scan_plugin 0.0.2

A new Flutter project.

example/lib/main.dart

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

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

void main() => runApp(const MyApp());

// 发布使用
// flutter packages pub publish --server=https://pub.dartlang.org
// 即可
class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  StreamSubscription? _streamSubscription;
  String? _appTestResult;

  static const EventChannel _eventChannel =
      EventChannel('com.example.scan/event_channel_event');

  void _enableEventReceiver() {
    // 这里的 data 就是原生端发送过来的数据
    _streamSubscription =
        _eventChannel.receiveBroadcastStream().listen((dynamic event) {
      setState(() {
        _appTestResult = event;
      });
    }, onError: (dynamic error) {}, cancelOnError: true);
  }

  void _disableEventReceiver() {
    if (_streamSubscription != null) {
      _streamSubscription?.cancel();
      _streamSubscription = null;
    }
  }

  @override
  void initState() {
    super.initState();
    getResult();
    _enableEventReceiver();
  }

  @override
  void dispose() {
    super.dispose();
    _disableEventReceiver();
  }

  Future<void> getResult() async {
    String appTestResult;
    appTestResult = await Scan.getResult;
    setState(() {
      _appTestResult = appTestResult;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          //child: Text('Running on: $_platformVersion\n'),
          child: Text('Result =  $_appTestResult\n'),
        ),
      ),
    );
  }
}