28 Flutter: Floating Action Button

main.dart

import 'package:flutter/material.dart';
import 'dart:async';

void main(){
  runApp(new MaterialApp(
    home: new MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _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>{

  String _value = '';
  void _onClicked() => setState(() => _value = new DateTime.now().toString());

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Name here'),
        backgroundColor: Colors.red,
      ),
      floatingActionButton: new FloatingActionButton(
          onPressed: _onClicked,
          backgroundColor: Colors.red,
          //if you set mini to true then it will make your floating button small
          mini: false,
          child: new Icon(Icons.timer),
      ),
      //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)
            ],
          ),
        ),
      ),
    );
  }
}