flutter isolate demo

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main.dart

import 'package:flutter/material.dart';

import 'package:flutter_isolate/flutter_isolate.dart';

import 'isolates.dart';

import 'dbhelper.dart';

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;

  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>[

            RaisedButton(child: Text('addData'),onPressed: ()async{

              addData();

            },),

            RaisedButton(child: Text('check data'),onPressed: ()async{

              checkData();

            },),

            RaisedButton(child: Text('start'),onPressed: ()async{

              isoltex = await createIsolate();

            },),

            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');

        }),

      ),

    );

  }

}

isolates.dart

import 'dbhelper.dart';

import 'package:flutter_isolate/flutter_isolate.dart';

import 'dart:async';

import 'dart:isolate';

Future<FlutterIsolate> createIsolate() async {

  ReceivePort receivePort = ReceivePort();

  FlutterIsolate isolate = await FlutterIsolate.spawn(

    isolateEntry,

    receivePort.sendPort,

  );

  receivePort.listen((value){

    print('from spawrn side: $value');

  });

  return isolate;

}

isolateEntry(SendPort sendPort)async{

  DB db = DB();

  int i=0;

  while (i<40){

    var d = await db.addData('type', {'name':'$i'});

    i++;

    sendPort.send('ok $d');

    await Future.delayed(Duration(seconds: 1));

  }

}