Flutter 当我点击标记时相机未居中

Question

我正在尝试使用谷歌地图创建一个 Flutter 应用程序，我在 map 中将一些地方作为标记呈现，但是，当我点击标记时，相机会移动到它但它没有居中（标记变为屏幕底部）。

这是 map 小部件代码：

import 'package:camping_global/models/map_marker.dart';
import 'package:camping_global/models/place.dart';
import 'package:camping_global/services/firestorage_service.dart';
import 'package:camping_global/services/firestore_service.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';

import '../locator.dart';

class GmapTest extends StatefulWidget {
  GmapTest({Key key, this.title}) : super(key: key);

  final String title;

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

class _GmapTestState extends State<GmapTest> {
  final FirebaseStorageService _firebaseStorage = locator<FirebaseStorageService>();
  final FirestoreService _firestoreService = locator<FirestoreService>();
  List<Marker> _markers = [
    Marker(
      markerId: MarkerId('0'),
      position: LatLng(36.7949999, 10.073237),
    ),
  ];
  GoogleMapController _controller;
  Map<String, MapMarker> _mediaPool = Map();
  Map<MarkerId, Marker> markerList = Map();
  List<Place> _placeList = List.empty();
  MapType _currentMapType = MapType.satellite;

  _parsedApiResponse() async {
    _placeList = await _firestoreService.getAllPlaces();
    Map<String, MapMarker> result = Map();
    for (int i = 0; i < _placeList.length; i++) {
      String iconUrl = await _firebaseStorage.getImageUrl(_placeList[i].iconId);
      List<String> latlong = _placeList[i].position.split(",");
      double latitude = double.parse(latlong[0]);
      double longitude = double.parse(latlong[1]);
      result.putIfAbsent(
          _placeList[i].id,
          () => MapMarker(
              markerId: _placeList[i].id,
              name: _placeList[i].title,
              place: _placeList[i],
              latitude: latitude,
              longitude: longitude,
              thumbnailSrc: iconUrl));
    }
    setState(() {
      _mediaPool = result;
    });
    await _getMarkers();
  }

  _getMarkers() async {
    if (_mediaPool == null || _mediaPool.length <= 0) return;
    BitmapDescriptor bitmapDescriptor = await BitmapDescriptor.fromAssetImage(ImageConfiguration(size: Size(24, 24)), 'assets/place_icon.png');
    for (MapMarker feature in _mediaPool.values) {
      var marker = Marker(
        markerId: MarkerId(feature.markerId),
        position: LatLng(feature.latitude, feature.longitude),
        icon: bitmapDescriptor,
      );
      markerList.putIfAbsent(MarkerId(feature.markerId), () => marker);
      setState(() {
        _markers = markerList.values.toList();
      });
    }
  }

  @override
  initState() {
    super.initState();
    _parsedApiResponse();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GoogleMap(
        onMapCreated: (GoogleMapController controller) {
          _controller = controller;
        },
        mapType: _currentMapType,
        initialCameraPosition: CameraPosition(
          target: LatLng(36.7949999, 10.073237),
          zoom: 5,
        ),
        markers: _markers.toSet(),
        myLocationEnabled: true,
        myLocationButtonEnabled: true,
      ),
    );
  }
}

Ps：我已经为测试添加了 _markers 初始化，当我点击它时它是居中的。 然而，来自 firebase 的标记是问题所在。

请指教！