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My way to clean android V2
Christian Panadero presented an overview of his "My Way to Clean Android v2" approach. The approach advocates for decoupling the app from frameworks, UI, BDD, and any implementation details. It utilizes concepts like the command pattern, decorator pattern, interactors, abstractions, repositories, and data sources. The approach models the app with layers including presentation, domain/entities, repository, and data sources. It aims to make implementation details swappable and follow dependency rules.
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My way to clean android V2
- 1. My way toclean Android v2 Christian Panadero http://panavtec.me @PaNaVTEC Github - PaNaVTEC My Way to clean Android V2
- 2. My way toclean Android v2 Agradecimientos Fernando Cejas Jorge Barroso Pedro Gomez Sergio Rodrigo @fernando_cejas @flipper83 @pedro_g_s @srodrigoDev Android developer en Sound CloudAndroid developer en Karumi Cofounder & Android expert en Karumi Android developer en Develapps Alberto Moraga Carlos Morera @albertomoraga @CarlosMChica iOS Developer en Selltag Android Developer en Viagogo
- 3. My way toclean Android v2 “My way to clean Android”
- 4. My way toclean Android v2 • Desacoplado de los frameworks • Testable • Desacoplado de la UI • Desacoplado de BDD • Desacoplado de cualquier detalle de implementación ¿Por qué Clean?
- 5. My way toclean Android v2 • Patrón command (Invoker, command, receiver) • Patrón decorator • Interactors / Casos de uso • Abstracciones • Data Source • Repository • Procesador de Anotaciones Conceptos
- 6. My way toclean Android v2 Niveles de abstracción Presenters Interactors Entidades Repository Data sources UI Abstractions
- 7. My way toclean Android v2 Regla de dependencias Presenters Interactors Entidades Repository Data sources UI Abstractions
- 8. My way toclean Android v2 • App (UI, DI y detalles de implementación) • Presentation • Domain y Entities • Repository • Data Sources Modelando el proyecto
- 9. My way toclean Android v2 Dependencias del proyecto App Presenters Domain Data Entities Repository
- 10. My way toclean Android v2 Flow View Presenter Presenter Interactor Interactor Interactor Interactor Repository Repository DataSource DataSource DataSource
- 11. My way toclean Android v2 UI: MVP ViewPresenter(s) Model Eventos Rellena la vista Acciones Resultados de esas acciones
- 12. My way toclean Android v2 UI: MVP - View public class MainActivity extends BaseActivity implements MainView { @Inject MainPresenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); presenter.attachView(this); } @Override protected void onResume() { super.onResume(); presenter.onResume(); } @Override public void onRefresh() { presenter.onRefresh(); } }
- 13. My way toclean Android v2 UI: MVP - Presenter public class MainPresenter extends Presenter<MainView> { public void onResume() { refreshContactList(); } public void onRefresh() { getView().refreshUi(); refreshContactList(); } }
- 14. My way toclean Android v2 UI: MVP - Presenter @ThreadDecoratedView public interface MainView extends PresenterView { void showGetContactsError(); void refreshContactsList(List<PresentationContact> contacts); void refreshUi(); } public interface PresenterView { void initUi(); } prevents spoiler :D
- 15. My way toclean Android v2 • El problema de las rotaciones está en la capa de UI • configurationChange recrea toda la Activity • onRetainCustomNonConfigurationInstance al rescate! • Retener el grafo de dagger onConfigurationChange Hell
- 16. My way toclean Android v2 onConfigurationChange Hell public abstract class BaseActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { createActivityModule(); } private void createActivityModule() { activityInjector = (ActivityInjector) getLastCustomNonConfigurationInstance(); if (activityInjector == null) { activityInjector = new ActivityInjector(); activityInjector.createGraph(this, newDiModule()); } activityInjector.inject(this); } @Override public Object onRetainCustomNonConfigurationInstance() { return activityInjector; } protected abstract Object newDiModule(); }
- 17. My way toclean Android v2 Presentation - Domain (ASYNC) Presenter Invoker Interactor Output Invoker IMP Interactor
- 18. My way toclean Android v2 Presentation - Domain (SYNC) Presenter Invoker Future Invoker IMP Interactor .get();.cancel();
- 19. My way toclean Android v2 Presentation - Domain public class MainPresenter extends Presenter<MainView> { @Output InteractorOutput<List<Contact>, RetrieveContactsException> output; public MainPresenter(…) { InteractorOutputInjector.inject(this); } public void onResume() { interactorInvoker.execute(getContactsInteractor, output); } @OnError void onContactsInteractorError(RetrieveContactsException data) { getView().showGetContactsError(); } @OnResult void onContactsInteractor(List<Contact> result) { List<PresentationContact> presentationContacts = listMapper.modelToData(result); getView().refreshContactsList(presentationContacts); } }
- 20. My way toclean Android v2 Domain - Interactor public class GetContactInteractor implements Interactor<Contact, ObtainContactException> { private ContactsRepository repository; private String contactMd5; public GetContactInteractor(ContactsRepository repository) { this.repository = repository; } public void setData(String contactMd5) { this.contactMd5 = contactMd5; } @Override public Contact call() throws ObtainContactException { return repository.obtain(contactMd5); } }
- 21. My way toclean Android v2 Bye bye thread Hell! public class DecoratedMainView implements MainView { @Override public void showGetContactsError() { this.threadSpec.execute(new Runnable() { @Override public void run() { undecoratedView.showGetContactsError(); } }); } }
