flutter实现NFC读写
在Flutter中实现NFC读写功能,你可以使用nfc_in_flutter
这个插件。以下是一个简单的使用示例:
首先,在你的pubspec.yaml
文件中添加依赖:
dependencies:
flutter:
sdk: flutter
nfc_in_flutter: ^0.4.0
然后,获取NFC权限并开始监听标签:
import 'package:flutter/material.dart';
import 'package:nfc_in_flutter/nfc_in_flutter.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
home: NfcReaderPage(),
);
}
}
class NfcReaderPage extends StatefulWidget {
@override
_NfcReaderPageState createState() => _NfcReaderPageState();
}
class _NfcReaderPageState extends State<NfcReaderPage> {
NfcData? _nfcData;
@override
void initState() {
super.initState();
_startNfcListener();
}
void _startNfcListener() async {
// 请求NFC权限
var status = await NfcInFlutter.startNfcTagSession(onDiscovered: (NfcTag tag) {
setState(() {
_nfcData = NfcData(
type: tag.type,
id: tag.id,
payload: tag.payload,
);
});
});
if (status == NfcTagType.iso14443TypeA) {
// 当使用TYPE A标签时的特定处理
}
}
@override
void dispose() {
NfcInFlutter.stopNfcTagSession();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('NFC Reader'),
),
body: Center(
child: _nfcData != null
? Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('NFC Tag Type: ${_nfcData!.type}'),
Text('NFC Tag ID: ${_nfcData!.id}'),
Text('NFC Tag Payload: ${_nfcData!.payload}'),
],
)
: Text('Scanning for NFC tags...'),
),
);
}
}
class NfcData {
final String type;
final String id;
final String payload;
NfcData({required this.type, required this.id, required this.payload});
}
请注意,这个示例只是一个基本的实现,你可能需要根据自己的需求进行相应的调整。例如,处理NDEF消息、格式化NDEF数据或写入NDEF数据等。此外,你还需要确保你的设备支持NFC,并且在真实设备上测试NFC功能,因为并非所有的Android模拟器都支持NFC。
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