Clean Android Architecture

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CLEAN ARCHITECTURE

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Richa Khandelwal [email protected] @richa123

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Who all has ever used MVC?

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MODEL VIEW CONTROLLER Interact with DB Render Model Handle view events Update model Invoke next UI

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Mobile Web Desktop Mobile is diffrent, don’t generalize based on this

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MODEL VIEW CONTROLLER Interact with DB Render Model Handle view events Interact with API/cloud code Manage view state Update model Invoke another view Interact with system components Handle system events Update view based on system events

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Model public class CourseModel { public Course getFromDatabase() { …. } public void getFromNetwork() { …. } }

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View public class ExpandableCourseListActivity { public void onPause() { // save all expanded states } public void onResume() { // restore all expanded states } }

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Controller public void onClick() {} public void onModelUpdated() {} public void onNewNotiﬁcation() {} public void onLocationUpdated(Location location) {} public void takePhoto(Activity activityContext) {} public void launchProﬁlePage(Activity activityContext ) {}

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Interactor?

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JUnit + Mocking

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MODEL VIEW CONTROLLER INTERACTOR Retrieve data from Network Render Model Handle view events Interact with external entities Retrieve data from API/cloud code Manage view state Invoke another view Forward system events to view Forward model updates to view

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View Model ?

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JUnit + Mocking Android + Mocking Espresso + Mocking

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MODEL VIEW CONTROLLER INTERACTOR VIEW MODEL Retrieve data from Network Render View Model Handle view events Interact with external entities Encapsulate view state and behavior Retrieve data from API/ cloud code Invoke another view Update view state

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Presenter ?

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MODEL VIEW PRESENTER INTERACTOR VIEW MODEL Retrieve data from Network Render View Model Handle view events Interact with external entities Encapsulate view state and behavior Retrieve data from API/ cloud code Invoke another view Update view state

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Espresso + Mocking JUnit + Mocking JUnit + Mocking Android + Mocking

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ENTITIES VIEW PRESENTER INTERACTOR VIEW MODEL Retrieve data from Data Sources Render View Model Handle view events Interact with external entities Encapsulate view state and behavior Invoke another view Update view state

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Router ?

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Android + Mocks

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ENTITIES VIEW PRESENTER INTERACTOR VIEW MODEL ROUTER Retrieve data from Data Sources Render View Model Handle view events Interact with external entities Encapsulate view state and behavior Invoke another view Update view state

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Apply Dependency Inversion

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Clean Android Architecture Architecture is about Intents not Frameworks - Uncle Bob

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App to list courses on coursera using Catalog API Github Link -

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Classes • MainActivity • CatalogRouter • CatalogActivity • CatalogPresenter • CatalogViewModel • CatalogInteractor

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MainActivity public void onCreate() { CatalogRouter.getInstance().launchCatalogActivity(); }

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CatalogRouter public void launchCatalogActivity(Context context) { Intent intent = …; context.startActivity(intent) }

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CatalogActivity CatalogPresenter presenter; Action1 onError = new Action1() { public void call(Throwable throwable) { // handle error } });

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CatalogActivity public void onCreate() { presenter = new CatalogPresenter(this); presenter.loadCatalog(onError); }

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CatalogActivity public void onResume() { Action1 catalogUpdateAction = ; presenter.subscribeToCatalogUpdates(catalogUpdat eAction) }

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CatalogActivity public void onPause() { presenter.unsubscribeToCatalogUpdates(); }

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CatalogPresenter CatalogInteractor interactor; public CatalogPresenter(Context context) { viewModel = new CatalogViewModel(); interactor = new CatalogInteractor(context) }

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CatalogPresenter public void loadCatalog() { interactor.loadInteractor() .subscribe(new Action1>() { @Override public void call(List courses) { getData().mCourseList.onNext(courses); } }); }

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CatalogPresenter public void subscribeToCatalogUpdates(Action1 action) { viewModel.subscribeToUpdates(action); } public void unsubscribeToCatalogUpdates() { viewModel.subscribeToUpdates(); }

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CatalogViewModel public ﬁnal BehaviorSubject catalog = BehaviorSubject.create(); public void subscribeToCatalog(Action1 action) { catalog.subscribe(action); } public void unsubscribeToCatalog() { catalog.unsubscribe(action); }

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CatalogInteractor Context mContext; public CatalogInteractor(Context context) { mContext = context; } public Observable loadCatalog() { return catalogDataSource.loadCatalog(); }

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Dealing with Context

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After thoughts

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Build features in new architecture rather than refactor Validate Iterate - learn and apply Don’t refactor all the time