Flutter路线规划插件flutter_driving_directions的使用

当然，以下是如何在Flutter项目中使用flutter_driving_directions插件来实现路线规划的一个简单示例。这个插件允许你从一个地点导航到另一个地点，并显示相关的路线信息。

首先，确保你已经在pubspec.yaml文件中添加了flutter_driving_directions依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_driving_directions: ^0.0.8  # 请注意版本号，这里使用的是示例版本号，实际使用时请检查最新版本

然后运行flutter pub get来安装依赖。

接下来，在你的Flutter应用中，你可以使用以下代码来实现路线规划功能：

import 'package:flutter/material.dart';
import 'package:flutter_driving_directions/flutter_driving_directions.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(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Route Planning'),
        ),
        body: RoutePlanningPage(),
      ),
    );
  }
}

class RoutePlanningPage extends StatefulWidget {
  @override
  _RoutePlanningPageState createState() => _RoutePlanningPageState();
}

class _RoutePlanningPageState extends State<RoutePlanningPage> {
  TextEditingController _originController = TextEditingController();
  TextEditingController _destinationController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          TextField(
            controller: _originController,
            decoration: InputDecoration(labelText: 'Origin Address'),
          ),
          SizedBox(height: 16),
          TextField(
            controller: _destinationController,
            decoration: InputDecoration(labelText: 'Destination Address'),
          ),
          SizedBox(height: 16),
          ElevatedButton(
            onPressed: _getDirections,
            child: Text('Get Directions'),
          ),
        ],
      ),
    );
  }

  Future<void> _getDirections() async {
    // 获取起点和终点的地理位置
    LocationResult originLocation = await placemarkFromAddress(_originController.text);
    LocationResult destinationLocation = await placemarkFromAddress(_destinationController.text);

    if (originLocation.placemarks.isNotEmpty && destinationLocation.placemarks.isNotEmpty) {
      Placemark originPlacemark = originLocation.placemarks.first;
      Placemark destinationPlacemark = destinationLocation.placemarks.first;

      // 使用flutter_driving_directions插件获取路线
      DrivingDirectionsOptions options = DrivingDirectionsOptions(
        start: LatLng(originPlacemark.position.latitude, originPlacemark.position.longitude),
        end: LatLng(destinationPlacemark.position.latitude, destinationPlacemark.position.longitude),
        travelMode: TravelMode.driving,
      );

      DrivingDirections drivingDirections = DrivingDirections.from(options);

      List<DrivingRoute> routes = await drivingDirections.getRoute();

      if (routes.isNotEmpty) {
        DrivingRoute firstRoute = routes.first;
        // 这里你可以显示路线信息，例如路线长度、步骤等
        print('Total distance in Meters: ${firstRoute.distance!.inMeters}');
        print('Duration in Minutes: ${firstRoute.duration!.inMinutes}');

        // 显示路线步骤（可选）
        firstRoute.points!.forEach((DrivingPoint point) {
          print('Location: ${point.location}, Instructions: ${point.instructions}');
        });
      } else {
        print('No routes found.');
      }
    } else {
      print('Error getting locations.');
    }
  }

  Future<LocationResult> placemarkFromAddress(String address) async {
    List<Placemark> placemarks = await placemarkFromCoordinates(await getCurrentPosition());
    return LocationResult.fromPlacemarks(placemarks.where((Placemark p) => p.locality == address || p.thoroughfare == address || p.subThoroughfare == address || p.postalCode == address).toList());
  }

  Future<Position> getCurrentPosition() async {
    bool serviceEnabled;
    LocationPermission permission;

    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.');
    }

    return await Geolocator.getCurrentPosition(desiredAccuracy: LocationAccuracy.high);
  }
}

注意：

1. geolocator和geocoding插件用于获取地理位置和地址解析。你可能需要在AndroidManifest.xml和Info.plist中添加相应的权限。
2. flutter_driving_directions插件依赖于Google Maps API，因此你可能需要设置Google Maps API key。
3. 由于flutter_driving_directions插件的API和功能可能会随时间变化，请参考最新的官方文档以确保代码的正确性和兼容性。

这个示例代码展示了如何从地址输入中获取起点和终点的地理位置，并使用flutter_driving_directions插件获取路线信息。你可以根据需求进一步扩展和修改这个示例。