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)); } }
another https://blog.csdn.net/PD_Wang/article/details/80165265