CODEWITHSUNDEEP
androiddebuggingflutter
Jack621311
Jack621311

Reputation: 127

How to print to log in Flutter?

I wanted to print a log statement onto any LogCat console (Verbose, Debug, etc) but I can't seem to find a way to do it.

The print() or debugPrint() doesn't seem to work, or better yet should I say I don't know where they are printing.

Also, for some reason, the LogCat console is saying "No connected devices" and "No debuggable process" even though I have the emulator running in background and the files are executing on the emulator perfectly.

Upvotes: 4

Views: 11378

Answers (1)

Sampath
Sampath

Reputation: 1202

Based on Flutter Doc, the logging view displays events from the Dart runtime, application frameworks (like Flutter), and application-level logging events.By default, the logging view shows:

  • Garbage collection events from the Dart runtime
  • Flutter framework events, like frame creation events
  • stdout and stderr from applications
  • Custom logging events from applications

Refer the Debugging Flutter Applications Programmatically Doc. You can use:

stderr.writeln('print me');

Or

import 'dart:developer' as developer;

void main() {
  developer.log('log me', name: 'my.app.category');

  developer.log('log me 1', name: 'my.other.category');
  developer.log('log me 2', name: 'my.other.category');
}

Or

import 'dart:convert';
import 'dart:developer' as developer;

void main() {
  var myCustomObject = ...;

  developer.log(
    'log me',
    name: 'my.app.category',
    error: jsonEncode(myCustomObject),
  );
}

to log from your app.

Upvotes: 8

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