isolate 通信

main.dart

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import 'package:flutter/material.dart'; import 'package:flutter_isolate/flutter_isolate.dart'; import 'isolates.dart'; import 'dbhelper.dart'; import 'package:rxdart/rxdart.dart'; import 'dart:isolate';     void main() {   runApp(MaterialApp(     title: 'Flutter Demo',     initialRoute: '/',     routes: {       '/':(context)=>MyApp(),       '/second':(context)=>NextPage(),     },   )); }   class MyApp extends StatefulWidget{   @override   State<StatefulWidget> createState() {     return MyAppState();   } } class MyAppState extends State<MyApp> {   FlutterIsolate isoltex;   DataBloc bloc = DataBloc();   ReceivePort toChild;   DB db = DB();     addData()async{     var a = await db.addData('type', {'name':'11maintest'});     print(a);   }     checkData()async{     var b = await db.queryData('SELECT * FROM type');     print(b);   }   @override   Widget build(BuildContext context) {       return Scaffold(       appBar: AppBar(title: Text('sss'),),       body: Container(child: Column(           children: <Widget>[             StreamBuilder(               stream: bloc.dataBloc.stream,               builder: (context, snapshot){                 if(snapshot.hasData){                   return Text('${snapshot.data}');                 }else{                   return Text('pending..');                 }               },             ),             RaisedButton(child: Text('addData'),onPressed: ()async{               addData();             },),             RaisedButton(child: Text('check data'),onPressed: ()async{               checkData();             },),             RaisedButton(child: Text('start'),onPressed: ()async{               isoltex = await createIsolate(bloc,'abc');             },),             RaisedButton(child: Text('pause'),onPressed: (){               isoltex.pause();             },),             RaisedButton(child: Text('resume'),onPressed: (){               isoltex.resume();             },),             RaisedButton(child: Text('kill'),onPressed: (){               isoltex.kill();             },),             RaisedButton(child: Text('go to next'),onPressed: (){               Navigator.of(context).pushNamed('/second');             },)             ]),       ),     );   } }     class NextPage extends StatelessWidget{   @override   Widget build(BuildContext context) {     return Scaffold(       appBar: AppBar(title: Text('page2'),),       body: Container(         child: RaisedButton(child:Text('btn'),             onPressed: (){               print('hello');             }),       ),     );   } }   class DataBloc {   ReplaySubject dataBloc = ReplaySubject();   }

　　

isolates.dart

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import 'package:flutter_isolate/flutter_isolate.dart'; import 'dart:async'; import 'dart:isolate'; import 'main.dart';   Future<FlutterIsolate> createIsolate(DataBloc bloc, String type) async {   ReceivePort receivePort = ReceivePort();   ReceivePort fromChild = ReceivePort();   FlutterIsolate isolate = await FlutterIsolate.spawn(isolateEntry, receivePort.sendPort);   SendPort t = await receivePort.first;   t.send({'sender':fromChild.sendPort,'msg':type});   fromChild.listen((value){     bloc.dataBloc.add(value);   });   return isolate; }     isolateEntry(SendPort sendPort)async{   ReceivePort port = ReceivePort();   sendPort.send(port.sendPort);     port.listen((data)async{     print('son $data');     await doWork(data['msg'], data['sender']);   }); }   Future doWork(data, SendPort s)async{   print('start working');   int i = 0;   while(i<10){     s.send('$data : $i');     await Future.delayed(Duration(seconds: 1));     i++;   } }