Flutter插件flutter_vegvesen的使用方法详解

flutter_vegvesen 是一个用于从挪威交通局（Vegvesen）API 获取车辆信息的Flutter插件。通过此插件，开发者可以轻松地查询特定车牌号的车辆详细信息。本文将探讨该插件的潜在用途，并提供一个完整的示例演示如何使用它。

示例

以下是一个简单的示例代码，展示了如何使用 flutter_vegvesen 插件来获取车辆信息：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: VehicleInfoScreen(),
    );
  }
}

class VehicleInfoScreen extends StatefulWidget {
  @override
  _VehicleInfoScreenState createState() => _VehicleInfoScreenState();
}

class _VehicleInfoScreenState extends State<VehicleInfoScreen> {
  String _vehicleInfo = '等待查询...';
  final Vegvesen vegvesen = Vegvesen(bilskilt: 'EB65943');

  Future<void> fetchVehicleInfo() async {
    try {
      Kjoretoy kjoretoy = await vegvesen.hentKjoretoy();
      setState(() {
        _vehicleInfo = '车辆信息: $kjoretoy';
      });
    } catch (e) {
      setState(() {
        _vehicleInfo = '查询失败: $e';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('车辆信息查询'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: fetchVehicleInfo,
              child: Text('查询车辆信息'),
            ),
            SizedBox(height: 20),
            Text(_vehicleInfo),
          ],
        ),
      ),
    );
  }
}

代码解释

1. 导入必要的包：

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

2. 创建主应用类：

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

3. 创建主界面类：

   class MyApp extends StatelessWidget {
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         home: VehicleInfoScreen(),
       );
     }
   }
   

4. 创建查询车辆信息的屏幕类：

   class VehicleInfoScreen extends StatefulWidget {
     @override
     _VehicleInfoScreenState createState() => _VehicleInfoScreenState();
   }
   

5. 实现状态类：

   class _VehicleInfoScreenState extends State<VehicleInfoScreen> {
     String _vehicleInfo = '等待查询...';
     final Vegvesen vegvesen = Vegvesen(bilskilt: 'EB65943');
   
     Future<void> fetchVehicleInfo() async {
       try {
         Kjoretoy kjoretoy = await vegvesen.hentKjoretoy();
         setState(() {
           _vehicleInfo = '车辆信息: $kjoretoy';
         });
       } catch (e) {
         setState(() {
           _vehicleInfo = '查询失败: $e';
         });
       }
     }
   
     @override
     Widget build(BuildContext context) {
       return Scaffold(
         appBar: AppBar(
           title: Text('车辆信息查询'),
         ),
         body: Center(
           child: Column(
             mainAxisAlignment: MainAxisAlignment.center,
             children: [
               ElevatedButton(
                 onPressed: fetchVehicleInfo,
                 child: Text('查询车辆信息'),
               ),
               SizedBox(height: 20),
               Text(_vehicleInfo),
             ],
           ),
         ),
       );
     }
   }