Flutter Lecture Code

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  var stateVar;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("My App"),
        ),
        body: Column(children: <Widget>[
          Text("Hello World!"),
          Text("Second Text"),
          MyButtonWidget(),


        ],),
      ),
    );
  }
// This widget is the root of your application.

}
class MyButtonWidget extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return MyButtonState();
  }
}

// the state
class MyButtonState extends State {
  var _clicksDone = 0;
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      child: Text("Clicked $_clicksDone times"),
      onPressed: () {
        setState(() =>_clicksDone++);
        print("Pressed $_clicksDone times");
      },
    );
  }
}