How do I get main.dart.testing page back? I think that's what it was called? - flutter

Question

At first my problem was that MyApp isn't defined and then I deleted the page that was for testing(?)... Now my problem is - A build function returned null. Offending widget is MyApp.
How do I get that page back? Do you have the code for it?
Here's the code I'm trying to run on an ios simulator, it's not right but it used to be white, now it has a red screen with that text
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
MaterialApp(
home: Scaffold(
body: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [Color(0x50658C), Color(0x2D4067)],
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
),
),
),
),
);
}
}
I'm very new at this

Answer 1

This error happens because you missed a return. In your case you forgot to return the MaterialApp.
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
// Missing return
return MaterialApp(
...
);
}
}

Answer 2

Write below code in main.dart:
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
final appTitle = 'Drawer Demo';
#override
Widget build(BuildContext context) {
return MaterialApp(title: appTitle, theme: ThemeData.light(),
home: LoginScreen(), // Do not specify Home when specifying routes.
);
}
}
class LoginScreen extends StatefulWidget {
#override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
child: Text('Done'),
),
);
}
}
And run project....