bt_printer_plugin 0.1.3

bt_printer_plugin: ^0.1.3 copied to clipboard

example/lib/main.dart

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

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'BT Printer Test',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        useMaterial3: true,
        colorSchemeSeed: Colors.green,
        scaffoldBackgroundColor: Colors.white,
      ),
      home: const PrinterScreen(),
    );
  }
}

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

  @override
  State<PrinterScreen> createState() => _PrinterScreenState();
}

class _PrinterScreenState extends State<PrinterScreen> {
  List<Map<String, String>> _printers = [];
  String? _connectedPrinter;
  bool _isLoading = false;
  String _status = '';

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

  Future<void> _fetchPrinters() async {
    setState(() {
      _isLoading = true;
      _status = 'Scanning for devices...';
    });

    try {
      final devices = await BtPrinterPlugin.getPairedDevices();

      setState(() {
        _printers = devices;
        _status = devices.isEmpty ? 'No printers found.' : 'Select a printer';
      });
    } catch (e) {
      setState(() {
        _status = 'Failed to get devices: $e';
        _printers = [];
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<void> _connectPrinter(String address, String name) async {
    if (address.isEmpty) return;

    setState(() {
      _status = 'Connecting...';
    });

    try {
      final success = await BtPrinterPlugin.connect(address);
      setState(() {
        _connectedPrinter = success ? address : null;
        _status = success ? 'Connected to $name' : 'Connection failed';
      });
    } catch (e) {
      setState(() {
        _status = 'Connection error: $e';
      });
    }
  }

  Future<void> _printTestTicket() async {
    if (_connectedPrinter == null) return;

    const ticket = '''
\x1B\x40
\x1B\x61\x01Hello from Flutter
\x0AThis is a Bluetooth print test message.
\x0A\x0AThank you.
\x0A\x0A
''';

    try {
      final success = await BtPrinterPlugin.printRaw(ticket);

      setState(() {
        _status = success ? 'Test message sent to printer.' : 'Print failed.';
      });
    } catch (e) {
      setState(() {
        _status = 'Print error: $e';
      });
    }
  }

  Widget _buildPrinterTile(Map<String, String> printer) {
    final isConnected = printer['address'] == _connectedPrinter;
    return Card(
      elevation: 1,
      margin: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
      child: ListTile(
        leading: const Icon(Icons.print, color: Colors.green),
        title: Text(printer['name'] ?? 'Unknown'),
        subtitle: Text(printer['address'] ?? ''),
        trailing: isConnected
            ? const Icon(Icons.check_circle, color: Colors.green)
            : OutlinedButton(
                onPressed: () => _connectPrinter(
                  printer['address'] ?? '',
                  printer['name'] ?? '',
                ),
                child: const Text("Connect"),
              ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text(
          'Select Printer',
          style: TextStyle(color: Colors.white),
        ),
        iconTheme: const IconThemeData(color: Colors.white),
        backgroundColor: Colors.green,
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _fetchPrinters,
          ),
        ],
      ),
      body: Column(
        children: [
          if (_isLoading) const LinearProgressIndicator(),
          Padding(
            padding: const EdgeInsets.all(12.0),
            child: Row(
              children: [
                const Icon(Icons.info_outline, size: 20, color: Colors.grey),
                const SizedBox(width: 8),
                Expanded(
                  child: Text(_status, style: const TextStyle(fontSize: 16)),
                ),
              ],
            ),
          ),
          Expanded(
            child: ListView.builder(
              itemCount: _printers.length,
              itemBuilder: (context, index) {
                return _buildPrinterTile(_printers[index]);
              },
            ),
          ),
          if (_connectedPrinter != null)
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: SizedBox(
                width: double.infinity,
                child: ElevatedButton(
                  onPressed: _printTestTicket,
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.green,
                    foregroundColor: Colors.white,
                    padding: const EdgeInsets.symmetric(vertical: 16),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(12),
                    ),
                  ),
                  child: const Text(
                    "Print Test",
                    style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600),
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }
}