectedMarker(
                    new MapMarker(
                        title: element.title,
                        images: element.images,
                        description: element.description,
                        longitude: element.longitude,
                        latitude: element.latitude,
                    ));
              //});
            },
            infoWindow: InfoWindow(title: element.title)));
      }
    });

    return markers;
  }

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final mapContext = Provider.of<MapContext>(context);
    Size size = MediaQuery.of(context).size;

    return GoogleMap(
      mapType: widget.mapDTO.mapType != null ? EnumToString.fromString(MapType.values, widget.mapDTO.mapType.toString()): MapType.hybrid,
      mapToolbarEnabled: false,
      initialCameraPosition: CameraPosition(
        target: LatLng(50.416639, 4.879169),
        zoom: widget.mapDTO.zoom != null ? widget.mapDTO.zoom.toDouble() : 18,
      ),
      onMapCreated: (GoogleMapController controller) {
        _controller.complete(controller);
      },
      markers: getMarkers(widget.language, mapContext),
      onTap: (LatLng location) {
        //setState(() {
                        print(location);
                        mapContext.setSelectedMarker(
                            new MapMarker(
                                title: '',
                                description: '',
                                images: null,
                                longitude: null,
                                latitude: null
                            ));
             //         });
      },
    );
  }

}