Default Flutter App Setup

home.dart

import 'package:flutter/material.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => new _HomePageState();
}

class _HomePageState extends State<HomePage> {
  
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
  }
  
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("AppBar Title"),
      ),
      body: new FlutterLogo(size: 200.0),
    );
  }
}

main.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
        theme: new ThemeData(primarySwatch: Colors.blue),
        debugShowCheckedModeBanner: false,
        title: 'Recent App Title',
        home: new HomePage());
  }
}