Flutter Bloc Tutorial For Beginners | BLoC Architecture/Pattern & State Management Explained

In this course, we will learn about the Flutter Bloc State Management Tool along with the BLoC Architecture/Pattern by creating 4 Projects using Flutter! We will learn about Bloc, Cubit, BlocProvider, BlocBuilder, BlocConsumer, BlocListener, RepositoryProvider, BlocObserver and various methods and functionalities they offer. Along with that, we'll learn about Bloc vs Cubit, understanding when to use what and just simplifying Bloc down by a lot. We'll also learn about writing clean code by implementing BLoC Pattern in an API Powered Project.
Source Code: github.com/Riv...
📌 Discord Server - / discord
Resources:
20 Hours Flutter Beginners Course - • The Complete Dart & Fl...
Provider in 7 Minutes - • Flutter Provider State...
ToDo List Beginner Files - github.com/Riv...
Login Form App Beginner Files - github.com/Riv...
Weather App Beginner Files - github.com/Riv...
Timestamps:
(00:00:00) Introduction
(00:00:44) Project Setup + Bloc Installation
(00:03:39) Counter App With Cubit State Management - Overview
(00:30:38) Counter App With Bloc State Management - Overview
(00:49:48) Similarity Between Bloc & Cubit
(00:50:18) Todo List App With Cubit - BlocBuilder, onChange, onError
(01:11:59) Login Form App with Bloc - States, Events, BlocListener, BlocConsumer, onTransition, bloc_concurrency
(01:56:31) BlocObserver
(02:01:09) Weather App - BLoC Architecture Pattern
(02:30:18) BLoC Pattern Recap
(02:33:36) Is BLoC Unnecessary work?
(02:34:15) Conclusion
Connect With Me Here:
GitHub: github.com/riv...
Linkedin: / rivaan-ranawat
X: x.com/RanawatR...
Medium: / namanrivaan
Instagram: / optimalcoding

[@GameSteals]

At 1:04:56, no offense, but the explanation seemed a bit flaky. Here are my 2 cents on why the state is not changing even after adding a new to-do object in the 'state' list. When we first initiate the state with an empty list [], this list has an address in memory (say A1), similar to how a house has an address. Continuing with this analogy, like how if more people start residing in the house, the address of the house does not change, similarly if we add more elements in the list, the address of the list will also not change. The emit() function likely compares two states based on the r-value (which is address in the case of Lists, Maps, and objects, and the actual value in the case of primitives like int, float, double, etc). Here emit() concludes that the state has not changed, since the address of the list has not changed, therefore it stops any further processing. Therefore, to actually change the address of the list, 1. We have to create a copy of the list (This creates a new list with a new address (say A2)) 2. Add the items in this new list 3. Pass this new list to emit() Now when emit() compares the two lists, it finds that the address is different, and it updates the state. Hope this helped someone.

[@RivaanRanawat]

Good explanation, thanks for taking the time to write & help others!

[@sagarshah5341]

Man you are good at DSA!

[@jatindersinghaujla]

​@@sagarshah5341 it's general programming concepts not dsa. It works based on the address of list, map etc. To understand this in details need to know how equals and hashcode works

[@sagarshah5341]

@@jatindersinghaujla The guy understood what I was implying.

[@andrewspourgeon]

Damn Good explanation Bro , But I didn't understood one thing , as per u r explanation - When we first initiate the state with an empty list [], this list has an address in memory (say A1) which does not contain any value. - Then if we add a value to that list the address of the list will still be the same - According to this analogy , why the first element that is being added is getting shown ? - If u observe clearly at 1:02:55 the first value is shown , its stopped showing only from 2nd value

[@MrxAmjad]

As of now, This man is God Gift for flutter developer, His insane contribution for Flutter Developers always be memorable in flutter history, this much quality content absolutely for free is ❤❤❤❤❤.

[@RivaanRanawat]

Thank you so much!!

[@yarachesu2604]

It is hard working not a gift.

[@AkshayGupta-qb1yn]

You're a genius! Unlike other KZbinrs who explain everything at the beginning, you saved the block definition explanation for the end of the video. I really appreciate your content, and thanks to your 2-hour 30-minute tutorial, I successfully cracked the interview. Thank you!

