urovo_scanner_plus 0.0.1

A Flutter plugin for Urovo barcode scanner Android

example/lib/main.dart

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

import 'package:flutter/services.dart';
import 'package:urovo_scanner_plus/urovo_scanner_plus.dart';

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

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

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

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  String _initScannerResult = 'Not initialized';
  String _openScannerResult = 'Not opened';
  String _stopScannerResult = 'Not stopped';
  final _urovoScannerPlusPlugin = UrovoScannerPlus();

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

  // 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 _urovoScannerPlusPlugin.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;
    });
  }

  Future<void> _initScanner() async {
    String result;
    try {
      result =
          await _urovoScannerPlusPlugin.initScanner() ??
          'Failed to initialize scanner';
    } on PlatformException {
      result = 'Error initializing scanner';
    }

    if (!mounted) return;

    setState(() {
      _initScannerResult = result;
    });
  }

  Future<void> _openScanner() async {
    String result;
    try {
      result =
          await _urovoScannerPlusPlugin.openScanner() ??
          'Failed to open scanner';
    } on PlatformException {
      result = 'Error opening scanner';
    }

    if (!mounted) return;

    setState(() {
      _openScannerResult = result;
    });
  }

  Future<void> _stopScanner() async {
    String result;
    try {
      result =
          await _urovoScannerPlusPlugin.stopScanner() ??
          'Failed to stop scanner';
    } on PlatformException {
      result = 'Error stopping scanner';
    }

    if (!mounted) return;

    setState(() {
      _stopScannerResult = result;
    });
  }

  void listenToScanner() {
    const eventChannel = EventChannel('urovo_scanner_plus/event');

    eventChannel.receiveBroadcastStream().listen(
      (dynamic data) {
        print('scan result: $data');
        // data 是 String 类型（根据 Kotlin 中发送的内容）
      },
      onError: (Object error) {
        print('scan error: $error');
      },
    );
  }

  @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'),
              Text('Scanner status: $_initScannerResult\n'),
              Text('Open result: $_openScannerResult\n'),
              Text('Stop result: $_stopScannerResult\n'),
              ElevatedButton(
                onPressed: _initScanner,
                child: const Text('Initialize Scanner'),
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: _openScanner,
                child: const Text('Open Scanner'),
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: _stopScanner,
                child: const Text('Stop Scanner'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}