144 lines
4.4 KiB
Dart
144 lines
4.4 KiB
Dart
import 'dart:convert';
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:nfc_manager/nfc_manager.dart';
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import 'package:nfc_manager/ndef_record.dart';
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import 'package:nfc_manager/nfc_manager_android.dart';
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import 'package:nfc_manager/nfc_manager_ios.dart';
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import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
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class NfcTestPage extends StatefulWidget {
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const NfcTestPage({Key? key}) : super(key: key);
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@override
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_NfcTestPageState createState() => _NfcTestPageState();
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}
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class _NfcTestPageState extends State<NfcTestPage> {
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String _nfcData = '未扫描到标签。';
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bool _scanning = false;
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void _safeSetState(String data) {
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if (!mounted) return;
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setState(() => _nfcData = data);
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}
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Future<void> _startNfcSession() async {
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setState(() {
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_scanning = true;
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_nfcData = '扫描中...';
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});
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final available = await NfcManager.instance.isAvailable();
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if (!available) {
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_safeSetState('此设备不支持 NFC');
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setState(() => _scanning = false);
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return;
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}
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NfcManager.instance.startSession(
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onDiscovered: (NfcTag tag) async {
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String text = '未知';
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try {
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final ndef = Ndef.from(tag);
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if (ndef == null) {
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_safeSetState('标签不支持 NDEF');
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} else {
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final msg = ndef.cachedMessage;
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if (msg == null || msg.records.isEmpty) {
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_safeSetState('未找到任何 NDEF 记录');
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} else {
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// 第一条记录
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final record = msg.records.first;
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text = _parseTextRecord(record);
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_safeSetState('读取到文本: "$text"');
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}
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}
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String uid = '未知';
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try {
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if (Platform.isAndroid) {
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final nfcA = NfcAAndroid.from(tag);
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if (nfcA != null) {
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// 正确地通过 nfcA.tag.identifier 拿到 List<int>
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final bytes = nfcA.tag.id;
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uid = bytes
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.map((b) => b.toRadixString(16).padLeft(2, '0'))
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.join(':')
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.toUpperCase();
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}
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} else if (Platform.isIOS) {
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// iOS 平台，用 MiFareIos（对于大多数 ISO14443-A，也可以用 Iso7816Ios）
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final mifare = MiFareIos.from(tag);
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final bytes = mifare!.identifier;
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uid = bytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join(':').toUpperCase();
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}
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} catch (e) {
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debugPrint('取 UID 错误: $e');
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} finally {
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setState(() => _nfcData = '标签 UID: $uid' + '\n读取到文本: "$text"');
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await NfcManager.instance.stopSession();
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}
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} catch (e) {
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_safeSetState('解析时出错: $e');
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} finally {
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await NfcManager.instance.stopSession();
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if (mounted) setState(() => _scanning = false);
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}
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},
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pollingOptions: {NfcPollingOption.iso14443},
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);
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}
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/// 解析一个 NDEF Text 记录的 payload，返回纯文本内容
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String _parseTextRecord(NdefRecord record) {
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final payload = record.payload;
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if (payload.isEmpty) return '';
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final statusByte = payload[0];
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final langCodeLen = statusByte & 0x3F;
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// 文本数据开始的位置
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final textBytes = payload.sublist(1 + langCodeLen);
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try {
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return utf8.decode(textBytes); // 默认 UTF‑8
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} catch (e) {
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// 解码失败时，退回到直接展示 bytes
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return String.fromCharCodes(textBytes);
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}
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}
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@override
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void dispose() {
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NfcManager.instance.stopSession();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(title: const Text('NFC 测试')),
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body: Padding(
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padding: const EdgeInsets.all(16.0),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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ElevatedButton(
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onPressed: _scanning ? null : _startNfcSession,
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child: Text(_scanning ? '扫描中...' : '开始扫描 NFC'),
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),
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const SizedBox(height: 24),
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Expanded(
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child: SingleChildScrollView(
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child: Text(_nfcData, style: const TextStyle(fontSize: 16)),
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),
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),
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],
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),
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),
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);
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}
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}
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