Android Architecture 총정리

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-BSHF4DBMF"QQਸਤೠ   উ٘۽੉٘ ইఃఫ୊ ୨੿ܻ 4QFBLFS ъࢎܕ Slide Link: https://speakerdeck.com/saryong

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Who is this guy? • ҃۱ 19֙ର SW ূ૑פয • ತস ੹ޙо: ޷Ҵীࢲ ೠ ߣ, ೠҴীࢲ ف ߣ झఋ౟স ହস ҃೷ • IBM iX Japanীࢲ Android/iOS ׸׼ Senior Specialist۽ Ӕޖ ઺ • Droid Knights 2018 - ղо উ٘۽੉٘ ূ૑פযо غ঻ਸ ٸ ইޖب ঌ۰઱ ૑ ঋ਷ Ѫٜ

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IBM iX Japan - We’re building business by design • Design Thinking, Mobile Interaction, Digital Strategy, … • ઝ਋૑р ࢜܂Ҋ ੤߀Ҋ, ਬ੷ ૑ೱ੸ੋ न ӝࣿ/ࢎসਸ ҳഅ೧઱ח ஶࢸ౴ ઑ૒ • ઱ਃ Ҋё: ੌࠄ 10؀ Ӓܛ, ਷೯ࢎ, ন؀ ೦ҕࢎ

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ݾର • Part I. ࢲۿ 1. ઱੄ࢎ೦ 2. ࢶࣻ ૑ध: উ٘۽੉٘ ইఃఫ୊ 4࠙݅ী ߶ۅ஖ӝ - MVC, Clean Architecture, Testability, Reusability • Part II. Non-MVC ইఃఫ୊ ୨੿ܻ 1. Non-MVC ইఃఫ୊੄ ӝࠄ ࢸ҅ ੹ۚ 2. MVP 3. MVVM 4. Redux • Part III. New Trend in 2019 1. Rx vs non-Rx 2. Multi-module • Part IV. Best Practices

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Part I. ࢲۿ

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1. द੘ೞӝ ੹ ઱੄ࢎ೦ • ૑ա஘ ӝ؀ Ә૑ - 45࠙ ъ੄ী ցޖ ݆਷ Ѧ ӝ؀ೞदݶ ݒ਋ Ҍۆ.. • ঐӝ Ә૑ - ਗܻܳ ੉೧ೞח Ѫ੉ ؊ ઺ਃ • ޖడ؀Ҋ ժٙೞӝ Ә૑ - ৵ ੷۠ ফӝܳ ೞחоܳ ੉೧ೞҊ, ౸ױ਷ ৈ۞࠙ झ झ۽ • ࢎ૓ ୫৔ ޖॶݽ: ठۄ੉٘ח ইې ݂௼ীࢲ ׮਍ ߉ਵप ࣻ ੓णפ׮ • https://speakerdeck.com/saryong

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৵, ౠ߹൤ উ٘۽੉٘ ইఃఫ୊ ࢸ҅/ҳഅী ੓যࢲ, ࠺౸੸ ࢎҊ о ઺ਃೠо? • General Practiceח ݆਷ؘ Best Practiceח ଺ইࠁӝ য۵׮ • ब૑য Gࢎо ݅ٚ ࢠ೒ઑର цۿਸ߅੄ ৈ૑о.. • ইఃఫ୊ ಁఢ੄ Ѯਸ ݍࠁѱ ೧઱ח Ӗ਷ ݆૑݅ ೨ब ୍೟ী ؀೧ ফӝೞ ח Ӗ਷ ݒ਋ ൞߅ೞ׮ • э਷ ੉ܴਸ о૓ ইఃఫ୊ ಁఢب п੗ ࢚ടী ٮۄ ݒ਋ ੉૕੸ਵ۽ ҳഅؼ ࣻ ੓׮

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2. ࢶࣻ૑ध • Architecture੄ ӝࠄ ઺੄ ӝࠄ: MVCۆ ޖ঺ੋо? • Model = State + ࠺ૉפझ ۽૒ + ؘ੉ఠ ੷੢ࣗ • View = UI (ࠁా declarativeೞѱ ҳഅؽ) • Controller = Flow ۽૒ + [࠺ૉפझ ۽૒] + [State]

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(30ୡ݅ী ੉೧ೞח) Clean Architecture੄ ӝࠄ • MVCীࢲ Modelਸ ࠙೧ → Domain Layer + Data Layer • MVCীࢲ ࠺ૉפझ ۽૒ਸ ࠙೧ → Presentational Logic (in Presenter) / Domain Logic (in UseCase) ୹୊: https://qiita.com/koutalou/items/07a4f9cf51a2d13e4cdc

