A presentation on Clean Architecture in Android and how to implement it by Halyna Halkina.

1. Clean Architecture in Android
well not only in Android, but we did it here
prepared by Halyna Halkina

2. The plan
● How come we’re all here
● The usual way
● The Clean Architecture way

3. Why architecture?

4. How it was before

5. The simplest way
Activities and Fragments (and sometimes even Adapters, brr)
contain everything. All the API calls, saving to DB, logic
manipulations are in them

8. Project structure in a couple of months

9. Navigating through the project be like...

10. Let’s move logic somewhere!
Logic doesn’t belong in the UI. We would like to have some
place where we’ll keep it separately from Views, Activities and
Fragments
That’s exactly how we got Managers

11. Logic classes: Pros
● UI separation from other application stuff
● Ability to split functionality into several Logic Classes
● A bit cleaner code :)

13. Why bad?
Managers (or just collections of random somehow connected logic) tend to grow and
grow as you get more use cases

15. Clean Architecture to the rescue!

16. Clean Architecture by Robert Martin

17. Clean Architecture: Pros and characteristics
● Independent of Frameworks
● Independent of UI
● Independent of Database
● Independent of any external agency

18. Clean Architecture in Android by Fernando Cejas

19. Clean Architecture in Android by Fernando Cejas

20. So what does it all add up to?
We ended up with given scheme:
● Presentation layer - Model-View-Presenter
● Domain layer - Use Cases (using both data layer’s Data
Stores and network API)
● Data layer - Data Stores (storing data in the DB and in
memory cache, using API to get/update information)

21. Sample application structure: modules by Fernando
Cejas and packages by us

22. Sample packages structure

23. Code sample: Data Store Interface

24. Code Sample: Data Store

25. Code sample: Use case

26. Code Sample: Use Case

27. Code sample: Presenter with a use case

28. Code Sample: View

29. Code Sample: View Implementation

30. Thank you for your attention!
Do you have any questions?

31. References
Uncle Bob’s article about Clean Architecture
Fernando Cejas Clean Architecture in Android articles part 1 and part 2
Guide on implementing Clean Architecture in Android by Dario Miličić
An article about MVP
Advocating Against Android Fragments
Series of 3 articles about MVP (with examples)