i am beginner in flutter now and i want to learn software architecture patterns but many confusion in this. i want to know clean architecture and MVVM both are same?
if no?what is difference between them and what is MVVM + clean architecture in flutter
and please let me know best resource to learn as beginner
Clean architecture separates the application into different layers like data, domain, application
MVVM separate view model and the view for the screen in the application folder
I suggest you first read Uncle Bob's explanation of Clean Architecture.
Clean Architecture separates the development (the app in your case) into different layers (most commons are Presentation, Domain, and Data).
For your question: MVVM is actually part of the Presentation layer, in Flutter it's quite similar to the BLoC pattern.
Related
I'm going to develop a management app for a company in Flutter and since I never worked with this framework i was looking for the best practices and desin patterns to use.
The app will be about employes management for a company. The main features will be:
The management of the employes profiles;
The possibility to upload documents directly in the app;
Create online quiz for the employes in trainership;
I'm struggling to choose the right design pattern. Usually for the frontend i use either the MVC or MVVM, but since this is my first Flutter app i made some researches and find out that one of the best pattern for Flutter is BLoC. I already tried to implement a simple app to try this pattern and i understood the way it works, but since I'm a noob in Flutter i was looking for some advices from someon who is more expert than me.
Thank you in advance for the help.
the best practices and design patterns to use it is TTD
it helps you to Keeping your code clean and tested
on the other hand, larger projects start falling apart when you mix the business logic everywhere. Even state management patterns like BLoC are not sufficient in themselves to allow for easily extendable codebase.
to get more information about TTD you can look to this tutorial in this link : https://resocoder.com/2019/08/27/flutter-tdd-clean-architecture-course-1-explanation-project-structure/
I'm a backend developer with background of Java and Python. I've started with Flutter 3 months ago. I find Dart an easy language to learn and fun to write code in. Google did a good job there.
What is challenging for me is figuring out best practices when working with flutter. The official documentation (docs.flutter.dev) is good and it's also interesting to look at the Dart code powering the framework. But I haven't seen a resource that goes over best practices for design/architecture of a Flutter application.
In particular, I'm interested in how to maintain separation of concerns between Database , Domain and Presentation layers.
I'm using Firebase Store for my (realtime) database. The API provides the data in the form of a JSON object (Map). This is fine, but I want to translate this into my own domain model instances (for data validation, enrichment and enforcing other business rules). What I don't know is how to bridge the gap between database and UI (Widgets). I want to keep a Clean Architecture, and would like to learn how to do this correctly. I should also add that I don't have prior experience with Asynchronous code, which seems to be an important skill to gain.
I've experimented in using InheritedWidgets to try and expose my data to the UI/Presentation layer as model instances, without the UI knowing about the specifics of the database, but ran into difficulties because I don't understand the Flutter framework and Dart async programming very well. I also know there are frameworks like Bloc that are supposed to solve data/state management issues. But as much as possible I want to stick to the basics before I start using more elaborate and heavier tools.
What recommended resources are out there that I'm missing, that could help me become a better Dart/Flutter developer?
hi i am a newbie in Coding by self leaning,just kickstarted with flutter development,done a couple of projects,while attending interviews,each one of them is asking about different architectures,seeing lot of architecture names TDD,clean architecture etc,i am bit confused, can somebody please explain which is top architecture ,how to select architectures based on projects,somebody please guide me by explaining why architecture selection is so much important,which is top,or any reference videos or docs might be useful
If you develop Flutter Project,
I can recommend the architecture that is presented by Felix Angelov (BLoC author) in his tutorials - link
Quick summary:
Use BLoC as a state management,
Split the code into repositories (packages),
Separate the logic from widgets,
Divide the whole project into 3 layers (Presentation Layer, Business Layer, Data Layer),
Provide tests (do not merge without 100% tests coverage)
When I start programming a new application in flutter everything goes well at the beginning but when the project grows up it starts to become messy, and then I decide to delete the project to start over.
I searched about the clean architecture and design patterns but I found a lot of choices such as DDD, BLoC, and so many patterns and architectures, I didn't what is the best thing to stick with every time I enter a research process that lasts forever.
So I want to hear from you as professionals and expert coders what is the best thing to stick with and what should I do? please give some advice on how to deal with big projects in flutter?