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• Ӓؘ۠, ই઱ ੘਷ ࠗ࠙୊ۢ ࠁ੉ח Presentation Logicী ઱۽ ઱ݾೞח ੉ਬח? • بݫੋ ۽૒੉ ର૑ೞח ࠗ࠙੉ (࢚؀੸ਵ۽) ੸਺ - ؀ࠗ࠙੄ জ੄ ҃਋, о੢ ࠂ ੟ೠ ࠺ૉפझ ۽૒਷ ߔূ٘ ࢲߡী ઓ੤ೣ • ࠂ੟ೞҊ (؀ࠗ࠙) ࠺زӝ੸ੋ ࢚క੄ ҙܻ, ӒܻҊ ۄ੉೐ ࢎ੉௿ োز੉ ഻ঁ ࠂ ੟ೞҊ ઺ਃೠ ޙઁ • ߄Լ ফӝೞݶ ݽ߄ੌ ইఃఫ୊ীࢲ о੢ ௾ դઁח tight coupling between ui and state changes ܳ যڌѱ ೧ࣗೡ Ѫੋо੄ ޙઁ

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ইఃఫ୊ ҙ੼ীࢲ ইې ف ѐ֛਷ ৵ Ӓܻ ઺ਃೠо? • పझ౟ оמࢿ • ੤ࢎਊࢿ    • “դ ਬ׫పझ౟ ٮਦ ೙ਃ হয!”ۄҊ ର݃ ݈ೞӝ ੹ী.. • Testablilityо ڄয૑ח ௏٘ۆ ޖ঺ੋо ࢤп೧ ࠇद׮ → Tightly-coupled • పझ౟ оמࢿ੉ ڄয૑ח ௏٘ח ઺ਃ ۄ੉࠳۞ܻ ߸҃, ӝ߈ ҳઑ ߸҃ী ؀਽ೞӝо য۵׮ • “അप੸ਵ۽ ೠ ߣ ૠ ௏٘ܳ ௿ېझ/Fragment ױਤ۽ ੤ࢎਊ оמೠ ҃਋о ঴݃ա ظ?”ۄҊ ର݃ ݈ೞӝ ੹ী.. • Re-usabilityۆ ѱ গୡী ޖ঺੉঻ա ࢤп೧ࠇद׮ → ੸੺ೠ ݽٕച, ஭ङച • ੤ࢎਊࢿ੉ ڄয૑ח ҳઑח ӝמ ߸҃ / ഛ੢ࢿ੉ ڄয૓׮ ≒ ௏٘ оةࢿ੉ ڄয૓׮

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ଵ औભ? ઑӘ੹ ৈ۞࠙਷ উ٘۽੉٘ ইఃఫ୊ ୡәҗ੿ਸ ࣻܐೞ࣑णפ׮.  

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Part II. Non-MVC ইఃఫ୊ ୨੿ܻ

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एযоח ௏ց.. ੉ۡ ٸ উ٘۽੉٘ ѐߊ੗ੋ ѱ ࠗՍۣ׮ যו զ,  ৖૘ ஘ҳ ইٜ ৖ ز֎ CTOܳ ݅աҊ ৡ ੉ࢎש੉  աܳ ࣑ࠗܰ׮.

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Fat Activity/Fragment - ݅ঈ੄ Ӕਗ ৈӝࢲ ੘֙੄ ࠂण: ৵ Android MVCח աࢂо? • Activityо ೡ ࣻ ੓ח ੌ • ۄ੉೐ࢎ੉௿ ҙܻ, ݽٚ UI ۽૒ - ۨ੉ইਓ ࢤࢿ, ۪؊݂, গפݫ੉࣌, Shared Preferences, ౵ੌ IO, ചݶ ੹ജ, ӂೠ ࢸ੿, Loader, Ӓ ৻ী ࣻ ߔ о૑ • ӝࠄ Android Architectureীࢲ Activityۆ? • Controller + View + alpha + omega = god • Fragmentب Ӓր ੘਷ नੌࡺ..

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Non-MVC੄ ࢸ҅ ੹ۚ • Non-MVCীࢲ Activityח ޖ঺ੋо? → Activityח ஶ౟܀۞! (ӒѪب ই઱ ઁೠ੸ੋ..) • MVP੄ (Ҿӓ੸) ੽Ӕߨ • Activityীࢲ View৬ Controller੄ ৉ೡਸ ୭؀ೠ ࡐ঒ই View৬ Presenter۽ ֈӣ.   Activityח ࣽࣻ ﬂow ҙܻ ৉ೡ ਤ઱ • MVVM/Redux ١੄ ੽Ӕߨ • ݃ଲо૑۽ Activityח ୭؀ೠ ੌࠗ context ੄ઓ ӝמ݅ ೞب۾..   View logic਷ ୭؀ೠ data bindingਵ۽ ҳഅ • ৈӝࢲ ੄ޙ: ৵ ҳӖ਷ (ߓ਋ӝب য۵Ҋ Rxо হਵݶ ઁ؀۽ ҳഅب উ غח) ViewModel݅ਸ AAC(Android Architecture Component)ীࢲ ૑ਗೞחо? • ӝઓ Activity/Fragment੄ ഋకܳ ӵڰܻ૑ ঋਵݶࢲ ੤ࢎਊࢿ/ࢤ࢑ࢿ ֫਷ ইఃఫ୊ܳ ҳഅ оמೞӝ ٸޙ* ※઱੄: য٣ө૑ա ୶ஏੑפ׮.

