Brief tutorial of implementing very primitive app(single list view) using Android Clean Architecture. It won't describe what and why, but rather, how to use it.

1. 2015/11/17
@kengoScal
Android Clean Architecture
for
Dummies

2. About Me
2

3. Self Introduction
name: Kengo Suzuki
twitter: @kengoScal
3
2011∼2014：Security Analyst
2014年11月： Joined MoneyForward
2014年11月∼2015年01月： iOS
2015年02月∼08月：Android
2015年09月∼10月 : Security Architect
2015年11月 : Security Architect/Management + Android

4. 4
In Charge of New Android App!

5. Android Clean Architecture
5

6. What is it & Why using it?
6

7. What is it & Why using it?
7
Not Today.

8. Plenty of Good Entries(with source codes)
8
• English
• Architecting Android…The Clean Way?
• Clean Android Architecture
• MVP for Android: how to organize presentation
layer
• Japanese
• AndroidオールスターズでClean Architectureについて発
表してきた
• これからの設計の話をしよう
• AndroidではMVCよりMVPの方がいいかもしれない

9. Plenty of Good Entries(with source codes)
9
• English
• Architecting Android…The Clean Way?
• Clean Android Architecture
• MVP for Android: how to organize presentation
layer
• Japanese
• AndroidオールスターズでClean Architectureについ
て発表してきた
• これからの設計の話をしよう
• AndroidではMVCよりMVPの方がいいかもしれない
Big Picture
Source Code
Roles
Big Picture
Roles
Presenter

10. Right off the Bat?
10
訳: すぐに/直ちに

11. Need Endurance!
11
• Codes aren t self explanatory
• Lack of experience in using core liibraries could
be pain
• Don t know what goes where.

12. 12

13. Architecure is About Intent, not Frameworks
13
by Robert Cecil Martin

14. With the Hope, no one gives up architecting
14

15. How to use it (Tutorial)
15

16. Primitive App
16
• Single Activity
• Single List View
• Horizontally aligned texts
• Fab
• click and fetch data
• Fetch MusicList(data)
• by Retrofit
• freemusicarchive.org
• DI and EventHub
• Under Construction

17. Click And Fetch Data Tutorial
17

18. The Goal
18
• Click Fab
• Run Retrofit to fetch data
• Not considering data response

19. 19
What We Will Implement
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

20. Thing You Need To Implement
20
• MainActivity
• MusicListPresenter
• MusicListUseCase
• MusicListUseCaseImpl
• MusicListRepository
• MusicListRepositoryImpl
• MusicListEntity

21. Data
Domain
Presentation
Thing You Need To Implement
21
• MainActivity
• MusicListAdapter
• MusicListPresenter
• MusicListUseCase
• MusicListUseCaseImpl
• MusicListRepository
• MusicListRepositoryImpl
• MusicListEntity

22. Presentation - UserAction
22
• Main Activity & MusicListAdapter
• Render List View attaching adapter
• Initialize followings
• repository, usecase, presenter
• Pass FAB clicked event along with Main Thread Info
to Presenter
• MusicListPresenter
• Receive FAB clicked event from View
• Execute MusicListUseCase(Imp) Job
• Pass thread info to MusicListUseCas(Imp)

23. 23
What We Just Implemented
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

24. Domain - User Action to Data Interface
24
• MusicUseCase
• Provide interface between Domain Layer &
Presentation Layer
• MusicUseCaseImp
• Ask MusicListRepository(Imp) for API(External
Resource)
• MusicListRepository
• Provide interface between Domain Layer &
Data Layer

25. 25
What We Just Implemented
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

26. Data - Data Interface to DataSource
26
• MusicListRepositoryImp
• To Fetch external Data
• Declare and Execute Retrofit Http Client
• GET http://freemusicarchive.org/api?
key={key}
• MusicListEntity
• Parse Response and map to domain/model
• gson will handle it.

27. 27
What We Just Implemented
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

28. That s it for Fetching Data
28
Now we want to Reflect Data

29. Reflect Data to View Tutorial
29

30. The Goal
30
• Pass back data just fetched
• Update View

31. 31
What We Will Implement
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

32. Thing You Need To Implement
32
• MusicListRepository#MusicListFetchCallback
• MusicListUseCaseImpl
• MusicListUseCase#MusicListUseCaseCallback
• MusicListPresenter
• MusicListPresenter#MusicListViewCallback
• MainActivity

33. Presentation
Domain
Data
Thing You Need To Implement
33
• MusicListRepository#MusicListFetchCallback
• MusicListUseCaseImpl
• MusicListUseCase#MusicListUseCaseCallback
• MusicListPresenter
• MusicListPresenter#MusicListViewCallback
• MainActivity

34. Domain - Passing Data to User Interface
34
• MusicListRepository#MusicListFetchCallback
• MusicListUseCaseImpl
• Implement MusicListFetchCallback
• So that Main Threat can receive runnable
with command with fetched data
• MusicListUseCase#MusicListUseCaseCallback
• MusicListPresenter
• MusicListPresenter#MusicListViewCallback
• MainActivity

35. 35
What We Just Implemented
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

36. Presentation - Updating View
36
• MusicListUseCase#MusicListUseCaseCallback
• MusicListPresenter#MusicListViewCallback
• MusicListPresenter
• Implement MusicListUseCaseCallback
• Execute methods in MusicListViewCallback
• MainActivity
• Implement MusicListViewCallback
• So that User Case can pass fetched data
• So that Activity can update adapter data

37. 37
What We Just Implemented
• reference
• Architecting Android…The Clean Way?:
• これからの設計の話をしよう

38. That s it!
38

39. Lots of Room for Improvement
39
• Callback Repetition is quite Ugly
• Many Reinvent Wheel
• Not using Dagger, RxJava
• Not a big fun of passing thread around
• Tutorial itself wasn t thoroughly covered

40. Still, Worthwhile
40
Especially, in the team

41. Enjoy Clean Architecting!
41

42. Thank you!

43. References
43
• English
• Architecting Android…The Clean Way?: http://fernandocejas.com/
2014/09/03/architecting-android-the-clean-way/
• Clean Android Architecture: https://speakerdeck.com/richk/clean-
android-architecture
• MVP for Android: how to organize presentation layer: http://
antonioleiva.com/mvp-android/
• Japanese
• AndroidオールスターズでClean Architectureについて発表してきた: http://
tomoima525.hatenablog.com/entry/2015/08/13/190731
• これからの設計の話をしよう: http://www.slideshare.net/
shinnosukekugimiya/ss-50705888
• AndroidではMVCよりMVPの方がいいかもしれない: http://
konifar.hatenablog.com/entry/2015/04/17/010606