Thank you very much
Firstly the Flutter project architecture is very subjective because it depends on your needs.
But we can find some general principles:
Use a router system : By default flutter provide a Navigator API to let you navigate through your app. But there is no real structure and when you want to use push notifications to redirect the user to your App you will be stuck.
GoRouter package delivers a very nice router system, and Google teams are thinking about implementing it into the Flutter SDK.
Take advantage of a StateManagement library : When your application will become bigger you will want to handle the state of the app more precisely. So you will be able to refresh and update the content of pages easily and without reloading the content. To do that there are a lot of packages :
BLoC
Provider
Cubit
GetX
Handle the data (like API JSON Response, or SQLite Query). A huge part of a clean architecture is the way you manage the data. If you use an API you have to deal with JSON Serialization. In a small app you can do your own system to deserialize data, but you have to implement a lot of boilerplate code. I recommend to use build_runner and json_serializable packages. This stack of plugins lets you build your data classes easily without worrying about the serialization : BuildRunner will generate this code for you.
Use a structured folder system. Personally I used the DDD pattern, because you can easily separate your data from the logic of your app, this improves your maintainability.
Schema of a Flutter Clean Architecture with DDD
I hope this will help you to develop your own architecture. To wrap up, here are some helpful resources on this topic.
https://devmuaz.medium.com/flutter-clean-architecture-series-part-1-d2d4c2e75c47
https://docs.flutter.dev/development/data-and-backend/json
https://codewithandrea.com/articles/flutter-project-structure/
It's a good idea to choose layer-first or feature-first approach for your project as step one. Mentioned link to Andrea's article is a great one - https://codewithandrea.com/articles/flutter-project-structure/
Then you choose whether you want to use Riverpod with providers or blocs and/or cubits. You can write an app with all of them, so I would recommend to try them first and then make a choice. For example, I wrote a Flutter app using cubits only.
Next, you can choose routing library, to make life easier with navigating to/from screens, deep linking etc. Either auto_route or go_router is good.
Also, make use of libraries for json serialization, data classes, injectables, as they save you from lots of boilerplate code.
Any good sample WP7 application using MVVM model in the optimal way?
I'm creating my first WP7 app, and I'm using MVVM as far as I can tell, but I'm not sure I'm doing it the right way. I have one view model per page, instead of one main view model that branches to each page, I'm not sure which is the correct way to do, so I'm hoping there's a sample app out there that I can check out.
Thanks!
Edit: I'm also having another problem on saving the ViewModels in the application state, because I think they have to be serializable (haven't worked much into this), the thing is that when I start a task and come back to the app, the latter has already been deactivated by calling the former, so I have to serialize its state when deactivated and [re]serialize it when [re]activated. This is how I save the state when deactivated:
object[] viewModels = new object[3];
viewModels[0] = App.ViewModelPage1;
viewModels[1] = App.ViewModelPage2;
viewModels[2] = App.ViewModePage3;
PhoneApplicationService.Current.State.Add("LastState", viewModels);
Again, this is probably not efficient way to do it, so I'm hoping I can see a sample app that handles this well too.
Thanks!
Have you looked at using the MVVM Light toolkit?
Serialization best practices will vary based on the volume of data in the model, the number of models being used and whether it's necessary to always load all of the models.
You might want to check out Caliburn Micro. It is used to implement a number of user experience patterns but it supports WP7 and has sample code.
Here's some MVVM samples and guidance you can check out.
C#er : IMage: Model-View-ViewModel (MVVM) Explained
.NET by Example: Using MVVM Light to drive a Windows Phone 7 / Silverlight 4 map viewer
The simplest way to do design-time ViewModels with MVVM and Blend.
Also an overview here of MVVM frameworks you may find worth a look.
JAPF » Blog Archive » Discover and compare existing MVVM frameworks
Light weight seems to be good and MVVM Light is popular. Laurent demos MVVM in the Mix 10 video EX14 if you want to check that out too.
This months MSDN magazine has an article on creating a WP7 Sudoko app using MVVM.
http://msdn.microsoft.com/en-us/magazine/gg490347.aspx
HTH
Here is my article which describes the approach to build WP7 applications using advantages of separation of concerns:
a framework for building of WP7 application