- 22. My way toclean Android v2 Bye bye thread Hell! public abstract class Presenter<V extends PresenterView> { private V view; private ThreadSpec mainThreadSpec; public Presenter(ThreadSpec mainThreadSpec) { this.mainThreadSpec = mainThreadSpec; } public void attachView(V view) { this.view = ViewInjector.inject(view, mainThreadSpec); } public void detachView() { view = null; } public V getView() { return view; } }
- 23. My way toclean Android v2 Bye bye thread Hell! public class MainThreadSpec implements ThreadSpec { Handler handler = new Handler(); @Override public void execute(Runnable action) { handler.post(action); } } public abstract class Presenter<V extends PresenterView> { public void attachView(V view) { this.view = ViewInjector.inject(view, mainThreadSpec); } } @ThreadDecoratedView public interface MainView extends PresenterView { … }
- 24. My way toclean Android v2 Repository Network Data Source BDD Data Source Repository Model Data
- 25. My way toclean Android v2 Repository Interface public interface ContactsRepository { List<Contact> obtainContacts() throws RetrieveContactsException; Contact obtain(String md5) throws ObtainContactException; }
- 26. My way toclean Android v2 Repository imp @Override public List<Contact> obtainContacts() throws RetrieveContactsException { List<Contact> contacts = null; try { contacts = bddDataSource.obtainContacts(); } catch (ObtainContactsBddException … ce) { try { contacts = networkDataSource.obtainContacts(); bddDataSource.persist(contacts); } catch (UnknownObtainContactsException … ue) { throw new RetrieveContactsException(); } catch (PersistContactsBddException … pe) { pe.printStackTrace(); } } return contacts; }
- 27. My way toclean Android v2 Data source Model Data source Imp Data source Mapper
- 28. My way toclean Android v2 Data source Interface public interface ContactsNetworkDataSource { public List<Contact> obtainContacts() throws ContactsNetworkException …; }
- 29. My way toclean Android v2 Data source imp private ContactsApiService apiService; private static final Transformer transformer = new Transformer.Builder().build(ApiContact.class); @Override public List<Contact> obtainContacts() throws ContactsNetworkException { try { ApiContactsResponse response = apiService.obtainUsers(100); List<ApiContactResult> results = response.getResults(); List<Contact> contacts = new ArrayList<>(); for (ApiContactResult apiContact : results) { contacts.add(transform(apiContact.getUser(), Contact.class)); } return contacts; } catch (Throwable e) { throw new ContactsNetworkException(); } }
- 30. My way toclean Android v2 Caching Strategy public interface CachingStrategy<T> { boolean isValid(T data); } public class TtlCachingStrategy<T extends TtlCachingObject> implements CachingStrategy<T> { private final long ttlMillis; @Override public boolean isValid(T data) { return (data.getPersistedTime() + ttlMillis) > System.currentTimeMillis(); } }
- 31. My way toclean Android v2 Caching Strategy @Override public List<Contact> obtainContacts() throws ObtainContactsBddException … { try { List<BddContact> bddContacts = daoContacts.queryForAll(); if (!cachingStrategy.isValid(bddContacts)) { deleteBddContacts(bddContacts); throw new InvalidCacheException(); } ArrayList<Contact> contacts = new ArrayList<>(); for (BddContact bddContact : bddContacts) { contacts.add(transform(bddContact, Contact.class)); } return contacts; } catch (java.sql.SQLException e) { throw new ObtainContactsBddException(); } catch (Throwable e) { throw new UnknownObtainContactsException(); } }
- 32. My way toclean Android v2 • La lógica de negocio no sabe de donde vienen los datos. • Fácil de cambiar la implementación de los orígenes de datos. • En caso de cambio de orígenes de datos la lógica de negocio no se ve alterada. Ventajas de Repository
- 33. My way toclean Android v2 – Uncle Bob “Make implementation details swappable”
- 34. My way toclean Android v2 Picasso public interface ImageLoader { public void load(String url, ImageView imageView); public void loadCircular(String url, ImageView imageView); } public class PicassoImageLoader implements ImageLoader { private Picasso picasso; @Override public void load(String url, ImageView imageView) { picasso.load(url).into(imageView); } @Override public void loadCircular(String url, ImageView imageView) { picasso.load(url).transform(new CircleTransform()).into(imageView); } }
- 35. My way toclean Android v2 ErrorManager public interface ErrorManager { public void showError(String error); } public class SnackbarErrorManagerImp implements ErrorManager { @Override public void showError(String error) { SnackbarManager.show(Snackbar.with(activity).text(error)); } } public class ToastErrorManagerImp implements ErrorManager { @Override public void showError(String error) { Toast.makeText(activity, error, Toast.LENGTH_LONG).show(); } }
- 36. My way toclean Android v2 • Trabaja siempre con abstracciones nunca con concreciones. • Usa un buen naming, si ves que hay alguna figura que has creado que no sabes que nombre poner, seguramente esté mal modelada. • Si creas nuevas figuras usa la diana inicial para asegurarte que las creas en la capa correspondiente Consejos
- 37. My way toclean Android v2 – Uncle Bob “Clean code. The last programming language”
- 38. My way toclean Android v2 In Uncle Bob we trust
- 39. My way toclean Android v2 https://github.com/PaNaVTEC/Clean-Contacts Show me the code!
- 40. My way toclean Android v2 • Fernando Cejas - Clean way • Jorge Barroso - Arquitectura Tuenti • Pedro Gomez - Dependency Injection • Pedro Gomez - Desing patterns • Uncle Bob - The clean architecture • PaNaVTEC - Clean without bus Referencias
- 41. My way toclean Android v2 ¿Preguntas? Christian Panadero http://panavtec.me @PaNaVTEC Github - PaNaVTEC