Flutter hot reloading is not working to display changes - flutter

Question

I have two files, main.dart and sections.dart.
I have defined a few widgets in section.dart and used them in main.dart file, when I run flutter run command changes are displayed on screen, but when I press R to hot reload, nothing changes on screen.
main.dart:
import 'package:flutter/material.dart';
import 'sections.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Share IDEASS',
home: Scaffold(
appBar: AppBar(
title: Text('IDEASs'),
),
body: ListView(
children: [
labelsSection,
],
),
),
);
}
}
Sections.dart:
import 'package:flutter/material.dart';
class MyApp extends StatelessWidget {
Widget build(BuildContext context) {
return MaterialApp(
title: 'Share IDEAS',
);
}
}
Column labelSectionMethod(color,IconData icon, String label,String numbers){
return Column(
children: <Widget>[
Icon(icon, color:color),
Container(
child: Text(label,
style: TextStyle(color: color
),
),
),
Container(
child:Text(numbers,
style:TextStyle(color:color
),
),
),
],
);
}
Widget labelsSection=Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
labelSectionMethod(Colors.red,Icons.supervised_user_circle,"IDEASS","35"),
labelSectionMethod(Colors.red,Icons.favorite,"LIKE","22"),
labelSectionMethod(Colors.red,Icons.data_usage,"STREAK","12"),
],
),
);
Maybe because I am repeating:
return MaterialApp(
title: 'Share IDEAS',
);
in sections.dart, or something to do with main function.
UPDATE:
i moved content of sections.dart file in main.dart file still hot reload is not working.

Answer 1

After moving a file to another directory, Android Studio changed my imports to absolute paths.
import 'file:///C:/Users/svenv/AndroidStudioProjects/sample_screen_collection/lib/welcome/reading_list_card.dart';
i had to change it to this
import 'package:samplescreencollection/components/reading_list_card.dart';

Answer 2

This usually happens when you have change a lot of code, added states, changed a widget from stateless to state full, etc. Preforming a hot restart (ctrl +F5) will fix this issue.
If this seems to not work still, try removing the app from your phone/simulator/emulator (closing the app, and deleting it) and running debug/flutter run again. This should fix your issue

Answer 3

There have been issue reported to Flutter regarding this,https://github.com/flutter/flutter/issues/17155#issue-319238844
Basically it's like Flutter is not properly identifying the changes in order to generate updated build files (my personal understanding):
Solution
Simple solution is Clean the project and rebuild it.
I'm using Android studio Android Studio 3.6, Following steps illustrate how to clean the flutter project
Navigate to Tools in navigationbar
Select Flutter > Flutter Clean
Finally Run the Project again by clicking the green playicon

Answer 4

Sometimes flutter gets confused with large amounts of changes, and you need to perform a restart, especially when interacting with the entire App or main function.
You can pressCtrl+C to kill the flutter run process, and try launching it again. Additionally, if you run Flutter through IntelliJ or Android Studio, the flutter plugin includes a "Hot Restart" feature which accomplishes the same thing.

Answer 5

My situation was - Flutter would neither hot reload nor stop on a break-point nor even provide fresh builds to Android emulator, whereas iOS was fine.
I tried suggestions from above but nothing really worked, spent a day on these things.I upgraded from Android Studio 3.x to 4.1 and nothing changed.
What worked for me was:
Create a totally new Flutter sample project.
Validate it works - new versions are deployed, debugging and hot reloads work
Transfer my project into this new project. This pretty much involved replace of the lib and .git folders and manual updates of pubspec.yaml, AndroidManifest.xml and Info.plist (manual file updates took most of the effort, but still much less time than my several day attempts to make things work again)
Verify everything works.