bluetooth_print_plus 1.2.0

BluetoothPrint is a bluetooth plugin to help developers build bluetooth thermal printer apps for both iOS and Android..

example/lib/main.dart

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

import 'package:bluetooth_print_plus/bluetooth_print_plus.dart';

import 'function_page.dart';

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

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

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return const MaterialApp(
      home: HomePage(),
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with  WidgetsBindingObserver {
  final _bluetoothPrintPlus = BluetoothPrintPlus.instance;
  bool _connected = false;
  BluetoothDevice? _device;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) => initBluetooth());
    // _bluetoothPrintPlusPlugin.disconnect();
  }

  Future<void> initBluetooth() async {
    bool isConnected = await _bluetoothPrintPlus.isConnected ?? false;
    _bluetoothPrintPlus.state.listen((state) {
      print('******************* cur device status: $state');
      switch (state) {
        case BluetoothPrintPlus.CONNECTED:
          setState(() {
            _connected = true;
            // tips = 'connect success';
            if (_device == null) return;
            Navigator.of(context).push(
              MaterialPageRoute(
                builder: (ctx) {
                  return FunctionPage(_device!);
                }
            ));
          });
          break;
        case BluetoothPrintPlus.DISCONNECTED:
          setState(() {
            _connected = false;
            // tips = 'disconnect success';
          });
          break;
        default:
          break;
      }
    });

    if (!mounted) return;

    if(isConnected) {
      setState(() {
        _connected = true;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Plugin example app'),
      ),
      body: SafeArea(
        child: Column(
          children: [
            Expanded(
                child: StreamBuilder<List<BluetoothDevice>>(
                  stream: _bluetoothPrintPlus.scanResults,
                  initialData: [],
                  builder: (c, snapshot) => ListView(
                    children: snapshot.data!.map((d) => Container(
                      padding: const EdgeInsets.only(left: 10, right: 10, bottom: 5),
                      child: Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: [
                              Expanded(
                                  child: Column(
                                    crossAxisAlignment: CrossAxisAlignment.start,
                                    children: [
                                      Text(d.name ?? ''),
                                      Text(
                                        d.address ?? 'null',
                                        overflow: TextOverflow.ellipsis,
                                        style: const TextStyle(
                                            fontSize: 12,
                                            color: Colors.grey
                                        ),
                                      ),
                                      const Divider(),
                                    ],
                                  )
                              ),
                              const SizedBox(width: 10,),
                              ElevatedButton(
                                  onPressed: () async {
                                      _bluetoothPrintPlus.stopScan();
                                      _bluetoothPrintPlus.connect(d);
                                      _device = d;
                                  },
                                  child: const Text("connect"),
                              )
                            ],
                          ),
                    )).toList(),
                  ),
                )
            ),
            Container(
              padding: const EdgeInsets.symmetric(vertical: 10, horizontal: 20),
              width: double.infinity,
              height: 60,
              child: ElevatedButton(
                child: const Text(
                  "Search",
                  style: TextStyle(fontSize: 16)
                ),
                onPressed: () {
                  _bluetoothPrintPlus.isAvailable;
                  _bluetoothPrintPlus.startScan(timeout: const Duration(seconds: 30));
                },
              ),
            )
          ],
        ),
      ),
    );
  }
}