Hot reload vs hot restart in Android Studio with Flutter - android-studio

Question

I'm testing my Flutter starter app on virtual as well as physical device. The problem is that the app doesn't update on the screen while hot-reloading (this is configured to work at every file-save), but only on hot-restart. On the screenshot this corresponds to the right button, not the left.
Is it normal or is something wrong?
Just in case, this is the contents of my main.dart file:
import 'package:flutter/material.dart';
void main() {
runApp(
MaterialApp(
home: Scaffold(
backgroundColor: Colors.blueGrey,
appBar: AppBar(
title: Center(
child: Text('Hi Everybody!'),
),
backgroundColor: Colors.blueGrey[900],
),
body: Center(
child: Image(
image: AssetImage(
'images/diamond.png',
),
),
),
),
),
);
}

Answer 1

You are writing everything inside main function. so hot reload is not working.
They mentioned this in Flutter Documentaion
As a general rule, if the modified code is downstream of the root
widget’s build method, then hot reload behaves as expected. However,
if the modified code won’t be re-executed as a result of rebuilding
the widget tree, then you won’t see its effects after hot reload.
so you need to write your code below root widget.
Write code like this:
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
backgroundColor: Colors.blueGrey,
appBar: AppBar(
title: Center(
child: Text('Hi Everybody!'),
),
backgroundColor: Colors.blueGrey[900],
),
body: Center(
child: Image(
image: AssetImage(
'images/diamond.png',
),
),
),
),
);
}
}