bx_btprinter 0.0.2

This Flutter plugin allows you to connect to a Bixolon printer via Bluetooth and send print commands. The files in the libs folder belong to Bixolon.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:bx_btprinter/btprinter.dart';

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

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _btprinterPlugin = Btprinter();

  List<String?> _devices = [];
  final GlobalKey<ScaffoldState> _scaffoldKey =
      GlobalKey<ScaffoldState>(); // Scaffold의 key

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

    initBle();
  }

  void initBle() async {
    await _getBle();
  }

  Future<void> _getBle() async {
    String? value;
    try {
      value = await _btprinterPlugin.getBtPermission();
    } on PlatformException catch (e) {
      value = 'native code error: ${e.message}';
    }
    print(value);
    _showSnackBar(value!, value == "success" ? true : false);
  }

  Future<void> _print(String? device) async {
    List<String> deviceInfo = device!.split('(');
    String logicalName = deviceInfo[0].split("_")[0].trim();
    String address = deviceInfo[1].replaceAll(')', '').trim();

    // 텍스트 출력을 위한 요청 객체 생성
    List<Map<String, dynamic>> textRequests = [
      {
        'text': 'Alignment Left\n',
        'textAlignment': Btprinter.ALIGNMENT_LEFT,
        'textAttribute': Btprinter.ATTRIBUTE_NORMAL,
        'textSize': 1,
      },
      {
        'text': 'Alignment Center\n',
        'textAlignment': Btprinter.ALIGNMENT_CENTER,
        'textAttribute': Btprinter.ATTRIBUTE_NORMAL,
        'textSize': 1,
      },
      {
        'text': 'Alignment Right\n',
        'textAlignment': Btprinter.ALIGNMENT_RIGHT,
        'textAttribute': Btprinter.ATTRIBUTE_NORMAL,
        'textSize': 1,
      },
      {
        'text': 'Point Size 2\n',
        'textSize': 2,
      },
      {
        'text': 'Font Reserve On 2\n',
        'textAttribute': Btprinter.ATTRIBUTE_REVERSE,
        'textSize': 1,
      },
      {
        'text': 'Font Bold On\n',
        'textAttribute': Btprinter.ATTRIBUTE_BOLD,
        'textSize': 1,
      },
      {
        'text': 'Font UnderLine\n',
        'textAttribute': Btprinter.ATTRIBUTE_UNDERLINE,
        'textSize': 1,
      },
    ];

    List<Map<String, dynamic>> barcodeRequests = [
      {
        'data': ' ',
        'symbology': Btprinter.BARCODE_TYPE_QRCODE,
        'width': 2,
        'height': 2,
        'alignment': Btprinter.ALIGNMENT_CENTER,
        'hri': Btprinter.BARCODE_HRI_NONE,
      },
      {
        'data': '123456789012',
        'symbology': Btprinter.BARCODE_TYPE_ITF,
        'alignment': Btprinter.ALIGNMENT_CENTER,
        'hri': Btprinter.BARCODE_HRI_BELOW,
      },
    ];

    String? value;
    try {
      value =
          await _btprinterPlugin.printText(textRequests, logicalName, address);
      value = await _btprinterPlugin.printBarcode(
          barcodeRequests, logicalName, address);
    } on PlatformException catch (e) {
      value = "${e.message}";
    }
    print(value);
    _showSnackBar(value!, value == "success" ? true : false);
  }

  void _getPairedDevices() async {
    String value;
    try {
      List<Object?> devices = await _btprinterPlugin.getPairedDevices();
      setState(() {
        _devices = devices
            .cast<String>()
            .where((device) => device.startsWith('SPP')) //SPP로 시작하는 장치만 가져옴
            .toList();
      });
    } on PlatformException catch (e) {
      value = "${e.message}";
      print(value);
      _showSnackBar(value, false);
    }
  }

  void _showSnackBar(String message, bool isSuccess) {
    final snackBar = SnackBar(
      content: Text(message),
      duration: const Duration(seconds: 5),
      behavior: SnackBarBehavior.floating,
      shape: const StadiumBorder(),
      backgroundColor: Colors.blue,
    );

    final errSnackBar = SnackBar(
      content: Text(message),
      duration: const Duration(seconds: 5),
      behavior: SnackBarBehavior.floating,
      shape: const StadiumBorder(),
      backgroundColor: Colors.red,
    );

    if (isSuccess) {
      ScaffoldMessenger.of(_scaffoldKey.currentContext!).showSnackBar(snackBar);
    } else {
      ScaffoldMessenger.of(_scaffoldKey.currentContext!)
          .showSnackBar(errSnackBar);
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        key: _scaffoldKey, //Scaffold에 key 할당
        appBar: AppBar(
          title: const Text('Bluetooth Device List'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              ElevatedButton(
                  onPressed: _getPairedDevices,
                  child: const Text('블루투스 기기 목록 조회')),
              Container(
                height: 200,
                child: _devices == null || _devices.isEmpty
                    ? const Center(
                        child: Text('연결된 기기를 찾을 수 없습니다.'),
                      )
                    : ListView.builder(
                        itemCount: _devices.length,
                        itemBuilder: (context, index) {
                          String? deviceName =
                              _devices[index]?.split('(')[0].trim();
                          return ListTile(
                            title: Text(deviceName ?? ''),
                            onTap: () async {
                              await _print(_devices[index]);
                            },
                          );
                        },
                      ),
              )
            ],
          ),
        ),
      ),
    );
  }
}