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Model-View-Presenter? • 1990֙؀ ୡ IBMীࢲ ୭ୡ۽ ҳഅ • 2006֙ Martin Fowler੄ ࣗѐ۽ օܻ ঌ۰૗  ଵઑ: GUI Architectures  https://martinfowler.com/eaaDev/uiArchs.html • ࢎप উ٘۽੉٘ ୡӝࠗఠ ҳ੹ਵ۽ ੹೧ઉ ৳؍ ইఃఫ୊ • Ӕؘ ੉޷ ೠޛ р ҳઑ ইצо? ই૒ب ॳաਃ? • ৘, ই૒ب ݆੉ ॺפ׮. ৘ܳ ٜݶ, э਷ ഥࢎоਃ.

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Presenter View Model ࢎਊ੗ ੑ۱ਸ ాࠁ ؘ੉ఠ јन ਃ୒ ؘ੉ఠ ߸҃ ాࠁ ࠭ ߸҃ ਃ୒ • ݽٚ Presentational Business Logicਸ Presenterীࢲ ୊ܻ • Viewח Presenter੄ ਃ୒ী ٮۄ ࣻز੸ਵ۽ UIܳ ୊ܻೣ

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Google Architecture Blueprint۽ ࠙ࢳ೧ࠁח MVP੄ ೨ब • https://github.com/googlesamples/android-architecture/tree/todo- mvp/ • Contractor Pattern • View, Presenterח interface ഋక۽ ࢲ۽ܳ ଵઑ • V৬ P੄ ҳഅ੉ ࢴ੉Ѣա, Pо ೒ۖಬ ੄ઓ੸ੋ APIܳ ૒੽ ੽Ӕೡ ৈ૑ܳ ਗୌ ࠉࣧ

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/** * This specifies the contract between the view and the presenter. */ public interface TasksContract { interface View extends BaseView { // ... void setLoadingIndicator(boolean active); void showTasks(List tasks); void showAddTask(); void showTaskDetailsUi(String taskId); } interface Presenter extends BasePresenter { // ... void loadTasks(boolean forceUpdate); void addNewTask(); void openTaskDetails(@NonNull Task requestedTask); void completeTask(@NonNull Task completedTask); void activateTask(@NonNull Task activeTask); void clearCompletedTasks(); void setFiltering(TasksFilterType requestType); TasksFilterType getFiltering(); } } • TODO জ੄ п ੘স(task)ܳ ࠁৈ઱Ҋ ୶о ೞח ചݶਸ ਤೠ TasksContractor interface ੿੄ • View-Presenter р੄ ૒੽ োѾਸ Ր਺ • Good?!

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• ׮द ೠ ߣ ੗ࣁ൤ ࠇद׮. • যۄ? Presenter੄ ݫٜࣗ٘ਸ ࠁפ ؘ ੉ఠܳ ֈѹ઱ח Ѫٜ੉ ੓֎? • Ӓۢ ࢚క ੿ࠁܳ Viewо ыח׮ח ফ ӝ?! /** * This specifies the contract between the view and the presenter. */ public interface TasksContract { interface View extends BaseView { // ... void setLoadingIndicator(boolean active); void showTasks(List tasks); void showAddTask(); void showTaskDetailsUi(String taskId); } interface Presenter extends BasePresenter { // ... void loadTasks(boolean forceUpdate); void addNewTask(); void openTaskDetails(@NonNull Task requestedTask); void completeTask(@NonNull Task completedTask); void activateTask(@NonNull Task activeTask); void clearCompletedTasks(); void setFiltering(TasksFilterType requestType); TasksFilterType getFiltering(); } }

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/** * Display a grid of {@link Task}s. User can choose to view all, active or completed tasks. */ public class TasksFragment extends Fragment implements TasksContract.View { private TasksContract.Presenter mPresenter; //... TaskItemListener mItemListener = new TaskItemListener() { @Override public void onTaskClick(Task clickedTask) { mPresenter.openTaskDetails(clickedTask); } @Override public void onCompleteTaskClick(Task completedTask) { mPresenter.completeTask(completedTask); } @Override public void onActivateTaskClick(Task activatedTask) { mPresenter.activateTask(activatedTask); } }; //... private static class TasksAdapter extends BaseAdapter { private List mTasks; private TaskItemListener mItemListener; public TasksAdapter(List tasks, TaskItemListener itemListener) { setList(tasks); mItemListener = itemListener; } } } • Bingo! - п ࢚కী ٮܲ కझ௼ܳ viewо ౸ױ೧ࢲ ࠁղ઱Ҋ ੓਺ • Ӓ item listenerܳ ഐ୹ೞח ࠗ࠙ਸ Ѣ ठ۞ ৢۄщ؊פ.. • Task ё୓੄ ࢚కܳ Viewо ыҊ ੓Ҋ, যڃ presenter ೣࣻо ഐ୹غযঠ ೡ ૑ ܳ View Ѿ੿ೠ׮?!

