main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyAppOne(),
    );
  }
}

class MyAppOne extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyAppOne> {
  @override
  void initState() {
    super.initState();
    _fetchThings();
  }

  void _fetchThings() async {
    await Future.delayed(Duration(seconds: 10));
    print("HI");
  }

  @override
  Widget build(BuildContext context) {
    return Center(child: CircularProgressIndicator());
  }
}