1) The document discusses the promises and concepts of Clean Architecture for Android development, including independence from frameworks, testability, separation of concerns, and independence from UI and data. 2) It provides examples of how Clean Architecture maps to Android, with entities, use cases, repositories, presenters, view models, and views separated into layers. 3) It addresses questions around Clean Architecture, such as whether to have one or multiple use cases per screen, how to handle data validation and caching, and whether to use it for minor UI actions. The document advocates for Clean Architecture but notes it requires team investment.

1. By OCTO & The Refiners
The Good, The Bad and The Bob
Gabriel Adgeg – Dorian Lamandé
NE YEAR
OF CLEAN
ARCHITECTURE

2. ANDROID?Dorian Lamandé Gabriel Adgeg

3. CONTEXTE CONCEPTS REX
DE QUOI TU M'CAUSES LO ?

4. getTalkContext()

15. Architecting iOS Apps
with VIPER

18. androïd

20. OCTO TECHNOLOGY > THERE IS A BETTER WAY

21. OCTO TECHNOLOGY > THERE IS A BETTER WAY

22. getString(R.string.clean_archi_concepts)

23. “
Architecture is not about tools and building materials,
architecture is about usage.
Robert C. Martin

24. Promesses de la Clean Architecture
¤ Indépendante des frameworks
¤ Testable
¤ Indépendante de la UI
¤ Indépendante de la base de données

25. Promesses de la Clean Architecture pour Android
¤ Indépendante des frameworks : SDK Android, Rx,
Dagger
¤ Testable : TDD, JUnit, Espresso, Robolectric
¤ Indépendante de la UI : smartphone, tablette, TV,
chatbot, émulateur
¤ Indépendante de la (base de) donnée(s) : Realm,
Retrofit…

26. Le Lexique Clean
Présentation
Règles Fonctionnelles
Entity
Use-Case/Interactor
Données
Repository/Gateway
Presenter
ViewModel
View

27. UI Thread Worker Thread
Une interprétation de Clean Architecture en action
Core
Interactor
Repository
Interface
Entity
Presenter
Presenter
View
Model
View
Interface
Entity
Repository
Repository
API
Model
Entity
Activity
Fragment

28. UI Thread Worker Thread
Une autre interprétation de Clean Architecture
Interactor
Activity
Fragment
Repository
PresenterView
Controller
Android Java/Kotlin

29. Entity
public class Talk {
private final String title;
private final Date startingDate;
public Talk(String title, Date startingDate) {
this.title = title;
this.startingDate = startingDate;
}
public String getTitle() {
return title;
}
public Date getStartingDate() {
return startingDate;
}
}

30. Interactor
public class TalkInteractor {
private final TalkRepository repository;
private final TalkPresenter presenter;
public void loadTalk(String talkId) {
if (argumentIsValid(talkId)) {
try {
Talk talk = repository.getTalk(talkId);
presenter.presentTalk(talk);
} catch (TalkRepository.TalkRetrievalException e) {
presenter.presentErrorRetrievingTalk();
}
} else {
presenter.presentInvalidArgument();
}
}
}

31. Api Model
@AutoValue
public abstract class JsonTalk {
@JsonCreator
public static JsonTalk newInstance(
@JsonProperty("title") String title,
@JsonProperty("date") Date date) {
return new AutoValue_JsonTalk(title,date);
}
public abstract String getTitle();
public abstract Date getDate();
}
{
"talk": {
"title": "One year of clean architecture",
”date": "2017-04-10T16:20:00"
}
}

32. Repository implementation
public class RetrofitTalkRepository implements TalkRepository {
private final Retrofit retrofit;
@Override
public Talk getTalk(String talkId) throws TalkRetrievalException {
try {
Response<JsonTalk> response = retrofit
.create(Service.class).getTalk(talkId).execute();
if (response.isSuccessful()) {
JsonTalk jsonTalk = response.body();
return transformToEntity(jsonTalk);
}
} catch (IOException ignored) {
}
throw new TalkRetrievalException();
}
}

33. ViewModel
public class TalkViewModel {
private final String title;
private final String startingDate;
public TalkViewModel(String title,String startingDate) {
this.title = title;
this.startingDate = startingDate;
}
public String getTitle() {
return title;
}
public String getStartingDate() {
return startingDate;
}
}

34. Presenter implementation
public class AndroidTalkPresenter implements TalkPresenter {
private final TalkView view;
@Override
public void presentInvalidArgument() {
view.displayError();
}
@Override
public void presentErrorRetrievingTalk() {
view.displayError();
}
@Override
public void presentTalk(Talk talk) {
TalkViewModel viewModel = transformToViewModel(talk);
view.displayTalk(viewModel);
}
}

35. Activity
public class TalkActivity extends AppCompatActivity
implements TalkView {
@Override
public void displayError() {
viewFlipper.setDisplayedChild(DISPLAY_ERROR);
}
@Override
public void displayTalk(TalkViewModel viewModel) {
viewFlipper.setDisplayedChild(DISPLAY_TALK);
titleView.setText(viewModel.getTitle());
startingDateView.setText(viewModel.getStartingDate());
}
}

36. Transformation de la donnée
Repository
"startingDate":
"10-04-2017"
LocalDate
Interactor
LocalDate
Presenter
"Lundi 10
avril 2017"

37. getValue(RX_CLEAN_ARCHI)

38. Et alors ?
Use-case first,
Activity last
Frontières
claires
Use-cases
full Java/Kotlin
TDD 4 real
Cohabitation de 2 libs
pour la couche
réseau

39. C’est quoi le hic ?
¤ Single responsability -> many objects
¤ Nécessite l’investissement de toute l’équipe
¤ Schéma nécessaire
¤ Objets passe-plat

40. Interro surprise
Cohérence
vs
Pragmatisme
Un ou plusieurs
use-cases
par écran ?

41. Interro surprise
Cohérence
vs
Pragmatisme
Validité
de la donnée
Cache
Un ou plusieurs
use-cases
par écran ?

42. Zoom: Cache
RetrofitTalkRepository
Repository
Implementation
TalkInteractor
Interactor
Repository
Interface
TalkRepository

43. Zoom: Cache
Interactor
Repository
Interface
TalkInteractor TalkRepository
RetrofitTalk
Repository
Repository
Implementations
CacheTalk
Repository

44. Interro surprise
Cohérence
vs
Pragmatisme
Validité
de la donnée
Cache
Actions
mineures
sur l’UI ?
Un ou plusieurs
use-cases
par écran ?

45. Idéal pour des gros
projets
Permet la montée
en compétence de
nos jeunes
Le mot de la fin
Clean Archi
2ème version
NOT Tools Driven
Development

46. @dorianlamande
@g_adgeg