k2_printer 0.0.8

Thermal Printer utility for both Sunmi K2 and K2 Mini.

example/lib/main.dart

import 'dart:async';
import 'dart:developer';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:k2_printer/k2_printer.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(const MyApp());
}

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

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

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _k2PrinterPlugin = K2Printer();
  StreamSubscription<PrintResult>? printResultSub;

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

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion = await _k2PrinterPlugin.getPlatformVersion() ?? 'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  void print() {
    try {
      const text =
          "First Line\nSecond Line\nThird Line\nFourth Line\nFifth Line\nSixth Line\nSeventh Line\nEighth Line\n";
      final printerCommands = [
        PrintText(text: text),
        CutPaper(mode: CutPaperMode.fullCut, paperFeed: 5),
      ];
      Document document = Document(id: "document-01", printerCommands: printerCommands);
      _k2PrinterPlugin.print(document);
    } catch (err) {
      log("Error: $err");
    }
  }

  Future<void> getPrinterType() async {
    final printerType = await _k2PrinterPlugin.getType();
    log(printerType.toString());
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text('Running on: $_platformVersion\n'),
              ElevatedButton(
                onPressed: print,
                child: const Text("Test Print"),
              ),
              ElevatedButton(
                onPressed: getPrinterType,
                child: const Text("Get Printer Type"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}