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• ೵?! ੉Ѥ MVPо ইפਗ਼ই! • Viewо passiveೞ૑ ঋ׮! • গୡী Activityо Controller, Fragment о View੄ ৉ೡਸ ೞب۾ ݅ٚ Ѫ ੗୓о, ੌ ੿ ӏݽ ੉࢚੄ জীࢲח ޙઁо ؼ ࣻ ੓ח ࢸ҅

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• ੉۠ য়೧ ٸޙী Martin Fowlerח Presenterۄח ੉ܴਸ ತӝೞҊ Supervising ControllerۄҊ ࠗܳ Ѫਸ ઁউ. (ӒܻҊ Viewח Passive View ۽ ܴࠗ) • Ref: Retirement note for Model View Presenter Pattern  https://martinfowler.com/eaaDev/ModelViewPresenter.html .

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؊ ੗ࣁೠ Ѥ… ৵ Viewח Passive ೧ঠೞחо, ӒܻҊ ߄ۈ૒ೠ View৬ Presenter੄ ৉ೡ਷ ޖ঺ੋо? ࣘदਗೞѱ ঌ۰٘݀פ׮… (ই݃ب)

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• ఋ ইఃఫ୊ীب ੸ਊغח ফӝ݅ ೞ੗ݶ, • Android੄ ҃਋, nested ҳઑ۽ т ࣻ߆ী হ਺. • Ӓۢ ҳӖ਷ ৵ ইఃఫ୊ ୒ࢎ૓ਸ ੉ۧѱ ૧ਸ ө? • ઱੄੼: ౠ੿ ഥࢎ੄ ҕध ࢠ೒਷ যڃ ੄بܳ о૑Ҋ ٜ݅য ૕ ࣻب ੓׮ח ੼ਸ ޷ܻ ৏ف ী ل ೙ਃо ੓਺ P V M Home MVP* P V M Banner MVP P V M Original List MVP P V M Preview List MVP ※઱੄: য٣ө૑ա ୶ஏੑפ׮.

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MVVM • MVVMীࢲ Viewח ־ҳੋо? • XML! DataBinding! • XMLী view logicਸ ನೣ   → Declarativeೠ UI ۽૒ ҳഅ੉ оמ  → BindingAdapter ઑ೤, RxJava/ RxBinding੄ ب਑ਵ۽ View੄ ࢚׼ࣻ ҳഅਸ Activity/Fragment۽ࠗఠ ࡐ঒ ই ৢ ࣻ ੓਺ http://kyubid.com/blog/understanding-mvvm-on-android-tutorial-05-introduction-to-reactive-programming-with-rxjava/

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• ViewModel • Ӓ ੗୓۽ ة݀੸ੋ दझమ • Viewী ੽Ӕೡ ࣻب হҊ, ઓ੤ ੗୓ب ݽܴ • AAC੄ ViewModel • LifeCycle ૑ਗ ӝמ ੉৻ী ౠ߹ೠ ӝמ হ਺ (ରӝ ߡ੹ীࢲب SavedStateо ୶оغח ੿ ب) • ૒੽ Life Cycle ୊ܻܳ ҳഅೞҊ AAC-ViewModelਸ ࢎਊೞ૑ ঋইب ޖߑ • Pro tip: MVVM ҳઑ ࢸݺীࢲ AAC Ӓܿࠗఠ աয়ח Ӗ੉ۄݶ ޺Ҋ Ѣܰदݶ ؾפ׮

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Redux - ୹ߊ੼ • Part I.ীࢲ ফӝ೮٠, ݽ߄ੌ জীࢲ о੢ ௾ դઁ ઺੄ ೞաח ࠂ੟ೠ ࢚క ٜਸ যڌѱ ӭՔೞҊ ਬ૑ࠁࣻࢿ ֫ѱ ҳഅೡ Ѫੋо੄ ޙઁ • ߊ࢚ਸ ߄Լࢲ জ ੹୓੄ ੉߮౟ܳ State Machineਵ۽ ୊ܻೠ׮ݶ যڄө? • Life Cycle ୊ܻ۽ Ҏݠܻ এਸ ੌ੉ әѺ൤ ઴যٝ • ࢚కী ٮۄ ׮ܰѱ ز੘ೞח UIܳ ࠁ׮ ૒ҙ੸ਵ۽ ҙܻ оמ • ౠ੿ചݶীࢲ ࣻ੿ ػ ղਊ (৘: “જইਃ” ࢚క ߸҃)੉ ׮ܲ Ҕীࢲ ੷੺۽ ੸ਊ

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• Ӓؘ۠.. • State Machineਸ ૒੽ ҳഅೞ׮ ࠁݶ.. п ۽૒੄ ୶࢚ചܳ যڌѱ ೡ ૑ ݆਷ Ҋ޹ ਸ ೞѱ ؽ • ࢚క: ݢ੷ ࢚కܳ ੷੢ೞח ࠗ࠙਷ ࠁా enum class ইפݶ, sealed class۽ ҳഅ • ࢚క ୌ੉(transition/ﬂow): যڃ ઑѤীࢲח B۽, ژ ׮ܲ ઑѤীࢲח C۽ ߸҃ • ۽૒ ࣻ೯: п ࢚కо ߸҃ غ঻ਸ ٸ ࣻ೯೧ঠೡ पઁ ۽૒ • ਤ ࣁ ਃࣗ੄ ࠂ੟بী ٮۄ ࢚ടী ݏѱ ҳഅ೧ঠೞ૑݅ о੢ ߧਊ੸ੋ ߑߨ ઺ ೞա ח uni-directionalೠ pipeline ഋక -> ߄۽ Flux ҳઑ!