[@LinuxUser_]

As my 7th-semester exams are concluding next week in pursuit of a CS degree, I'm eager to delve into Flutter projects. I already have a grasp of Flutter and Dart basics. However, time is limited, and with companies beginning recruitment, I'm feeling the pressure due to the absence of projects. I would greatly appreciate your guidance, Rivaan, including video recommendations to kickstart my Flutter journey, project ideas, and tips for both project development and placement preparation. Your assistance means a lot 🙏🏻

[@hashir2749]

Seen a lot of state management tutorials but this one is on Top.

[@kevinvishal9071]

This tutorial is a gem for Flutter developers. The explanations provided are incredibly detailed, making a complex pattern appear straightforward. I'm grateful for the thorough guidance provided by the instructor. Thank you, Master.❤

[@samuelvmoura]

Wow, I've been after some good, well explained bloc tutorials for a while and yours got literally all my questions answered. thank you so much!

[@synnotus]

You are the best thing ever happened to flutter. Your explanations are beginner friendly. Thanks

[@RivaanRanawat]

Thank you!

[@Basslanyience]

Thanks so much. This course was a long overdue for me but I finally got it done. I feel way more confident about Bloc and Cubit now.

[@pratyushvaibhav]

Hats off A big round of applause ✋ A big thanks for this 🙏

[@RivaanRanawat]

My pleasure!

[@Vikram_Naik]

Manhhhh! This is the best tutorial out in KZbin for bloc state management You are amazing

[@Mitsue51]

Thanks, it's really helpful because following the login tutorial from the bloc documentation wasn't enough for a beginner like me. You explain really well, thanks for your time

[@numan947]

Hey! Just wanted to say thanks! I was on the fence about whether to invest about 3 hours of my time in it, but I am glad I did. Your shown examples along with the explanations helped clear out a lot of the confusions and questions I had.

[@richardwindley7355]

When I started watching, I thought "I won't sit here for 2.5 hours..." but I did. This is a great video which explains the subject matter very clearly with good examples.

[@DataSet]

For those who don't know, Rivaan is only 17

[@c00per_]

Ikrrrr💀🗿💥

[@rakshithadilshan9888]

Very valuable content. No one has taught like this❤

[@KhawarShahzad-lj9gh]

For first time I saw a tutorial completely. 🙂

[@SohaibSanaa]

I came to learn Bloc State Management and ended up as his fan. I love the way how he Explain and teach. If this course was on Udemy, he must hai Millions of Students by now. (An this course should be on Platforms like Udemy) 💯❣💫

[@anurudhsingh3397]

I have no words!! Fluent like air!!!! Thanks !!!!

[@RivaanRanawat]

Thank you!

[@jatindersinghaujla]

This video is worth watching. You cleared so many doubts.

[@roninspect4357]

a big project with bloc and supabase would be very awesome & unique.

[@rolesquare3624]

I was wondering when Rivaan will move to bloc and here it is. Thank you for showing me a lot in flutter.

[@RivaanRanawat]

My pleasure!

[@VaibhavC-co1bi]

this is so awesome bloc tutorial and very clear so that developers like me can understand. Can you make a video about the features first appraoch or some project based on bloc

[@RivaanRanawat]

Will be coming soon, hopefully March!

[@hussainrizvi5423]

OH MY GOD!!! THANK YOU SO MUCH SIR... this is by far the best video for bloc tutorial.

[@RishabhTiwari-v3l]

A Very Big Thanks to You Sir ❤❤

[@andrewspourgeon]

Dear Rivaan , U have an excellent explanation skills bro ❤‍🔥 , This one is a gem 😍

[@hokitamo]

best teacher ever!

[@arnaudroncari2468]

Such a great teacher !

[@RivaanRanawat]

Thank you!

[@muhammadbilal-sd9kf]

Your way of explaining bloc pattern is amazing. Please make a video of about MVVM architecture using provide. thanks

[@hurbangash1302]

i did not know bloc was so easy .thank you so much rivan bhai

[@jayisampelliwar5065]

finally, the Most awaited video ✅ best flutter channel exists on YT

[@RivaanRanawat]

Thank you!!

