Flutter：尝试移动地图时，该地图有错误

Question

我目前正在学习Flutter，并尝试添加Google地图。当我开始左右移动卡时，它有故障但可以移动。如果上下移动卡，则根本不会移动。所有文件都正确连接（pubspec jpl，android清单xml）

import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:location/location.dart' as LocationManager;

class GoogleMapScreen extends StatefulWidget {
  @override
  GoogleMapScreenState createState() => GoogleMapScreenState();
}

class GoogleMapScreenState extends State<GoogleMapScreen> {
  GoogleMapController mapController;


  void refresh() async {
    final center = await getUserLocation();
    mapController.addMarker(
      MarkerOptions(),);
    mapController.animateCamera(CameraUpdate.newCameraPosition(CameraPosition(
        target: center == null ? LatLng(0, 0) : center, zoom: 8.0)));
  }

  Future<LatLng> getUserLocation() async {
    var currentLocation = <String, double>{};
    final location = LocationManager.Location();
    try {
      currentLocation = await location.getLocation();
      final lat = currentLocation["latitude"];
      final lng = currentLocation["longitude"];
      final center = LatLng(lat, lng);
      return center;
    } on Exception {
      currentLocation = null;
      return null;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Map'),
        backgroundColor: Colors.green[700],
      ),
      body: SingleChildScrollView(
        child: Column(children: <Widget>[
          Container(
            height: MediaQuery.of(context).size.height,
            width: MediaQuery.of(context).size.width,
            child: GoogleMap(
              onMapCreated: (GoogleMapController controller) {
                mapController = controller;
                refresh();
                mapController.addMarker(
                  MarkerOptions(
                    position: LatLng(49.980719, 36.261454),
                    infoWindowText: InfoWindowText('Our Office', ''),
                  ),
                );
              },
              options: GoogleMapOptions(
                mapType: MapType.normal,
                scrollGesturesEnabled: false,
                tiltGesturesEnabled: true,
                rotateGesturesEnabled: true,
                myLocationEnabled: true,
                compassEnabled: true,
                cameraPosition: CameraPosition(
                  target: LatLng(49.98081, 36.25272),
                  zoom: 25.1,
                ),
              ),
            ),
          )
        ]),
      ),
    );
  }
}