HomeScreen.txt

import 'dart:ffi';

import 'package:flutter/material.dart';

void main(){

  runApp(MyApp());
}

class MyApp extends StatefulWidget{
  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String placeholder = "";
  int i = 0;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Flutter App',
        debugShowCheckedModeBanner: false,
        home: Scaffold(
          body: Center(
            child: Text("Button $placeholder $i"),
          ),
          appBar: AppBar(

            title: Text("VJ Flutter App"),

            centerTitle: true,
          ),
          floatingActionButton: FloatingActionButton(
              child: Icon(Icons.add_circle_outline),
              onPressed: () {
                setState(() {
                  i += 2;
                  placeholder = "Clicked";
                });
              }),
        )
    );
  }
}