Flutter Hot Reload in Android Studio

Question

I firstly wondered how to perform a hot reload in Flutter with Android Studio. Since I am already so used to the auto-save of Android Studio I did not even consider CTRL + S for the hot reload.

I then assigned the Flutter Hot Reload in the Keymap and this worked really well. But now I just realised that CTRL + S does also perform the hot reload. I looked the shortcut up in the Keymap and discovered that CTRL + S is mapped to Save All.

Now I am wondering what does Save All even do and does it do any extra compared to my assigned Flutter Hot Reload key combination? I do not get the reason for Save All when Android Studio already saves everything automatically.

Solution 1

Conclusion

It really does matter. Apparrently the Flutter plugin simply reacts to a Save All call by executing Apply Changes, which will always call Flutter Hot Reload.

An interesting observation I made is that Flutter Hot Reload will not (as of writing) hot reload the application when there was no change in code, but Save All will and Apply Changes as well, which is why I wrote that Save All calls Apply Changes.

Solution 2

ctrl+s is to save and when "Perform hot reload on save" is enabled also "hot reload"

Solution 3

Write flutter run into the terminal present at below in android studio. Once the app runs into your device or emulator press r into the terminal ->This will hot reload your app [for eg:- make some minor changes into your app after executing the flutter run then press r you can notice HOT RELOAD FUNCTIONALITY

Solution 4

In my scenario I was writing the code from scratch and not following the coding std. Until then it was problem in Hot reload when I start working on

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

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Comments

[creativecreatorormaybenot]

Thank you for that. But why does it then not hot reload when automatic synchronization is enabled?

[Günter Zöchbauer]

I'm confused. Your original question dors not seem to contain anything about hot reload not working.

[creativecreatorormaybenot]

I mean, why does it not automatically hot reload. Android Studio automatically saves the files. This was not in the oq.

[Günter Zöchbauer]

I think I understand the question now. It does hot reload by default when you save. Do you get any console output in the debug view in AS?

[creativecreatorormaybenot]

No. Sorry for confusing you. I have no problem at all. I am just wondering why the Save All function triggers a hot reload, but not automatically because files are saved without pressing <kbd>CTRL</kbd> + <kbd>S</kbd>.

[Günter Zöchbauer]

So "Save All" triggers hot release but Ctrl+s does not?

[creativecreatorormaybenot]

CTRL + S triggers the Save All function. I think this question of me was senseless. Android Studio saves files automatically so you will never use CTRL + S outside of Flutter and I was wondering why it does not trigger hot reload on auto save, but that is not a good question.

[Nikhil Soni]

For which translation tool are you talking?

[Sisir]

For all those who have issues with Hot Reload on Android Studio 3.5 check this: github.com/flutter/flutter/wiki/…