android - Flutter如何在圆圈中显示标记？ flutter_map

Question

Flutter 新手。如何在 flutter_map 的圆圈中显示标记。哪一天已经在尝试解决这个问题。我不能改变半径中的标记，或者只是改变颜色。这就是我所取得的成就:

Position _currentPosition;
  static final List<LatLng> _points = [
    LatLng(55.749122, 37.659750),
    LatLng(55.770854, 37.626963),
    LatLng(55.776937, 37.637949),
    LatLng(55.739266, 37.637434),
  ];

  static const _markerSize = 40.0;
  List<Marker> _markers;
  List<CircleMarker> circle;

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

    _markers = _points
        .map(
          (LatLng point) => Marker(
        point: point,
        width: _markerSize,
        height: _markerSize,
        builder: (_) => Icon(Icons.location_on, size: _markerSize),
      ),
    ).toList();

    _getCurrentLocation();
  }

  _getCurrentLocation() {
    geolocator
        .getCurrentPosition(desiredAccuracy: LocationAccuracy.best)
        .then((Position position) {
      setState(() {
        _currentPosition = position;
      });

    }).catchError((e) {
      print(e);
    });
  }

  @override
  Widget build(BuildContext context) {
    return FlutterMap(
      options: new MapOptions(
          minZoom: 16.0,
          center:  new LatLng(_currentPosition.latitude,_currentPosition.longitude)),
      layers: [new TileLayerOptions(urlTemplate: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
          subdomains: ['a','b','c']),
        new MarkerLayerOptions(
            markers: [
              new Marker(
                  width: 45.0,
                  height: 45.0,
                  point: new LatLng(_currentPosition.latitude,_currentPosition.longitude),
                  builder: (context)=>new Container(
                    child: IconButton(icon: Icon(Icons.accessibility), onPressed: () {print('Marker tapped!');}),
                  ))]),
      MarkerLayerOptions(markers: _markers),
      CircleLayerOptions(circles: [ CircleMarker(
          point: LatLng(_currentPosition.latitude,_currentPosition.longitude),
          color: Colors.blue.withOpacity(0.7),
          borderStrokeWidth: 2,
          useRadiusInMeter: true,
          radius: 2000 // 2000 meters | 2 km
      )]),
    ],
    );
  }

my result - (this is image)
如何更改蓝色圆圈中的标记。例如更改标记图标？

Answer 1

您是否尝试过更改标记的构建器，例如:

_markers = _points
    .map(
      (LatLng point) => Marker(
    point: point,
    width: _markerSize,
    height: _markerSize,
    builder: (_) => Icon(
       Icons.location_city,
       size: _markerSize,
       color: Colors.red,
    ),
  ),
).toList();