Flutter NFC读写操作插件nfc_read_write_plugin的使用

Flutter NFC读写操作插件nfc_read_write_plugin的使用

获取开始

在使用 nfc_read_write_plugin 插件之前，确保你已经在你的 Flutter 项目中添加了该依赖。在 pubspec.yaml 文件中添加以下依赖：

dependencies:
  nfc_read_write_plugin: ^版本号

然后运行 flutter pub get 来获取依赖。

设置

Android 设置

1. 权限配置
   在 AndroidManifest.xml 文件中添加 NFC 权限：

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

2. 修改 MainActivity.java
   修改 MainActivity.java 文件以支持 NFC 功能：

   import android.app.PendingIntent;
   import android.content.Intent;
   import android.content.IntentFilter;
   import android.nfc.NfcAdapter;
   import android.nfc.tech.NfcA;
   import android.nfc.tech.NfcV;
   import io.flutter.embedding.android.FlutterActivity;
   
   public class MainActivity extends FlutterActivity {
       protected String[][] techList;
       protected IntentFilter[] intentFilters;
       protected PendingIntent pendingIntent;
       @Override
       protected void onResume() {
           super.onResume();
           techList = new String[][] { 
               new String[] { NfcV.class.getName() },
               new String[] { NfcA.class.getName() } 
           };
           intentFilters = new IntentFilter[] { 
               new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED), 
           };
           // 创建一个 PendingIntent 对象, 这样Android系统就能在一个tag被检测到时定位到这个对象
           pendingIntent = PendingIntent.getActivity(this, 0,
                   new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
           NfcAdapter.getDefaultAdapter(this).enableForegroundDispatch(this, pendingIntent, intentFilters, techList);
       }
   
       @Override
       protected void onPause() {
           super.onPause();
           NfcAdapter.getDefaultAdapter(this).disableForegroundDispatch(this);
       }
   }
   

示例代码

以下是一个完整的示例代码，展示了如何使用 nfc_read_write_plugin 插件进行 NFC 读写操作。

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

import 'package:flutter/services.dart';
import 'package:nfc_read_write_plugin/nfc_read_write_plugin.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

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

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  dynamic result;

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

  initEvent() async {
    await NfcReadWritePlugin.eventListen(onEvent: (message) {
      setState(() {
        result = message;
      });
    });
  }

  // 平台消息是异步的，因此我们在异步方法中初始化。
  Future<void> initPlatformState() async {
    String platformVersion;
    // 平台消息可能失败，所以我们使用try/catch来处理PlatformException。
    try {
      platformVersion = await NfcReadWritePlugin.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // 如果在异步平台消息飞行期间小部件从树中删除，我们希望丢弃回复而不是调用setState来更新我们的非存在外观。
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: SingleChildScrollView(
          child: Column(
            children: [
              Text('Running on: $_platformVersion\n'),
              Text('事件监听：${result?.toString()}'),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.initService(
                      "42374D4C3546", "B10A23D18F20");
                  debugPrint("dart...$data");
                },
                child: const Text("initService"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.readAll(decrypt: true);

                  debugPrint("dart...$data");
                },
                child: const Text("readAll decrypt: true"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.readAll();
                  debugPrint("dart...$data");
                },
                child: const Text("readAll"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.writeBlock(40, "你好测试一下");
                  debugPrint("dart...$data");
                },
                child: const Text("writeBlock"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.readSector(10);
                  debugPrint("dart...$data");
                },
                child: const Text("readSector"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data =
                      await NfcReadWritePlugin.readSector(10, decrypt: true);
                  debugPrint("dart...$data");
                },
                child: const Text("readSector decrypt: true"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.writeBlock(40, "你好测试一下",
                      encrypt: true);
                  debugPrint("dart...$data");
                },
                child: const Text("writeBlock encrypt: true"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data =
                      await NfcReadWritePlugin.readBlock(40, decrypt: true);
                  debugPrint("dart...$data");
                },
                child: const Text("readBlock decrypt: true"),
              ),
              ElevatedButton(
                onPressed: () async {
                  var data = await NfcReadWritePlugin.readBlock(
                    40,
                  );
                  debugPrint("dart...$data");
                },
                child: const Text("readBlock  "),
              )
            ],
          ),
        ),
      ),
    );
  }
}