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@ricardobrg
Created August 7, 2018 06:58
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Flutter app exit error
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or press Run > Flutter Hot Reload in IntelliJ). Notice that the
// counter didn't reset back to zero; the application is not restarted.
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return new Scaffold(
appBar: new AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: new Text(widget.title),
),
body: new CupertinoTabScaffold(
tabBar: new CupertinoTabBar(
items: <BottomNavigationBarItem> [
new BottomNavigationBarItem(
backgroundColor: Colors.white,
icon: new Icon(Icons.tab),
title: new Text("tab1")
),
new BottomNavigationBarItem(
backgroundColor: Colors.white,
icon: new Icon(Icons.tab),
title: new Text("tab2")
),new BottomNavigationBarItem(
backgroundColor: Colors.white,
icon: new Icon(Icons.tab),
title: new Text("tab3")
),
],
),
tabBuilder: (BuildContext context, int index) {
if (index == 2){
()=>exit(0);
}else{
return new CupertinoTabView(
builder: (BuildContext context) {
return new CupertinoPageScaffold(
navigationBar: new CupertinoNavigationBar(
middle: new Text('Page 1 of tab $index'),
),
child: new Center(
child: new CupertinoButton(
child: const Text('Next page'),
onPressed: () {
Navigator.of(context).push(
new CupertinoPageRoute<Null>(
builder: (BuildContext context) {
return new CupertinoPageScaffold(
navigationBar: new CupertinoNavigationBar(
middle: new Text('Page 2 of tab $index'),
),
child: new Center(
child: new CupertinoButton(
child: const Text('Back'),
onPressed: () { Navigator.of(context).pop(); },
),
),
);
},
),
);
},
),
),
);
},
);
}
},
)
);
}
}
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