2015/11/17 @kengoScal

Android Clean Architecture for

Dummies

About Me

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Self Introductionname: Kengo Suzuki twitter: @kengoScal

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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

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In Charge of New Android App!

Android Clean Architecture

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What is it & Why using it?

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What is it & Why using it?

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Not Today.

Plenty of Good Entries(with source codes)

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• 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

Plenty of Good Entries(with source codes)

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• 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

Right off the Bat?

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訳: すぐに/直ちに

Need Endurance!

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• Codes aren’t self explanatory • Lack of experience in using core liibraries could be pain

• Don’t know what goes where.

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“Architecure is About Intent, not Frameworks”

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by Robert Cecil Martin

With the Hope, no one gives up architecting

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How to use it (Tutorial)

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Primitive App

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• 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

Click And Fetch Data Tutorial

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The Goal

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• Click Fab • Run Retrofit to fetch data • Not considering data response

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What We Will Implement

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

Thing You Need To Implement

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• MainActivity • MusicListPresenter • MusicListUseCase • MusicListUseCaseImpl • MusicListRepository • MusicListRepositoryImpl • MusicListEntity

Data

Domain

Presentation

Thing You Need To Implement

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• MainActivity • MusicListAdapter • MusicListPresenter • MusicListUseCase • MusicListUseCaseImpl • MusicListRepository • MusicListRepositoryImpl • MusicListEntity

Presentation - UserAction

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• 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)

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What We Just Implemented

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

Domain - User Action to Data Interface

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• MusicUseCase • Provide interface between Domain Layer & Presentation Layer

• MusicUseCaseImp • Ask MusicListRepository(Imp) for API(External Resource)

• MusicListRepository • Provide interface between Domain Layer & Data Layer

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What We Just Implemented

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

Data - Data Interface to DataSource

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• 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.

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What We Just Implemented

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

That’s it for Fetching Data

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Now we want to Reflect Data

Reflect Data to View Tutorial

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The Goal

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• Pass back data just fetched • Update View

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What We Will Implement

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

Thing You Need To Implement

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• MusicListRepository#MusicListFetchCallback • MusicListUseCaseImpl • MusicListUseCase#MusicListUseCaseCallback • MusicListPresenter • MusicListPresenter#MusicListViewCallback • MainActivity

Presentation

DomainData

Thing You Need To Implement

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• MusicListRepository#MusicListFetchCallback • MusicListUseCaseImpl • MusicListUseCase#MusicListUseCaseCallback • MusicListPresenter • MusicListPresenter#MusicListViewCallback • MainActivity

Domain - Passing Data to User Interface

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• MusicListRepository#MusicListFetchCallback • MusicListUseCaseImpl

• Implement MusicListFetchCallback • So that Main Threat can receive runnable with command with fetched data

• MusicListUseCase#MusicListUseCaseCallback • MusicListPresenter • MusicListPresenter#MusicListViewCallback • MainActivity

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What We Just Implemented

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

Presentation - Updating View

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• 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

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What We Just Implemented

• reference • Architecting Android…The Clean Way?: • これからの設計の話をしよう

That’s it!

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Lots of Room for Improvement

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• 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

Still, Worthwhile

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Especially, in the team

Enjoy Clean Architecting!

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Thank you!

References

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• 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