Flutter隔离执行插件isolate_flutter的使用

IsolateFlutter

IsolateFlutter 是一个用于创建和管理 Isolate 的实用包。它基于 dart:isolate，因此仅支持 iOS 和 Android。

它类似于 compute()：创建一个 isolate，在该 isolate 上运行回调函数，并传递消息，最终返回回调函数的值。但是它不是顶层常量，因此你可以同时创建多个 Isolate。

使用方法

创建并启动一个 Isolate

final _value = await IsolateFlutter.createAndStart(_testFunction, 'Hello World');
print(_value);

创建并管理一个 Isolate（不立即运行）

1. 创建一个 Isolate

   IsolateFlutter _isolateFlutter = await IsolateFlutter.create(_testFunction, 'Hello World');
   

2. 启动并获取 _testFunction 返回的值

   final _value = await _isolateFlutter.start();
   print(_value);
   

3. 暂停正在运行的 Isolate

   _isolateFlutter.pause();
   

4. 恢复已暂停的 Isolate

   _isolateFlutter.resume();
   

5. 停止并释放一个 Isolate

   _isolateFlutter.stop();
   

示例测试函数

static Future<String> _testFunction(String message) async {
  Timer.periodic(Duration(seconds: 1), (timer) => print('$message - ${timer.tick}'));
  await Future.delayed(Duration(seconds: 30));
  return '_testFunction finish';
}

完整示例 Demo

下面是一个完整的示例应用，展示了如何在 Flutter 应用中使用 IsolateFlutter 包。

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'IsolateFlutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'IsolateFlutter Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  MyHomePage({Key? key, required this.title}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  IsolateFlutter? _isolateFlutter;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextButton.icon(
              label: Text('Create'),
              icon: Icon(Icons.create),
              onPressed: _onCreate,
            ),
            TextButton.icon(
              label: Text('Start'),
              icon: Icon(Icons.play_arrow),
              onPressed: _onStart,
            ),
            TextButton.icon(
              label: Text('Pause'),
              icon: Icon(Icons.pause),
              onPressed: _onPause,
            ),
            TextButton.icon(
              label: Text('Resume'),
              icon: Icon(Icons.play_arrow),
              onPressed: _onResume,
            ),
            TextButton.icon(
              label: Text('Stop'),
              icon: Icon(Icons.stop),
              onPressed: _onStop,
            ),
            Text('--- OR ---'),
            TextButton.icon(
              label: Text('Create and start'),
              icon: Icon(Icons.playlist_play),
              onPressed: _onCreateAndStart,
            ),
          ],
        ),
      ),
    );
  }

  void _onCreate() async {
    print('Create Isolate');
    _isolateFlutter = await IsolateFlutter.create(_testFunction, 'Hello World');
  }

  void _onStart() async {
    print('Start Isolate');
    final _value = await _isolateFlutter?.start();
    print(_value);
  }

  void _onPause() {
    print('Pause Isolate');
    _isolateFlutter?.pause();
  }

  void _onResume() {
    print('Resume Isolate');
    _isolateFlutter?.resume();
  }

  void _onStop() {
    print('Stop Isolate');
    _isolateFlutter?.stop();
  }

  void _onCreateAndStart() async {
    print('Create And Start Isolate');
    final _value = await IsolateFlutter.createAndStart(_testFunction, 'Hello World');
    print(_value);
  }

  static Future<String> _testFunction(String message) async {
    Timer.periodic(Duration(seconds: 1), (timer) => print('$message - ${timer.tick}'));
    await Future.delayed(Duration(seconds: 30));
    return '_testFunction finish';
  }
}

作者

IsolateFlutter 是由 Thong Dang 开发的。你可以通过电子邮件 thongdn.it@gmail.com 联系他。

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感谢你的支持！❤️