What is the difference between runApp(new MyApp()) and runApp(new MaterialApp()) in flutter?

Question

In flutter we can pass a stateless widget that returns a MaterialApp instance to the runApp() function like this:

void main()=>r         


        

Answer 1

There's no difference in visual behavior. What changes is how hot reload behaves.

For example if you used runApp(MaterialApp()), changing from

runApp(MaterialApp(title: 'Foo'))

to

runApp(MaterialApp(title: 'Bar'))

then the hot reload wouldn't take changes into consideration.

While if you had the following class :

class MyApp {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Foo',
    );
  )
}

and used it like this :

runApp(MyApp())

then changing title of MyApp would be correctly hot reloaded.