location_context 是一个用于在 Flutter 应用中管理位置上下文的插件。它可以帮助你获取设备的地理位置信息，并在应用的不同部分共享这些信息。以下是如何使用 location_context 插件的基本步骤：

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 location_context 插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  location_context: ^1.0.0  # 请使用最新版本

然后运行 flutter pub get 来获取依赖。

2. 初始化 LocationContext

在你的应用的 main.dart 文件中，初始化 LocationContext：

import 'package:flutter/material.dart';
import 'package:location_context/location_context.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await LocationContext.initialize();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Location Context Demo',
      home: HomeScreen(),
    );
  }
}

3. 获取位置信息

在需要使用位置信息的地方，你可以通过 LocationContext 获取当前位置：

import 'package:flutter/material.dart';
import 'package:location_context/location_context.dart';

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Location Context Demo'),
      ),
      body: Center(
        child: FutureBuilder<LocationData>(
          future: LocationContext.getLocation(),
          builder: (context, snapshot) {
            if (snapshot.connectionState == ConnectionState.waiting) {
              return CircularProgressIndicator();
            } else if (snapshot.hasError) {
              return Text('Error: ${snapshot.error}');
            } else if (snapshot.hasData) {
              LocationData location = snapshot.data!;
              return Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('Latitude: ${location.latitude}'),
                  Text('Longitude: ${location.longitude}'),
                  Text('Accuracy: ${location.accuracy}'),
                  Text('Altitude: ${location.altitude}'),
                ],
              );
            } else {
              return Text('No location data available');
            }
          },
        ),
      ),
    );
  }
}

4. 监听位置变化

你还可以监听位置的变化，并在位置更新时执行某些操作：

import 'package:flutter/material.dart';
import 'package:location_context/location_context.dart';

class LocationListenerScreen extends StatefulWidget {
  @override
  _LocationListenerScreenState createState() => _LocationListenerScreenState();
}

class _LocationListenerScreenState extends State<LocationListenerScreen> {
  LocationData? _currentLocation;

  @override
  void initState() {
    super.initState();
    LocationContext.onLocationChanged.listen((location) {
      setState(() {
        _currentLocation = location;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Location Listener'),
      ),
      body: Center(
        child: _currentLocation == null
            ? Text('Waiting for location...')
            : Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('Latitude: ${_currentLocation!.latitude}'),
                  Text('Longitude: ${_currentLocation!.longitude}'),
                  Text('Accuracy: ${_currentLocation!.accuracy}'),
                  Text('Altitude: ${_currentLocation!.altitude}'),
                ],
              ),
      ),
    );
  }
}

5. 处理权限

在 Android 和 iOS 上，获取位置信息需要相应的权限。你需要在 AndroidManifest.xml 和 Info.plist 中添加相应的权限声明。

AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

Info.plist:

<key>NSLocationWhenInUseUsageDescription</key>
<string>We need your location to provide better services.</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>We need your location to provide better services.</string>

6. 处理错误

在使用 LocationContext 时，可能会遇到权限被拒绝或位置服务不可用的情况。你需要处理这些错误，并向用户提供适当的反馈。

Future<void> getLocation() async {
  try {
    LocationData location = await LocationContext.getLocation();
    print('Location: $location');
  } on LocationServiceDisabledException {
    print('Location services are disabled.');
  } on PermissionDeniedException {
    print('Location permissions are denied.');
  } catch (e) {
    print('Error: $e');
  }
}