fints 0.1.2

FinTS 3.0 and 4.1 client for German banks. Retrieves accounts, balances and transactions with PIN/TAN, two-step TAN, decoupled approval and PSD2 strong customer authentication.

example/lib/main.dart

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

import 'bank_directory.dart';
import 'login_page.dart';
import 'tan_ui.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorKey: navigatorKey,
      scaffoldMessengerKey: messengerKey,
      title: 'FinTS Beispiel',
      locale: const Locale('de'),
      supportedLocales: const [Locale('de')],
      localizationsDelegates: GlobalMaterialLocalizations.delegates,
      theme: ThemeData(colorSchemeSeed: Colors.indigo),
      darkTheme: ThemeData(colorSchemeSeed: Colors.indigo, brightness: Brightness.dark),
      home: const BankListPage(),
    );
  }
}

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

  @override
  State<BankListPage> createState() => _BankListPageState();
}

class _BankListPageState extends State<BankListPage> {
  final _banks = loadBankDirectory();
  String _query = '';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Bank auswählen'),
        actions: [
          IconButton(
            icon: const Icon(Icons.info_outline),
            tooltip: 'Lizenzen',
            onPressed: () => showLicensePage(context: context, applicationName: 'FinTS Beispiel'),
          ),
        ],
      ),
      body: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(12),
            child: TextField(
              decoration: const InputDecoration(
                prefixIcon: Icon(Icons.search),
                hintText: 'Name, Ort, BLZ oder BIC',
                border: OutlineInputBorder(),
              ),
              onChanged: (value) => setState(() => _query = value.trim()),
            ),
          ),
          Expanded(
            child: FutureBuilder<List<Bank>>(
              future: _banks,
              builder: (context, snapshot) {
                if (snapshot.hasError) {
                  return Center(
                    child: Padding(
                      padding: const EdgeInsets.all(24),
                      child: Text(
                        'Die Bankliste konnte nicht geladen werden. Legen Sie die FinTS-Institutsliste als '
                        'assets/fints_institute.csv ab.\n\n${snapshot.error}',
                        textAlign: TextAlign.center,
                      ),
                    ),
                  );
                }
                final banks = snapshot.data;
                if (banks == null) return const Center(child: CircularProgressIndicator());
                final filtered = _query.isEmpty ? banks : banks.where((b) => b.matches(_query)).toList();
                return ListView.builder(
                  itemCount: filtered.length,
                  itemBuilder: (context, i) {
                    final bank = filtered[i];
                    return ListTile(
                      title: Text(bank.name),
                      subtitle: Text([bank.bankCode, bank.bic, bank.city].where((s) => s.isNotEmpty).join(' · ')),
                      onTap: () =>
                          Navigator.push(context, MaterialPageRoute<void>(builder: (_) => LoginPage(bank: bank))),
                    );
                  },
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}