nfc_tag_reader 0.1.0

nfc_tag_reader: ^0.1.0 copied to clipboard

example/lib/main.dart

import 'dart:async';

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

void main() => runApp(const ExampleApp());

/// A minimal example of the `nfc_tag_reader` plugin: check availability, start a
/// reader session, and list the records of each scanned tag.
///
/// (The `nfc_tag_reader_demo` sibling project shows a more polished, fintech-styled
/// UI built on the same plugin.)
class ExampleApp extends StatelessWidget {
  const ExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'nfc_tag_reader example',
      theme: ThemeData(colorSchemeSeed: Colors.indigo, useMaterial3: true),
      home: const _HomePage(),
    );
  }
}

class _HomePage extends StatefulWidget {
  const _HomePage();

  @override
  State<_HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<_HomePage> {
  final NfcTagReader _nfc = NfcTagReader();
  StreamSubscription<NfcTag>? _subscription;

  bool _available = false;
  bool _scanning = false;
  String? _status;
  final List<NfcTag> _tags = [];

  @override
  void initState() {
    super.initState();
    _refreshAvailability();
    _subscription = _nfc.tags.listen(
      (tag) => setState(() => _tags.insert(0, tag)),
      onError: (Object error) {
        final message = error is NfcException ? error.message : '$error';
        setState(() => _status = 'Error: $message');
      },
    );
  }

  @override
  void dispose() {
    _subscription?.cancel();
    _nfc.stopSession();
    super.dispose();
  }

  Future<void> _refreshAvailability() async {
    final available = await _nfc.isAvailable();
    setState(() => _available = available);
  }

  Future<void> _toggleScan() async {
    if (_scanning) {
      await _nfc.stopSession();
      setState(() {
        _scanning = false;
        _status = 'Stopped.';
      });
      return;
    }

    try {
      await _nfc.startSession();
      setState(() {
        _scanning = true;
        _status = 'Hold a tag near the phone…';
      });
    } on NfcException catch (e) {
      setState(() => _status = e.message);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('nfc_tag_reader example')),
      body: Column(
        children: [
          ListTile(
            leading: Icon(_available ? Icons.nfc : Icons.block),
            title: Text('NFC available: $_available'),
            subtitle: _status == null ? null : Text(_status!),
            trailing: FilledButton(
              onPressed: _toggleScan,
              child: Text(_scanning ? 'Stop' : 'Scan'),
            ),
          ),
          const Divider(height: 1),
          Expanded(
            child: _tags.isEmpty
                ? const Center(child: Text('No tags scanned yet.'))
                : ListView.builder(
                    itemCount: _tags.length,
                    itemBuilder: (context, i) {
                      final tag = _tags[i];
                      return ListTile(
                        title: Text('Tag ${tag.id}'),
                        subtitle: Text(
                          tag.records.isEmpty
                              ? 'No NDEF records'
                              : tag.records.map((r) => r.describe()).join('\n'),
                        ),
                        isThreeLine: tag.records.length > 1,
                      );
                    },
                  ),
          ),
        ],
      ),
    );
  }
}