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33 Flutter: Using SnackBar

import 'package:flutter/material.dart';
void main(){
runApp(new MaterialApp(
home: new MyApp(),
class MyApp extends StatefulWidget {
_State createState() => new _State();
//State is information of the application that can change over time or when some actions are taken.
class _State extends State<MyApp>{
final GlobalKey<ScaffoldState> _scaffoldstate = new GlobalKey<ScaffoldState>();
void _showBar(){
_scaffoldstate.currentState.showSnackBar(new SnackBar(content: new Text('Hello World')));
Widget build(BuildContext context) {
return new Scaffold(
/*a key is a way of refrencing an actual widget, below we are making refrence
of an object we created, it will be accessible across the entire application since
we are creating a GlobalKey*/
key: _scaffoldstate,
appBar: new AppBar(
title: new Text('Name here'),
backgroundColor: Colors.red,
//hit Ctrl+space in intellij to know what are the options you can use in flutter widgets
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'),)