main.dart
import 'package:flutter/material.dart';
​
void main(){
runApp(new MaterialApp(
home: new MyApp(),
));
}
​
class MyApp extends StatefulWidget {
@override
_State createState() => new _State();
}
​
class _State extends State<MyApp>{
​
final GlobalKey<ScaffoldState> _scaffoldstate = new GlobalKey<ScaffoldState>();
​
void _showBar(){
_scaffoldstate.currentState.showSnackBar(new SnackBar(content: new Text('Hello World')));
}
​
@override
Widget build(BuildContext context) {
return new Scaffold(
key: _scaffoldstate,
appBar: new AppBar(
title: new Text('Name here'),
backgroundColor: Colors.red,
),
body: new Container(
padding: new EdgeInsets.all(32.0),
child: new Center(
child: new Column(
children: <Widget>[
new Text('Add widgets here'),
new RaisedButton(onPressed: _showBar, child: new Text('Click me'),)
],
),
),
),
);
}
}