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MVI? Flux? Redux? • Flux: Facebookীࢲ, ਢ ೐ۿ౟ূ٘੄ ࢚క ୊ܻܳ ૒ҙ੸੉Ҋ ӭՔೞѱ ೞӝ ਤ ೧ Ҋউೠ Architectural Pattern. ױߑೱ੄ pipelined loopܳ ా೧ ੉߮౟ܳ ୊ܻ • MVI: Fluxী View ୊ܻ ١ ݽ߄ੌ ҙ۲ ղਊਸ ୶о೧ࢲ ࠗܰח ੉ܴ. উ٘۽੉٘ ѐߊীࢶ Flux৬ э਷ ਊযۄҊ ࢤп೧ب ޖߑ • Redux: Flux ಁఢ੄ ߸ഋ ҳഅ୓ ઺ о੢ ബਯ੸੉ۄҊ ঌ۰૓ ҳഅ୓. (ޛۿ Java Script۽..) - immutable state, single source of truthܳ पഅೠ ױࣽೠ ҳഅ • Dan Abramovۄח ੻਷ ѐߊ੗о Ҋউ. 100ৈ ઴ী ࠛҗೠ ۄ੉࠳۞ܻ۽ ݽٚ Flux ҳഅ୓ܳ ಣ੿ -> ﬂux ਗ Ҋউ੗ীѱ ੋ੿ ߉਷ റ, ߄۽ Facebookীࢲ झ ஠ਓ

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• Action: ࢚కܳ ߸҃ೞۄח ݺ۸݅ਸ о૗ • ࠁా਷ Action Creatorܳ ా೧ ٜ݅য૗ • State: ࢚క੄ ؘ੉ఠ݅ਸ о૗. no logic • immutable (ﬂuxח mutable) • Store • ࢚క੄ ੷੢ࣗ • ࢚కܳ ߸҃दఃҊ, ా૑ ೞח ৉ೡ • RxJava ഑਷ Coroutineਵ۽ ࣚऔѱ ҳഅ оמ • Reducer • ࣽࣻ ೣࣻ(pure function) ഋక۽ ࢚క ߸҃ਸ ҳ അ: (State, Action) -> new State Ӓܿ ୹୊: https://speakerdeck.com/yuyakaido/droidkaigi-2019

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Ӓۢ side eﬀect ୊ܻח ؀୓ ־о? → Middleware! Ӓܿ ୹୊: https://speakerdeck.com/yuyakaido/droidkaigi-2019

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Redux੄ ੢ױ੼ • ੢੼ • ࢚క ୊ܻীࢲ੄ ۄ੉೐ ࢎ੉௿੄ ৔ೱਸ যו ੿ب ߓઁೡ ࣻ ੓਺ • ചݶীࢲ back ߡౡ ־ܲ റী ٍןѱ ߊࢤೠ API ী۞.. э਷ গݒೞҊ դ೧ೠ ࢚ടب ബҗ੸ਵ۽ ؀୊ оמ • ࢚క੄ ੿੄ ࠗ࠙, ੷੢ ࠗ࠙, ୊ܻ ࠗ࠙੉ ৮߷൤ աׇઉ ੓ӝ ٸޙী ࣻ੿/ഛ੢੉ ӓب۽ ಞೣ • Functionalೠ ҳઑ੄ ౠࢿ࢚ ਬ׫ పझ౟ܳ ੘ࢿೞח Ѫ੉ ӓب۽ ಞܻೣ • Debugging੄ नࣁ҅! അ੤੄ ݽٚ ੹৉੸ ࢚కܳ ഛੋೡ ࣻ ੓Ҋ, ࢚క ߸ࣻ чਸ ૒੽ ࣻ੿೧ࢲ ੹୓ ࢚కܳ ߄Լࠅ ࣻب ੓਺ • ױ੼ • ࢚׼ೠ ࣻળ੄ ೟ण ࠺ਊ੉ ࣗਃ • ௏٘۝ ૐо, ౠ൤ boiler plate ௏٘੄ ߈ࠂ੸ ࢤ࢑਷ ೖೞӝ য۰਑

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Flux / Redux੄ അ੤৬ ޷ې • അ੤ • ReKotlin, RxRedux੉ ੓ਵա അ੤۽ࢶ ૒੽ ҳഅਸ ୶ୌ • State / Action੄ ੽੼ਸ View۽ ೡ ࣻب ੓૑݅ ViewModel۽ب оמ • ӒܻҊ Flux੄ ҃਋ח Storeܳ ViewModel۽ ҳഅ! • RxJava۽ Store, ӒܻҊ side eﬀectܳ ୊ܻೞח middlewareܳ ҳഅ vs Coroutine + LiveData ઑ೤ • ޷ې? • Rxܳ Ҷ੉ ॳ૑ ঋইب غח use caseо ؀ࠗ࠙੉Ҋ, coroutine ജ҃੉ ࢿࣼ/উ੿ച ؽী ٮۄ әѺ൤ coroutineਵ۽ ઺ब੉ ֈযт ٠ • അ੤ ઱ܨੋ Redux-Thunk middlewareܳ Redux-Sagaо ؀୓ೡ Ѫਵ۽ ৘࢚ • Coroutineҗ ৮߷ೞѱ ݒ஖ غח async loop ҳઑ • ӓب۽ ইܴ׹Ҋ ӭՔೠ పझ౟ ௏٘ ੘ࢿ оמ

