test1.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(home: Screen()));
}

class Screen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          ElevatedButton(
              onPressed: () {
                Future.delayed(Duration(seconds: 3), () {
                  print('Task finished');
                });
              },
              child: Text('Like')),
          ElevatedButton(
              onPressed: () => print('Back Pressed'), child: Text('Back')),
        ],
      ),
    );
  }
}