bluetooth_printer_plugin 0.0.1

Connecting apps to bluetooth printer

example/lib/main.dart

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

import 'package:flutter/services.dart';
import 'package:bluetooth_printer_plugin/bluetooth_printer_plugin.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 _bluetoothPrinterPlugin = BluetoothPrinter();

  bool _isLoading = false;
  List<dynamic> _devices = [];

  String? _errorCode;

  String? _selectedAddress;

  Future<void> _init() async {
    try {
      setState(() { 
        _errorCode = null;
        _isLoading = true;
      });
      _devices = (await _bluetoothPrinterPlugin.getBondedDevices()) ?? [];
      print(_devices);
      setState(() { _isLoading = false; });
    } catch (e) {
      setState(() {
        _isLoading = false;
        _errorCode = (e is PlatformException) ? e.code : 'UNKNOWN_ERROR';
      });
    }
  }

  Future<bool?> _allowBluetooth() async {
    try {
      bool? res = await _bluetoothPrinterPlugin.requestBluetoothPermission();
      return res;
    } catch(e) {
      return null;
    }
  }

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) async { _init(); });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: SingleChildScrollView(
            child: _isLoading ? Center(
              child: CircularProgressIndicator()
            ) : Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                if(_errorCode == 'BLUETOOTH_PERMISSION_REQUIRED') Container(
                  constraints: BoxConstraints(
                    maxWidth: 250
                  ),
                  child: Column(
                    spacing: 16,
                    children: [
                      Text("Aplikasi membutuhkan akses ke bluetooth anda", textAlign: TextAlign.center),
                      ElevatedButton(onPressed: () async {
                        bool? res = await _allowBluetooth();
                        if(res == null) return;
                        if(res == true) _init();
                      }, child: Text("Beri Izin"))
                    ],
                  ),
                ),
                if(_errorCode == 'BLUETOOTH_NOT_ENABLED') Container(
                  constraints: BoxConstraints(
                    maxWidth: 250
                  ),
                  child: Column(
                    spacing: 16,
                    children: [
                      Text("Pastikan bluetooth pada perangkat anda menyala, lalu tekan tombol berikut", textAlign: TextAlign.center),
                      ElevatedButton(onPressed: () async {
                        _init();
                      }, child: Text("Reload"))
                    ],
                  ),
                ),
                SizedBox(height: 20),
                Text(_errorCode ?? ""),
                SizedBox(height: 20),
                ..._devices.map((dynamic d) => ListTile(
                  title: Text(d["name"]),
                  subtitle: Text(d["address"]),
                  trailing: _selectedAddress == d["address"] ? Icon(Icons.check_circle) : null,
                  onTap: () {
                    setState(() {
                      _selectedAddress = d["address"];
                    });
                  },
                )
              )],
            ),
          ),
        ),
        bottomNavigationBar: Padding(
          padding: const EdgeInsets.all(16),
          child: ElevatedButton(onPressed: () async {
            if(_selectedAddress == null) return;
            bool? connResult = await _bluetoothPrinterPlugin.connect(_selectedAddress!);
            if(connResult == true) {
              await _bluetoothPrinterPlugin.write(
                "\x1BM\x00"
                "\x1Ba0Fish Market Banyuwangi\n"
                "\x1Ba1Jl. Bengawan No. 20\n"
                "\x1Ba2HP/WA. 082143255597\n"
              );
            }
          }, child: Text("Write to Selected Device")),
        ),
      ),
    );
  }
}