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Part III.   New Trends in 2019

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1. Multi-module! • ৈӝࢲ ਫ਼द ૕ޙ • internal class (inner class ইש) ੉ ޖ঺ੋ૑ ইदաਃ? • private / protected / internal / public ઺ internal - public੄ ର੉ח? • internal ध߹੗ -> ׮ܲ module (packageо ইש) ীࢲ ࠁ੉૑ ঋѱ ೣ • android gradle plugin 3.0.0ࠗఠ compile -> implementationਵ۽ ߄Ո ੉ਬ о ޖ঺ੋ૑ ইदաਃ? • ݣ౭ ݽٕ ૑ਗ ӝמ੉ ъച غݶࢲ ୶оػ ѐ֛ • ੿ഛ൤ח, compile == api ۽ ߄Պ

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ଵઑ оמ • Compile (== api) ध߹੗ • ౠ߹൤ ૑੿ೞ૑ ঋইب ࣚ੗ ݽٕө૑ ଵઑ оמ • ߄Լ ফӝೞݶ, module2о ߸҃੉ غ ݶ app ݽٕب ੤ஹ౵ ੌ ೧ঠೣ Ӓܿ ୹୊: https://speakerdeck.com/sansanbuildersbox/multi-module-android-application

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ଵઑ ࠛо • implementation ध߹੗ • ݺद੸ਵ۽ ૑੿ೞ૑ ঋ ਷ ࣚ੗ ݽٕ ଵઑ ࠛо • ߄Լ ফӝೞݶ, module2о ߸҃੉ غ যب app ݽٕ਷ ஹ౵ ੌೡ ೙ਃо হ਺ Ӓܿ ୹୊: https://speakerdeck.com/sansanbuildersbox/multi-module-android-application

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• ݣ౭ ݽٕ਷ ৵ ॳחо? • അप੸ੋ ੉ਬ: ࠽٘ ࣘب • ಽ ࠽٘: 36.4s → 30s, incremental build: 14.2s → 7s • Ref: https://speakerdeck.com/sansanbuildersbox/multi-module-android- application • ৵? ઱ػ ੉ਬח annotation processing. kapt੄ ҃਋ח ই૒ب incremental processingਸ ૑ਗೞ૑ ঋ਺. • Ӓ৻ realmҗ э੉ byte code weavingਸ ೞח ۄ੉࠳۞ܻܳ ߹ب ݽٕ۽ ࡐח Ѫ ݅ਵ۽ 30% ࠽٘ ࢿמ ೱ࢚ • ബਯ੸ੋ ࠙স ೐۽ࣁझ оמ: ݽٕ ߹۽ ҳഅ੄ Ѻܻ / పझ౟о оמ • ة݀੸ੋ ࢸ҅ܳ ୢ૓

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• ݽٕ਷ যڌѱ ա־חо? - (1) Layer ߹ ࣻ૒ ܻ࠙ • Presentation / Domain / Data Layer • ױ, Applicationীࢲ DBܳ ࢤࢿ೧ঠ ೞӝ ٸޙী, P -> D -> L ഋక੄ ߓ஖ח ࠛоמ • app਷ DIܳ ੿੄, ui / data ݽٕী domain ݽٕ੉ ઱ੑؼ ࣻ ੓ب۾ ೣ Ӓܿ ୹୊: https://speakerdeck.com/sansanbuildersbox/multi-module-android-application

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• ݽٕ਷ যڌѱ ա־חо? - (2) ࣻಣ ܻ࠙ • ചݶ߹ / ӝמ߹۽ ܻ࠙ → feature߹ ة݀ࢿ ഛࠁ • ੄ઓࢿ ӝળ ܻ࠙: Realm ١ black magic ҅੄ ӝࣿ੉ ࢎਊػ ࠗ࠙਷ ӓ۱ ߹ب ݽٕ۽ ܻ࠙ • Eg. SanSan Eight App੄ ҃਋, realm object੄ ߹ب ݽٕ ܻ࠙݅ਵ۽ ಽ ࠽٘ दр੉ 6m 46s → 4m 27s • ઱੄੼: ࢚ഐ ଵઑ • উ٘۽੉٘ ݽٕ੄ ଵઑח ױߑೱ݅ ೲਊೞ޲۽ নߑೱ੄ ଵઑо ࠛо • ف ѐ੄ ചݶ੉ п੗ ࢲ۽ܳ द੘ೡ ࣻ ੓ח ҃਋ח, п੗੄ intentܳ оઉঠ ೞ޲۽ ܻ࠙о ࠛоמ೧૗ • Intent ࢤࢿ ੋఠಕ੉झ݅ਸ ыҊ ҳഅ਷ ୭࢚ਤ ݽٕ(:app)੉ ࣗਬ → DI۽ ঳যয়ӝ • ઺ঔ૘઺ध navigation ௿ېझܳ ٜ݅Ҋ п ݽٕ਷ ੋఠಕ੉झ݅ ыب۾ ҳഅ (DroidKaigi 2018 জ ଵઑ) • Tip: Daggerܳ ੉ਊೠ ઱ੑ + ࢎਊ੗ ౵ۄ޷ఠо زदী ೙ਃೠ ҃਋ۄݶ, AssistedInjection ਸ ࢎਊ

