当然，以下是一个使用Flutter地理位置获取插件 latlong2 的示例代码。不过，需要指出的是，latlong2 插件本身主要用于处理地理位置数据（经纬度等），而不是直接用于获取地理位置。通常，你会结合如 geolocator 插件来获取地理位置，然后使用 latlong2 来处理这些数据。

首先，确保你的 pubspec.yaml 文件中包含以下依赖：

dependencies:
  flutter:
    sdk: flutter
  geolocator: ^9.0.2  # 最新版本号可能会有所不同，请查看pub.dev获取最新
  latlong2: ^0.8.1    # 最新版本号可能会有所不同，请查看pub.dev获取最新

然后运行 flutter pub get 来安装这些依赖。

接下来是示例代码，展示如何使用 geolocator 获取地理位置并使用 latlong2 来处理这些数据：

import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:geolocator/geolocation_status.dart';
import 'package:latlong2/latlong2.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  LatLng? _position;
  bool _serviceEnabled = false;
  LocationPermission _permission = LocationPermission.denied;
  GeolocationStatus? _locationStatus = GeolocationStatus.unknown;

  Future<void> _checkLocationPermission() async {
    _serviceEnabled = await Geolocator.isLocationServiceEnabled();
    if (!_serviceEnabled) {
      return Future.error('Location services are disabled.');
    }

    _permission = await Geolocator.checkPermission();
    if (_permission == LocationPermission.denied) {
      _permission = await Geolocator.requestPermission();
      if (_permission == LocationPermission.denied) {
        return Future.error('Location permissions are denied');
      }
    }

    if (_permission == LocationPermission.deniedForever) {
      return Future.error(
          'Location permissions are permanently denied, we cannot request permissions.');
    }

    _locationStatus = await Geolocator.checkGeolocationStatus(forceAndroidLocationManager: true);
    if (!_locationStatus!.isGranted) {
      return Future.error('Location access is denied');
    }
  }

  Future<void> _getCurrentLocation() async {
    bool serviceEnabled;
    LocationPermission permission;
    GeolocationStatus locationStatus;

    serviceEnabled = await Geolocator.isLocationServiceEnabled();
    if (!serviceEnabled) {
      return;
    }

    permission = await Geolocator.checkPermission();
    if (permission == LocationPermission.denied) {
      permission = await Geolocator.requestPermission();
      if (permission == LocationPermission.denied) {
        return;
      }
    }

    if (permission == LocationPermission.deniedForever) {
      return;
    }

    locationStatus = await Geolocator.checkGeolocationStatus(forceAndroidLocationManager: true);
    if (!locationStatus.isGranted) {
      return;
    }

    Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    setState(() {
      _position = LatLng(position.latitude!, position.longitude!);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Geolocation Example'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                _serviceEnabled ? 'Location services are enabled.' : 'Location services are disabled.',
              ),
              SizedBox(height: 10),
              Text(
                '$_permission',
              ),
              SizedBox(height: 10),
              if (_position == null)
                ElevatedButton(
                  onPressed: () async {
                    try {
                      await _checkLocationPermission();
                      await _getCurrentLocation();
                    } catch (e) {
                      print(e);
                    }
                  },
                  child: Text('Get Current Location'),
                )
              else
                Text(
                  'Latitude: ${_position!.latitude}, Longitude: ${_position!.longitude}',
                ),
            ],
          ),
        ),
      ),
    );
  }
}

这个示例代码做了以下几件事：

1. 检查位置服务是否启用。
2. 检查并请求位置权限。
3. 获取当前位置并将其转换为 LatLng 对象（来自 latlong2 插件）。
4. 显示当前位置的经纬度。

请确保在实际应用中处理权限请求失败的情况，并根据需要调整UI和用户体验。