我尝试获取设备当前位置并在initialCameraPosition中使用，
执行函数，获取坐标并将其设置在**_currentPosition**中
启动屏幕后，我有一个错误：

• 最新错误（最新初始化错误：字段"currentPosition"尚未初始化。）*

我认为，Map创建速度比数据写入变量的速度快，但我不知道它是如何修复的。
感谢帮助或建议如何使代码是正确的

import 'package:flutter/material.dart';

import 'package:google_maps_flutter/google_maps_flutter.dart';

import 'package:geolocator/geolocator.dart';

class UserMapInfo extends StatefulWidget {
  const UserMapInfo({Key? key}) : super(key: key);

  @override
  State<UserMapInfo> createState() => _UserMapInfoState();
}

class _UserMapInfoState extends State<UserMapInfo> {
  late GoogleMapController mapController;

  late LatLng _currentPosition;

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

  getLocation() async {
    LocationPermission permission;
    permission = await Geolocator.requestPermission();

    Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    double lat = position.latitude;
    double long = position.longitude;

    LatLng location = LatLng(lat, long);

    setState(() {
      _currentPosition = location;
    });
  }

  void _onMapCreated(GoogleMapController controller) {
    mapController = controller;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Map'),
      ),
      body: GoogleMap(
        onMapCreated: _onMapCreated,
        initialCameraPosition: CameraPosition(
          target: _currentPosition,
          zoom: 16.0,
        ),
      ),
    );
  }
}

• • 更新**

我试着用

• • LatLng？_当前位置;**

并添加测试坐标

• • 横向长度基准位置=横向长度（56.324293441187315，38.13961947281509）;**

并添加"空值检查"
我的代码

class _UserMapInfoState extends State<UserMapInfo> {
  
  late GoogleMapController mapController;

  // late LatLng currentPosition;

  LatLng? _currentPosition;

  LatLng basePosition = LatLng(56.324293441187315, 38.13961947281509);

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

  getLocation() async {
    LocationPermission permission;
    permission = await Geolocator.requestPermission();

    Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    double lat = position.latitude;
    double long = position.longitude;

    LatLng location = LatLng(lat, long);

    setState(() {
      _currentPosition = location;
    });
  }

  void _onMapCreated(GoogleMapController controller) {
    mapController = controller;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Map'),
      ),
      body: GoogleMap(
        onMapCreated: _onMapCreated,
        initialCameraPosition: CameraPosition(
          target: _currentPosition ?? basePosition,
          zoom: 16.0,
        ),
      ),
    );
  }
}

当我的Map打开时，使用LatLng basePosition（（这不是我需要的
我尝试其他空检查

initialCameraPosition: CameraPosition(
          target: _currentPosition!,
          zoom: 16.0,
        ),

再次出错

• _CastError（用于空值的空检查运算符）*

谢谢!好办法!
我在这里加上"null check"
终码

import 'package:flutter/material.dart';

import 'package:google_maps_flutter/google_maps_flutter.dart';

import 'package:geolocator/geolocator.dart';

class UserMapInfo extends StatefulWidget {
  const UserMapInfo({Key? key}) : super(key: key);

  @override
  State<UserMapInfo> createState() => _UserMapInfoState();
}

class _UserMapInfoState extends State<UserMapInfo> {
  late GoogleMapController mapController;

  LatLng? _currentPosition;

  bool _isLoading = true;

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

  getLocation() async {
    LocationPermission permission;
    permission = await Geolocator.requestPermission();

    Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    double lat = position.latitude;
    double long = position.longitude;

    LatLng location = LatLng(lat, long);

    setState(() {
      _currentPosition = location;
      _isLoading = false;
    });
  }

  void _onMapCreated(GoogleMapController controller) {
    mapController = controller;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Map'),
      ),
      body: _isLoading
          ? const Center(
              child: CircularProgressIndicator(),
            )
          : GoogleMap(
              onMapCreated: _onMapCreated,
              initialCameraPosition: CameraPosition(
                target: _currentPosition!,
                zoom: 16.0,
              ),
            ),
    );
  }
}