Flutter地理位置服务插件places_service的使用

当然，以下是一个关于如何在Flutter应用中使用places_service插件来获取地理位置服务的代码示例。这个插件允许你搜索地点、获取当前位置附近的地点等。

首先，你需要在pubspec.yaml文件中添加places_service依赖：

dependencies:
  flutter:
    sdk: flutter
  places_service: ^0.x.x  # 请替换为最新版本号

然后，运行flutter pub get来安装依赖。

接下来，是一个简单的示例代码，展示如何使用places_service插件来搜索地点和获取当前位置附近的地点。

import 'package:flutter/material.dart';
import 'package:places_service/places_service.dart';
import 'package:geolocator/geolocator.dart';
import 'package:geocoding/geocoding.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Places Service Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final PlacesService _placesService = PlacesService();
  List<Prediction> _suggestions = [];
  List<Place> _nearbyPlaces = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Places Service Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          children: [
            TextField(
              decoration: InputDecoration(
                labelText: 'Search Place',
                suffixIcon: IconButton(
                  icon: Icon(Icons.search),
                  onPressed: _searchPlace,
                ),
              ),
              onChanged: (value) async {
                setState(() {
                  _suggestions = await _placesService.getAutocompletePredictions(value);
                });
              },
            ),
            SizedBox(height: 16),
            Expanded(
              child: _suggestions.isEmpty
                  ? Center(child: Text('No suggestions'))
                  : ListView.builder(
                      itemCount: _suggestions.length,
                      itemBuilder: (context, index) => ListTile(
                        title: Text(_suggestions[index].description),
                        onTap: () async {
                          final PlaceDetails placeDetails =
                              await _placesService.getDetailsByPlaceId(_suggestions[index].placeId);
                          // 这里你可以处理获取到的placeDetails，比如显示详情
                          print(placeDetails.toJson());
                        },
                      ),
                    ),
            ),
            SizedBox(height: 16),
            ElevatedButton(
              onPressed: _getNearbyPlaces,
              child: Text('Get Nearby Places'),
            ),
            SizedBox(height: 16),
            Expanded(
              child: _nearbyPlaces.isEmpty
                  ? Center(child: Text('No nearby places'))
                  : ListView.builder(
                      itemCount: _nearbyPlaces.length,
                      itemBuilder: (context, index) => ListTile(
                        title: Text(_nearbyPlaces[index].name),
                        subtitle: Text(_nearbyPlaces[index].vicinity),
                      ),
                    ),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _searchPlace() async {} // 这个方法为空，因为搜索逻辑已经在TextField的onChanged中处理

  Future<void> _getNearbyPlaces() async {
    bool serviceEnabled;
    LocationPermission permission;

    // Test if location services are enabled.
    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.');
    }

    Position position = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high);
    List<Placemark> placemarks =
        await placemarkFromCoordinates(position.latitude, position.longitude);

    PlaceSearchRequest request = PlaceSearchRequest(
      location: LatLng(position.latitude, position.longitude),
      radius: 1500,
      type: ['restaurant'],
    );

    _nearbyPlaces = await _placesService.searchNearby(request);
    setState(() {});
  }
}

在这个示例中：

1. 搜索地点：在TextField中输入地点名称，会触发自动完成建议的获取。
2. 获取附近地点：点击“Get Nearby Places”按钮，应用会请求当前位置，并搜索附近的餐厅（你可以根据需要修改搜索类型）。

请注意，这个示例假设你已经处理好了必要的权限请求（如位置权限）。此外，places_service和geolocator插件可能需要你添加额外的配置到AndroidManifest.xml和Info.plist文件中，以便正确请求权限和访问位置服务。

确保你阅读并遵循这些插件的官方文档中的配置步骤，以确保一切正常工作。