[@malukishtiaq]

You are just awesome my friend. I watch your videos on priority. It helps me stay polished.

[@arminyazdian6598]

Thank you so much for putting huge amount of time and effort!

[@manohar.acharya]

was despereatly waiting for bloc wanna see fullstack project on bloc & cubit

[@its_suresh_v]

Riwan love you man the way you explained bloc outstanding brother, Crystal-clear explanation superb 👏

[@nisafv.a8710]

Thankyou so much maaan . Really helpful ❤ . God bless

[@aizen_3438]

Hats off waiting for this 🔥

[@RivaanRanawat]

Hope it was helpful!

[@alanta335]

best tutorial i heard in a long time🤩

[@RivaanRanawat]

Thanks!

[@justetk]

Nice Video! Thanks from Azerbaijan!

[@faridahmadov5991]

You are the best tutor ever!

[@RivaanRanawat]

Thank you!!

[@chitko1706]

awesome sir. you are the mentor who i was looking for🎉.please,upload more.

[@Badshah1614]

Thank you so much sir for uploading a new flutter video again . How long have we been waiting for your next Flutter video?

[@maulahaz]

MashaAllah.. very good explanation. Deep like diving in the ocean. Recommended to watch.

[@RivaanRanawat]

Thank you!

[@sabinpoudel6969]

Rivaan you are gem for a flutter community. Thanks for clearing my doubts.!!!

[@RivaanRanawat]

Glad it was helpful:)

[@user-zq1il5lj4h]

An Advantageous tutorial.👋

[@RivaanRanawat]

Glad you think so!

[@muammar88]

Man you rock! Thanks a lot for sharing your expertise ❤

[@aouadicharaf1038]

finished!! Amazing content ❤❤❤

[@RivaanRanawat]

Thank you!

[@amityadav85]

brilliant! thank you kind sir! very nice method of teaching!

[@abidhasansnigdho]

You are awesome at making complex things easy ❤

[@RivaanRanawat]

Thank you!

[@LelloApp]

it was fantastic!!! thanks

[@RivaanRanawat]

Glad you liked it!

[@muhammadjavedrafique4592]

oh yrr Rivan i dont know who told you what we need on which time 🤣🤣.... tnku Gem

[@RivaanRanawat]

Hahaha, thank you!

[@footballace8371]

Please do a video on Stacked MVVM Architecture

[@scorpionadvertising8808]

He is a better teacher than a coder😂

[@pravinprince3221]

Thank you for the wonderful tutorial bro, it is very helpful for me and my team thanks again

[@RivaanRanawat]

My pleasure!

[@pallabroy8800]

Pls make a dedicated course on fl_charts and also make a video on how to use fl_charts with api to use real time data for the graphs

[@livingfreeely]

thanks a lot Rivaan

[@arthonuy7211]

Hey Rivaan I have a doubt in Todo app , when we first update the empty list by state.add() then emit(state) then why emit is notifying the listeners about the change? I mean todo list page should not show anything right?

[@sujalutekar9417]

I was waiting for this only 🔥🔥

[@RivaanRanawat]

Hope it helps!

[@techwithotabek]

Hey Rivaan, great tutorials brother. Can you also make a tutorial for Provider like you did for Bloc?

[@RashidKhan-kd9xl]

He had it.. you can see it ( in his 3rd app in 20h course of flutter for beginners) but there nothing much in providers ❤

[@user-hq6ul4ob2z]

Outstanding Explanation.....

[@RivaanRanawat]

Thank you!!

[@azamovdev]

Good Bro I wish luck your works

[@aash1r869]

Hey Rivaan, Kindly make a video on Flutter using Stacked state management, tutorials on stacked are almost impossible to find, would be of great helpp!

[@user-rk3me5st3q]

this is pure gold

[@PaoloTshiyole]

That's amazing, good video May you do a video with flutter and gemini pro api please

[@Eunsmoqj]

You are insane. Thx for everything. Im learning from u a lot.

