Flutter NFC卡读取插件nfc_card的使用

Flutter NFC卡读取插件nfc_card的使用

获取开始

本项目是一个用于 Flutter 的新项目。它是一个专门的插件包，包括针对 Android 和/或 iOS 的平台特定实现代码。

对于 Flutter 开发的帮助，可以查看在线文档，其中包含教程、示例、移动开发指南以及完整的 API 参考。

示例代码

以下是使用 nfc_card 插件读取 NFC 卡的完整示例代码：

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

import 'package:flutter/services.dart';
import 'package:nfc_card/nfc_card.dart';
import 'package:nfc_card/nfc_card_method_channel.dart';
import 'package:nfc_card_example/second_page.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SecondPage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({super.key});

  [@override](/user/override)
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  String _platformVersion = 'Unknown';
  NFCAvailability? isAviable;
  String? card;
  final _nfcCardPlugin = NfcCard();

  [@override](/user/override)
  void initState() {
    super.initState();
    initPlatformState();
  }

  Future<void> initPlatformState() async {
    String platformVersion;
    try {
      isAviable = await _nfcCardPlugin.checkNFCAvailability();
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }
    if (!mounted) return;
    setState(() {});
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('NFC Card Reader Example'),
      ),
      body: Center(
        child: Column(
          children: [
            Text('NFC 可用性: ${isAviable}\n 卡片数据: $card'),
            TextButton(
              child: Text('开始读取'),
              onPressed: () async {
                String? result = await _nfcCardPlugin.read();
                Navigator.pop(context, result);
              },
            ),
            TextButton(
              child: Text('停止读取'),
              onPressed: () async {
                // 这里可以添加停止读取的逻辑
              },
            ),
          ],
        ),
      ),
    );
  }
}

说明

1. 导入必要的库：

   import 'package:flutter/material.dart';
   import 'dart:async';
   
   import 'package:flutter/services.dart';
   import 'package:nfc_card/nfc_card.dart';
   import 'package:nfc_card/nfc_card_method_channel.dart';
   

2. 初始化应用：

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

3. 定义主应用状态：

   class MyApp extends StatefulWidget {
     const MyApp({super.key});
   
     [@override](/user/override)
     State<MyApp> createState() => _MyAppState();
   }
   
   class _MyAppState extends State<MyApp> {
     [@override](/user/override)
     Widget build(BuildContext context) {
       return MaterialApp(
         home: SecondPage(),
       );
     }
   }
   

4. 定义主页面状态：

   class HomePage extends StatefulWidget {
     const HomePage({super.key});
   
     [@override](/user/override)
     State<HomePage> createState() => _HomePageState();
   }
   
   class _HomePageState extends State<HomePage> {
     String _platformVersion = 'Unknown';
     NFCAvailability? isAviable;
     String? card;
     final _nfcCardPlugin = NfcCard();
   
     [@override](/user/override)
     void initState() {
       super.initState();
       initPlatformState();
     }
   

5. 检查 NFC 可用性：

   Future<void> initPlatformState() async {
     try {
       isAviable = await _nfcCardPlugin.checkNFCAvailability();
     } on PlatformException {
       platformVersion = 'Failed to get platform version.';
     }
     if (!mounted) return;
     setState(() {});
   }
   

6. 构建页面：

   [@override](/user/override)
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: const Text('NFC 卡读取示例'),
       ),
       body: Center(
         child: Column(
           children: [
             Text('NFC 可用性: ${isAviable}\n 卡片数据: $card'),
             TextButton(
               child: Text('开始读取'),
               onPressed: () async {
                 String? result = await _nfcCardPlugin.read();
                 Navigator.pop(context, result);
               },
             ),
             TextButton(
               child: Text('停止读取'),
               onPressed: () async {
                 // 这里可以添加停止读取的逻辑
               },
             ),
           ],
         ),
       ),
     );
   }