how to print log in flutter

Hi Guys, Welcome to Proto Coders Point, In this flutter article let’s learn how to log long string in flutter, How to fix pring statement in flutter that only pring 1020 character & trancate the remaining string & leaves this symbol at end <..>.

Basically, The current version of dart language does not support printing logs that has more then 1020 character, instead print() statement in flutter will only print 1020 character & trancate remaining.

How to log in flutter - Flutter Log...
How to log in flutter - Flutter Logger library

Check below screenshot

flutter prints only half data on console
flutter prints only half data on console

So, Here is a solution on How to Prin full long string/list without missing any data while debugging in flutter.

Print Long String in console While developing flutter app

Here is the right way to print logs message or data on console for debugging your flutter application.

Learn how about flutter logging

The Right way to log data on console is by importing dart inbuilt package “dart:developer”, This allows a developer to print longs information on console while debugging.

So to use developer.log function in flutter app you need to import it.

import 'dart:developer' as logDev;

Now use it to show logs in console like this:

devlog.log(“Your Log Message Here”,name:"myLog");

How to use dart.developer with log function

Video Tutorial

Complete Source Code

main.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'dart:developer' as logDev;

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final List _dataStringList = List.generate(10200, (index) => "$index");

  @override
  void initState() {
    // TODO: implement initState
    logDev.log(_dataStringList.toString(),name: "myLog");
    super.initState();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter Log Messages"),
      ),
      body:Container()
    );
  }
}