[@sagarshah5341]

On 25:09 would it be a better idea to create a global object for the class CounterCubit? That way we only have to deal with the global instance of the state! What do you think? class CounterCubit extends Cubit { // int counter = 0; CounterCubit() : super(0); void incr() { emit(state + 1); } void decr() { if (state == 0) { return; } emit(state - 1); } } // after creating this object in the same file, no NEED for an extra PROVIDER at all final gCounterCubitObj = CounterCubit();

[@user-gl8mz7jm4l]

can you create the video like how can we dependency inject, using the annotation, and using of json serizable and more

[@hurbangash1302]

rivan bhai next responsive design tutorail please

[@pravinprince3221]

Good morning bro one more request bro can you please do detailed videos on bloc_concurrency and transformer like this one please

[@shhhhh.]

Great video 👌👌👌

[@rifkiardiansyah616]

Bro, you saved me

[@ndonnayacynth1991]

Thank you so much

[@RivaanRanawat]

Pleasure!

[@user-bg1ks1rq4o]

Amazing video, that's very good

[@RivaanRanawat]

Thank you!

[@pradeepg4498]

How to handle stream and bloc state value in another bloc

[@faheemahmadofficial7701]

Thanks great help, would like to see firebase full using clean arvh and cubit all cruds fcm cloud functions and model based work

[@__basith__742]

see you should also include stream subscrption using bloc it would be every much appreciated

[@kobab4270]

Thank you for this! But after finishing this, the weather app didn’t work anymore. The circular progress indicator was just circling infinitely. I tried to run your finished weather app folder on GitHub to check if I didn’t make some kind of error while following the video, but I still got an error, this time "type 'int' is not a subtype of type ‘double' in type cast"

[@user-nt3oq6cp5n]

your video is very useful! So, i have one Question, Is there any no need domain layer that use in clean architecture?

[@Revanth233]

Tqsm bro for making videos most beautiful 😍

[@RivaanRanawat]

Most welcome!

[@zaitoontech]

Awesome thanks bro

[@jainambarbhaya1736]

so which is more recommended Bloc or Riverpod ?

[@user-cd5mk5rv9d]

Such a great Tutorial.

[@RivaanRanawat]

Thanks, glad you liked it!

[@hiteshnath7729]

Bro can you send your vscode settings json, I loved your theme ❤

[@faridahmadov5991]

Quite good explain

[@manulagadec6846]

23:40 🤣 you're the goat

[@River-mm6jw]

Part 2 : Bloc + Freezed with Clean Architecture

[@ramandahiya6977]

well explained

[@usmanofficial4881]

Thank you so much for tutorial sir.. but getting one error in weather app after all functionality done. "int is not subtype of double" this error also occurred in your weather app that i got from your github and run it then same error got

[@code_-rq1wh]

which file icon theam your are useing

[@jayisampelliwar5246]

Which theme are you using? Could you please tell me the name ???

[@mohamed1khaled2]

.

[@mohamed1khaled2]

write this in search and we found the theme 'eserozvataf.one-dark-pro-monokai-darker' the name is One Dark Pro Monokai Darker theme

[@nullcodeer]

great boss...................

[@RivaanRanawat]

Thanks!

[@drreload6726]

Please give a tutorial for getx. Not able to find proper documentation.

[@madmilitiangaming5694]

amazing content

[@HGHG-yn4uo]

You are the best 😘😘

[@RivaanRanawat]

Thank you!

[@akshatt25]

Rivaan It would be really great if you make a Spotify clone (integrating Spotofy API) it's API is considered to be real tough

[@szyszak9424]

1:37:17 when after circular loading indicator ends it shows previous screen for a bit and then goes to next one, is it a glitch or what?

[@fidelahm3027]

how to grant permission to open user system settings??

[@de-day1882]

Hey Rivan, if you got any time(free) can u make a video on backend dart_frog, about its advantages and dis-.

[@joelmathew3253]

Great one

[@RivaanRanawat]

Thanks Joel!

[@mohammadsaidi880]

love love love from Bangladesh

[@RivaanRanawat]

Thank you!