如何在Google Maps Flutter插件上添加折线？

如何在Google Maps Flutter插件上添加折线？

使用此插件 google_maps_flutter 解决了相同的问题 ：^ 0.5.19

import 'package:google_maps_flutter/google_maps_flutter.dart';static const LatLng _center = const LatLng(33.738045, 73.084488);final Set<Marker> _markers = {};final Set<Polyline>_polyline={};//add your lat and lng where you wants to draw polylineLatLng _lastMapPosition = _center;List<LatLng> latlng = List();LatLng _new = LatLng(33.738045, 73.084488);LatLng _news = LatLng(33.567997728, 72.635997456);latlng.add(_new);latlng.add(_news);//call this method on button click that will draw a polyline and markersvoid _onAddMarkerButtonPressed() {    getDistanceTime();    setState(() {        _markers.add(Marker( // This marker id can be anything that uniquely identifies each marker. markerId: MarkerId(_lastMapPosition.toString()), //_lastMapPosition is any coordinate which should be your default  //position when map opens up position: _lastMapPosition, infoWindow: InfoWindow(     title: 'Really cool place',     snippet: '5 Star Rating', ), icon: BitmapDescriptor.defaultMarker,        ));        _polyline.add(Polyline( polylineId: PolylineId(_lastMapPosition.toString()), visible: true, //latlng is List<LatLng> points: latlng, color: Colors.blue,        ));    });    //in your build widget method    GoogleMap(    //that needs a list<Polyline>        polylines:_polyline,        markers: _markers,        onMapCreated: _onMapCreated,        myLocationEnabled:true,        onCameraMove: _onCameraMove,        initialCameraPosition: CameraPosition( target: _center, zoom: 11.0,        ),        mapType: MapType.normal,    );}