How to print() to logs in the release mode in Flutter?

user_10927806 0
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My web app has a problem that only manifests in profile and release builds (a widget is not rendering properly, producing only gray). I want to add some print() statements to help figure out what the problem is, but print() doesn't log anything to VSCode debug output window in profile/release builds.

Any ideas how to fix that?

What other techniques can I use to diagnose release-only problems?

Thx

flutter release logging debugging
1 Answers

There are several ways of doing it:

  1. Use the following command

    flutter logs

  2. Use logger package.

    The default implementation (DevelopmentFilter) shows all logs with level >= Logger.level while in debug mode. In release mode all logs are omitted.

    In order to show all logs even in release mode, create your own LogFilter like this:

    class MyFilter extends LogFilter {
  @override
  bool shouldLog(LogEvent event) {
    return true;
  }
}

    Usage:

    void foo() {
  var logger = Logger(filter: MyFilter());
  logger.d('message');
}

  3. Use print statement (not sure if this works on web)

user_66186220
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