CODEWITHSUNDEEP
flutter
coolhack7
coolhack7

Reputation: 1234

How to assign a list of latitude and longitude to a list of type Marker in Flutter

I have a list of type Map<String, dynamic> named positionMarkers which holds latitudes and longitudes along with their ID's that I would like to map accordingly into a list of type Marker i.e List<Marker>. I need the id in positionMarkers and the lat and lng to go into MarkerId() and LatLng() respectively. I'm pretty sure that this can be achieved by using loops but cannot seem to figure how. Any help would be appreciated:

import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';

class MapMarkers with ChangeNotifier {
  List<Map<String, dynamic>> positionMarkers = [
    {
      'id': 1,
      'lat': 22.6434340,
      'lng': 88.446740,
    },
    {
      'id': 2,
      'lat': 22.6435442,
      'lng': 88.456742,
    },
    {
      'id': 3,
      'lat': 22.6436544,
      'lng': 88.466744,
    },
    {
      'id': 4,
      'lat': 22.6437646,
      'lng': 88.476746,
    },
    {'id': 5, 'lat': 22.6438748, 'lng': 88.486748}
  ];

  final List<Marker> markers = [
    Marker(
      markerId: MarkerId(),
      position: LatLng(),
      infoWindow: InfoWindow(),
    )
  ];
}

Upvotes: 0

Views: 107

Answers (2)

MendelG
MendelG

Reputation: 20098

Is this what you want?

final List<Marker> markers = [];

void _createMarkers() {
  for (int i = 0; i < positionMarkers.length; i++) {
    markers.add(
      Marker(
        markerId: MarkerId(positionMarkers[i]['id']),
        position: LatLng(positionMarkers[i]['lat'], positionMarkers[i]['lng']),
        infoWindow: InfoWindow(
          title: 'Marker ${positionMarkers[i]['id']}',
        ),
      ),
    );
  }
}

Upvotes: 1

rrttrr
rrttrr

Reputation: 1856

Try this,

    final List<Marker> markers = List.empty(growable: true);
    for (var i in positionMarkers) {
      // markerId is i["id]
      // lat is i["lat"]
      // lng is i["lng"]
      markers.add(
        Marker(
          markerId: MarkerId(i["id"]),
          position: LatLng(i["lat"], i["lng"]),
          infoWindow: InfoWindow(),
        ),
      );
    }

Upvotes: 1

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