mrt_card_reader 0.1.1

A Flutter package for reading transaction data from Dhaka MRT metro rail cards using NFC. Based on the work by the MRT Buddy team. This package allows you to easily access card balance and transaction [...]

example/lib/main.dart

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

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

class MrtReaderApp extends StatelessWidget {
  const MrtReaderApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Dhaka MRT Card Reader',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      home: const MrtReaderHomePage(),
    );
  }
}

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

  @override
  State<MrtReaderHomePage> createState() => _MrtReaderHomePageState();
}

class _MrtReaderHomePageState extends State<MrtReaderHomePage> {
  String _status = 'Ready to scan';
  int? _balance;
  final List<MrtTransaction> _transactions = [];
  bool _isNfcAvailable = false;

  @override
  void initState() {
    super.initState();
    _checkNfcAvailability();
  }

  Future<void> _checkNfcAvailability() async {
    final isAvailable = await MrtCardReader.isAvailable();
    setState(() {
      _isNfcAvailable = isAvailable;
      _status = isAvailable 
          ? 'NFC is available. Ready to scan.' 
          : 'NFC is not available on this device.';
    });
  }

  Future<void> _startScan() async {
    if (!_isNfcAvailable) {
      return;
    }

    setState(() {
      _status = 'Please tap your Dhaka MRT card...';
    });

    await MrtCardReader.startSession(
      onStatus: (status) {
        setState(() {
          _status = status;
        });
      },
      onBalance: (balance) {
        setState(() {
          _balance = balance;
        });
      },
      onTransactions: (transactions) {
        setState(() {
          _transactions.clear();
          _transactions.addAll(transactions);
        });
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Dhaka MRT Card Reader'),
        elevation: 2,
      ),
      body: Column(
        children: [
          // Status and balance section
          Container(
            padding: const EdgeInsets.all(16.0),
            color: Colors.grey[200],
            width: double.infinity,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Status: $_status',
                  style: const TextStyle(fontSize: 16),
                ),
                const SizedBox(height: 8),
                if (_balance != null) ...[
                  Text(
                    'Balance: ৳${(_balance! / 100).toStringAsFixed(2)}',
                    style: const TextStyle(
                      fontSize: 24,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ],
                const SizedBox(height: 16),
                Center(
                  child: ElevatedButton(
                    onPressed: _isNfcAvailable ? _startScan : null,
                    style: ElevatedButton.styleFrom(
                      padding: const EdgeInsets.symmetric(
                        horizontal: 32,
                        vertical: 12,
                      ),
                    ),
                    child: const Text(
                      'Scan Dhaka MRT Card',
                      style: TextStyle(fontSize: 16),
                    ),
                  ),
                ),
              ],
            ),
          ),

          // Transactions list for Line 6 metro
          Expanded(
            child: _transactions.isEmpty
                ? const Center(
                    child: Text('No transactions found. Scan your MRT card.'),
                  )
                : ListView.builder(
                    itemCount: _transactions.length,
                    itemBuilder: (context, index) {
                      final transaction = _transactions[index];
                      return Card(
                        margin: const EdgeInsets.symmetric(
                          horizontal: 16,
                          vertical: 4,
                        ),
                        child: ListTile(
                          title: Text(
                            transaction.isTopup
                                ? 'Top-up at ${transaction.fromStation}'
                                : 'Journey from ${transaction.fromStation} to ${transaction.toStation}',
                            style: const TextStyle(fontWeight: FontWeight.bold),
                          ),
                          subtitle: Text(transaction.timestamp),
                          trailing: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            crossAxisAlignment: CrossAxisAlignment.end,
                            children: [
                              if (transaction.cost != null)
                                Text(
                                  transaction.isTopup
                                      ? '+৳${(transaction.cost! / 100).toStringAsFixed(2)}'
                                      : '-৳${(transaction.cost! / 100).toStringAsFixed(2)}',
                                  style: TextStyle(
                                    color: transaction.isTopup
                                        ? Colors.green
                                        : Colors.red,
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                              Text(
                                'Balance: ৳${(transaction.balance / 100).toStringAsFixed(2)}',
                                style: TextStyle(
                                  color: Colors.grey[600],
                                  fontSize: 12,
                                ),
                              ),
                            ],
                          ),
                        ),
                      );
                    },
                  ),
          ),
        ],
      ),
    );
  }
}