How to disable all Logs [debugPrint()] in release build in flutter?

Question

I have installed a release build apk in the android device but if I connect that device to Android studio then I am able to see all Logs/debugPrint statements.

Is there any way to disable the all the logs ?

Sebastian · Answer 1 · 2022-02-28T11:50:04.040

14

I combined the accepted answer with the idea from here and used it main.dart to silence all debugPrint everywhere.

const bool isProduction = bool.fromEnvironment('dart.vm.product');
void main() {
  if (isProduction) {      
      // analyser does not like empty function body
      // debugPrint = (String message, {int wrapWidth}) {};
      // so i changed it to this:
      debugPrint = (String? message, {int? wrapWidth}) => null;

  } 
  runApp(
    MyApp()
  );
}

edited Feb 28 '22 at 11:50

answered Mar 13 '20 at 13:41

Sebastian

966
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19

The link you have given is not working. Getting page not found error. – K Pradeep Kumar Reddy Jun 26 '20 at 20:44
i fixed the link. no idea what went wrong before :( – Sebastian Jun 29 '20 at 08:15
1

@Sebastian I think you always check the bool kDebugMode/kReleaseMode which is a constant provided by Flutter's foundation. – mortred95 Dec 16 '20 at 15:09
will compiler remove all calls for function which does nothing? – bounxye Aug 09 '21 at 23:35
I know nothing about that, but it is mentioned here that it does: https://stackoverflow.com/questions/53256139/performance-of-empty-function-on-dart – Sebastian Aug 10 '21 at 05:59

score 6 · Answer 2 · answered Mar 25 '18 at 13:32

6

You can assign a dummy function to the global debugPrint variable:

import 'package:flutter/material.dart';

main() {
  debugPrint = (String message, {int wrapWidth}) {};
}

answered Mar 25 '18 at 13:32

Günter Zöchbauer

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And how could I check the build variant so that I can do it only when I compile for production? I don't like this solution: https://stackoverflow.com/questions/47438564/how-do-i-build-different-versions-of-my-flutter-app-for-qa-dev-prod and I don't wanna use package like simple_preprocessor. – shadowsheep Mar 25 '18 at 17:04
I think the linked SO question us the way to go. You can also create a build script that modifies a source file before it calls `flutter build ...` – Günter Zöchbauer Mar 25 '18 at 17:09
Dunno, but thanks. I’ll look forward this custom build script way. If you already have some links they’ll be appreciated ;) – shadowsheep Mar 25 '18 at 17:16
You can use a simple shell script or a bash script. I have a project where I copy a different Dart file that contains some config values that are imported somewhere into place before building. This way I don't need to modify a files content – Günter Zöchbauer Mar 25 '18 at 17:20
I’ll do some further research about this topic. Maybe I’ll post a specific question. For now upvoted your answer! ;) – shadowsheep Mar 25 '18 at 17:29

score 0 · Answer 3 · answered Jun 26 '22 at 00:14

With latest Flutter versions returning empty function does not work. Returning null is not recommended and should be avoided - if used, it is marked with tag that void functions should not have null return. Instead empty string will not cause any issue and works perfectly:

main() {
  debugPrint = (String? message, {int? wrapWidth}) => '';
}

How to disable all Logs [debugPrint()] in release build in flutter?

3 Answers3