利用Flutter在Google Map中实现折线点的多标记

dependencies:
  flutter:
    sdk: flutter
  google_maps_flutter: ^2.0.10

import 'package:google_maps_flutter/google_maps_flutter.dart';

GoogleMapController? _controller;
Set<Marker> _markers = {};

GoogleMap(
  initialCameraPosition: CameraPosition(
    target: LatLng(37.4219999, -122.0840575),
    zoom: 10,
  ),
  onMapCreated: (GoogleMapController controller) {
    _controller = controller;
  },
  markers: _markers,
)

void _onMapCreated(GoogleMapController controller) {
  _controller = controller;
  _markers.add(
    Marker(
      markerId: MarkerId('marker1'),
      position: LatLng(37.4219999, -122.0840575),
      infoWindow: InfoWindow(
        title: 'Marker 1',
        snippet: 'This is marker 1',
      ),
    ),
  );
  _markers.add(
    Marker(
      markerId: MarkerId('marker2'),
      position: LatLng(37.4329999, -122.0740575),
      infoWindow: InfoWindow(
        title: 'Marker 2',
        snippet: 'This is marker 2',
      ),
    ),
  );
  setState(() {});
}

void _addMarker(LatLng position, String title, String snippet) {
  _markers.add(
    Marker(
      markerId: MarkerId(position.toString()),
      position: position,
      infoWindow: InfoWindow(
        title: title,
        snippet: snippet,
      ),
    ),
  );
  setState(() {});
}

_addMarker(
  LatLng(37.4429999, -122.0640575),
  'Marker 3',
  'This is marker 3',
);