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27 Flutter: appBar

import 'package:flutter/material.dart';
import 'dart:async';
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>{
int _value = 0;
void _add() => setState(() => _value++);
void _remove() => setState(() => _value--);
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Name here'),
backgroundColor: Colors.red,
actions: <Widget>[
new IconButton(icon: new Icon(Icons.add), onPressed: _add),
new IconButton(icon: new Icon(Icons.remove), onPressed: _remove)
//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(_value.toString(), style: new TextStyle(fontWeight: FontWeight.bold, fontSize: 37.0),)