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؊ ੗ࣁೠ Ѥ…

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• Dependency Inversion: ੉ઁө૑ Androidীࢲ ઺ਃद ػ ੸ হ؍ ࢸ҅ ਗ஗ • ࢚ਤ ݽٕ਷ ೞਤ ݽٕী ੄ઓࢿ੉ ੓যࢲח উ ػ׮ & ࢚ਤ ݽٕ ೞਤ ݽٕ ݽف ੋఠಕ੉झী݅ ੄ઓೠ׮ • A ё୓о B ё୓੄ ۨಌ۠झܳ ૒੽ ଵઑೞח ؀न, interfaceܳ ଵઑೞৈ ҳഅ ੄ઓࢿਸ Ր਺ • Bо ߸҃غযب Aח ஹ౵ੌೡ ೙ਃо হ਺ • زੌೠ ੋఠಕ੉झܳ ы૑݅ ੹ഃ ׮ܲ ۽૒ਵ۽ ҳഅػ ઁ3੄ ݽٕ۽ औѱ ߸҃ оמ   → Dependency Injection੄ ب਑ਸ ߉ਵݶ п ݽٕ ߹ ࢸ੿ਸ ੌҙػ ߑधਵ۽ ࣚऔѱ ࣻ੿ оמ

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੄ઓࢿ ઱ੑী ؀೧ ೡ ݈਷ ݆૑݅..

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2. RxJava vs Coroutine vs LiveData • ৵ ೙ਃೠо? • Reactive: ࠺زӝ੸ੋ ୊ܻܳ imperativeೞѱ ୊ܻೡ ࣻ ੓ѱ ೧ષ • RxJava • ৈ੹൤, Androidীࢲ੄ ࠺زӝ ୊ܻ ਤೠ അઓೞח о੢ ъ۱ೞҊ ಞܻೠ ࣻױ • Androidীࢲ੄ ࠂ੟ೠ ࢚క୊ܻܳ ૒ҙ੸ਵ۽ ҳഅ оמ • View - ViewModelҗ੄ оҮܳ ਤೠ black magic झ۞਍ ׮নೠ ҳഅب оמ • eg. ࢚ടী ٮۄ ࣽର੸ਵ۽ प೯೧ঠ ೞח গפݫ੉ٜ࣌ਸ пп Completable۽ ੿੄ೠ റ, Combine೧ࢲ प೯

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• ੉۠ Ѫب оמ! • ViewGroup੄ ઺੼੉ ߄Չ ٸ݃׮ ViewModel੉ ా૑ܳ ߉ਸ ࣻ ੓ب۾ View ஏীࢲ ഐ୹ೡ ࣻ ੓ח ೾ಌ ೣࣻ internal fun createVerticalCenterPublisher(layout: View): Observable = Observable.create { emitter -> emitter.onNext(layout.bottom - layout.top) val callback = View.OnLayoutChangeListener { _, _, top, _, bottom, _, _, _, _ -> emitter.onNext(bottom - top) } layout.addOnLayoutChangeListener(callback) emitter.setCancellable { layout.removeOnLayoutChangeListener(callback) } }.subscribeOn(AndroidSchedulers.mainThread()) .throttleLatest(100, TimeUnit.MILLISECONDS, true) .map { it / 2 }

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؊ ੗ࣁೠ Ѥ… ೵!? Ӓ ݺъ੄ܳ উ ٜ঻׮Ҋਃ?! YouTube ׮दࠁӝܳ ъ୶٘݀פ׮.

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Coroutine • ޤо જ਷о? • ࢿמ ੉੼: coroutine is light-weight threads • Rxࠁ׮ ؏ য۵׮ • ࠁ׮ functionalೠ ҳഅ - Saga ಁఢ э਷ ഋక੄ ҳഅী ఌਘ • ੉ઁח উ੿ӝী ੽যٜ঻਺ - Kotlin 1.3җ ೣԋ ੿ध ߡ੹੉ غ঻Ҋ, ୭न ࢎনী ݏ୸ ׮নೠ ૑ ਗ੉ ৘੿غয ੓਺. • lifecycle-viewModel-ktx 2.1.0 (അ੤ alpha03)ࠗఠ lifecycle-awareೠ Coroutine Scope ੋ viewmodelScopeܳ ҕध ૑ਗ • retroﬁt ରӝ ߡ੹ীࢲ “suspend fun”ਸ ഋక۽ api interface ੿੄ оמ (അ੤ “Deferred”ܳ ܻఢೞח ഋక)

