我提供了下面的代码。相应地执行。

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

class MapPage extends StatefulWidget {
  const MapPage({Key? key}) : super(key: key);

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

class _MapPageState extends State<MapPage> {
  MapboxMapController? _mapController;
  final String accessToken =
      'MAPBOX_ACCESS_TOKEN'; // add your token key
  final LatLng initialCameraPosition = LatLng(37.7749, -122.4194); 
  final List<LatLng> vehiclePositions = [
    LatLng(37.7749, -122.4194),
    LatLng(37.7849, -122.4194),
    LatLng(37.7949, -122.4194),
    LatLng(37.8049, -122.4194),
    LatLng(37.8149, -122.4194),
  ];

  void _onMapCreated(MapboxMapController controller) {
    _mapController = controller;
  }

  void _addVehiclePositions(List<LatLng> positions) {
    String sourceId = 'vehiclePositions';
    String layerId = 'vehiclePositions';
    GeoJsonSource source = GeoJsonSource(sourceId, data: {
      'type': 'FeatureCollection',
      'features': positions.map((position) {
        return {
          'type': 'Feature',
          'geometry': {
            'type': 'Point',
            'coordinates': [position.longitude, position.latitude]
          }
        };
      }).toList()
    });
    CircleLayer circleLayer = CircleLayer(layerId, sourceId);
    circleLayer.circleColor = "#007cbf";
    circleLayer.circleRadius = 5;
    _mapController?.addSource(sourceId, source);
    _mapController?.addLayer(circleLayer);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Map Page'),
      ),
      body: MapboxMap(
        accessToken: accessToken,
        onMapCreated: _onMapCreated,
        initialCameraPosition: CameraPosition(
          target: initialCameraPosition,
          zoom: 12,
        ),
        styleString: MapboxStyles.MAPBOX_STREETS,
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          _addVehiclePositions(vehiclePositions);
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}

如果你遇到任何问题，请告诉我。