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؊ ੗ࣁೠ Ѥ… ૑Ә੉ۄب ן૑ ঋওणפ׮. ৖ ъ੄प۽ ҊҊ~ ☺

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LiveData • LiveDataী ؀೧ ֤ೞӝ ੹ী.. • View - ViewModel (or Presenter) р੄ ੉߮౟ ా૑ী ੓যࢲ о੢ ੉࢚੸ੋ ੉ ߮౟ ా૑ ੹׳੗ח যڃ ౠ૚ਸ оઉঠೡө? • ੉߮౟ ੹׳੉ UI झۨ٘ীࢲ ੉ܞઉঠ ೠ׮ • Side Eﬀect੄ ҕਬо оמ೧ঠೠ׮. -> ए਍ ݈۽ ೞݶ ೞա੄ ੉߮౟ܳ ৈ۞ ੉ ߮౟ ೩ٜ۞о ҕਬೡ ࣻ ੓যঠ ೠ׮ • ী۞ܳ skip ೡ ࣻ ੓যঠ ೠ׮ • → RxSwift੄ ҃਋, Signal/Driverо ੉ী ೧׼

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• LiveData੄ ౠ૚ • ӝࠄ੸ਵ۽ UI threadীࢲ ز੘ • Side Eﬀect(ч੄ ߸ച, ੉߮౟)੄ ҕਬо оמ • Conﬁguration ߸҃ द ݃૑݄ ߊࢤೠ ੉߮౟ܳ replay ೧ષ (ױ, ੄ب஖ ঋ਷ ߡӒо ࢤӡ ৈ૑ ੓਺) • transformationਸ ా೧ RxJava੄ combineҗ ࠺तೞѱ ҳഅ оמ • → RxSwift੄ Driver৬ ਬࢎೠ ѐ֛ + LifeCycle-awareness • LiveDataח ঱ઁ ॳחо? • Rx੄ ؀୓੤о ইצ ࠁ৮੤ • DataBinding ਊب۽ח ୶ୌೞ૑ ঋ਺

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Part IV.   Best Examples

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ࢶ੿ ઑѤ • জ ӏݽ: Toy projectо ইפҊ पઁ Play Storeী ৢۄৡ জੋо • ࢸ҅: Clean Architecture ١੉ ੜ ੸ਊغয ੓חо • పझ౟: Unit Testо ਃࣗਃࣗ ੜ ҳഅغয ੓חо • ௏٘ ಿ૕: ղ ೐۽ં౟ীب ы׮ ॶ݅ೠ ಴അ੉ ݆਷о

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Google IO 2018 • https://github.com/google/iosched • Clean Architecture - Domain layer੄ UseCase ҳഅ ߂ పझ౟ • LiveData ࢎਊ੄ ૓ࣻ: RxJava ইפݶ উ ؼ Ѫ э਷ ӝמٜө૑ب ކٶ MediatorLiveData۽ ҳഅ! • ઱੄ೡ ੼: LiveDataܳ पઁ۽ ੷ۧѱ ॳח Ѫ਷ ӓ۱ ࠺୶ୌ • ӝఋ ইఃఫ୊ ৻੸ਵ۽ ࣁࠗ ௏٘ ҳഅী ଵҊೡ ੼੉ ݒ਋ ݆਺

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DroidKaigi 2018 • https://github.com/DroidKaigi/conference-app-2018 • о੢ ݽߧ੸ੋ MVVM ҳઑ • о੢ ഴܯೞҊ ӭՔೠ Dagger ੿੄ • Domain ۽૒਷ Data ۨ੉য੄ Repository ಁఢਵ۽ ҳഅ • NavigationController - ݒ਋ ഴܯೠ coordination ؀উ • gradle kts

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DroidKaigi 2019 • https://github.com/DroidKaigi/conference-app-2019 • ݣ౭ ݽٕ ҳഅ • + iOSب ૑ਗ • Flux ҳઑ • Dagger ഛ੢ • AssistInjection! • ୭न UI ҳഅ! - Custom LayoutManager੄ જ਷ ৘ܳ ࠅ ࣻ ੓׮!

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I’ll be back! • DroidKnights 2020 উ٘۽੉٘ ইఃఫ୊ ࣁߣ૩ दܻૉ۽ جই২פ׮.   ղਊ਷ ই݃ب.. • Coroutine + Arrow۽ ҳഅೠ functionalೠ Redux ҳઑ बக ࠙ࢳ • ؀ӏݽ Multi-module ೐۽ં౟ ҳ୷ • Dagger ࢎਊಁఢ ୨੿ܻ • (ѐ੼ോস ઺੉؍) ࠶۽Ӓ ੤ѐ೤פ׮! - 4/20ࠗఠ • पઁ ೐۽ં౟ীࢲ ੄޷੓ח Test-Driven Development • Dagger 2 Dependency Injection ҳഅ ੹ۚ ୨੿ܻ ъࢎܕ Email: justfaceit@gmail.com Blog: https://medium.com/@justfaceit Slide: https://speakerdeck.com/saryong