DroidKaigiカンファレンスアプリの歴史からみるアプリアーキテクチャのこれまでとこれから

DroidKaigi2021 Day2 発表資料です。
DroidKaigi2015から2021までのカンファレンスアプリを主にアーキテクチャの点から比較し、どのような技術に置き換わっていったのか・未来のアプリ開発のデファクトスタンダードはどうなるのかを知ることができます。

https://droidkaigi.jp/2021/timetable/?day=2

Transcript

1. %SPJE,BJHJΧϯϑΝϨϯεΞϓϦͷ
   ྺ࢙͔ΒΈΔ
   ΞϓϦΞʔΩςΫνϟͷ
   ͜Ε·Ͱͱ͜Ε͔Β
   ,B[VLJ$IJHJUB DIJHJDIBO
   
   "The Android robot is reproduced or modified from work created and shared by Google and
   used according to terms described in the Creative Commons 3.0 Attribution License."
   DroidKaigi2021
   

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2. Speaker
   ,B[VLJ$IJHJUB chigichan24
   
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   ܧଓతʹػೳ։ൃΛਐΊͳ͕Βߦ͏ϚϧνϞδϡʔϧԽ
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   ”Twemoji” ©Twitter, Inc and other contributors (Licensed under CC-BY 4.0) https://twemoji.twitter.com/
   

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3. Break the Ice
   2%SPJE,BJHJΧϯϑΝϨϯεΞϓϦ͕͋Δͷ஌ͬͯ·͔ͨ͠ʁ
   ͦΜͳ΋ͷ͕͋ͬͨͷ͔ʂ
   ࠓ͸͡Ίͯ஌Γ·ͨ͠
   ΋ͪΖΜ஌ͬͯΔΑ
   Πϯετʔϧͯ͠ΔΑ
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   ࢲ͕99ը໘ͷ࡞ऀͰ͢
   ഑৴αΠτ΍5XJUUFSͰίϝϯτͯ͠Ͷʙ
   ”Twemoji” ©Twitter, Inc and other contributors (Licensed under CC-BY 4.0) https://twemoji.twitter.com/
   

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4. ࣌఺ͷεΫϦʔϯγϣοτɾಈըͰ͢
   

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7. Androiod iOS
   ࣌఺ͷεΫϦʔϯγϣοτͰ͢
   

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9. എܠͱൃදͰ
   ໨ࢦ͢ΰʔϧ
   ֤೥ͷ
   ηογϣϯ
   ৘ใऔಘը໘
   ࣮૷
   ೥ͷ
   %,BJHJΞϓϦ
   ͔Βඥղ͘
   ະདྷͷ
   σϑΝΫτ
   Section 1 Section 2 Section 3
   Agenda
   

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10. എܠͱൃදͰ
    ໨ࢦ͢ΰʔϧ
    ֤೥ͷ
    ηογϣϯ
    ৘ใऔಘը໘
    ࣮૷
    ೥ͷ
    %,BJHJΞϓϦ
    ͔Βඥղ͘
    ະདྷͷ
    σϑΝΫτ
    Section 1 Section 2 Section 3
    Agenda
    

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11. (Section1)
    Background and
    purpose of this
    presentation
    ͜ͷηΫγϣϯͷ໨త
    ϓϨθϯશମͷഎܠɾ໨తɾ
    ΰʔϧΛڞ༗͢Δɻ
    ͜Μͳʹ΋มԽ͍ͯ͠Δͷ͔ʂͷ
    ڻ͖Λڞ༗͢Δɻ
    

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12. (Section1) Background & Goal
    2021
    2015
    

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13. (Section1) Background & Goal
    2016 2021
    VS
    

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14. 2016 2021
    In Google I/O 2017, the Android team announced
    first-class support for Kotlin.
    Main Language JAVA Kotlin
    Supported
    Platform
    Android
    Android
    iOS
    web
    Main Libraries
    Jetpack Compose
    rxjava1
    Android-Orma
    Dagger2
    Kotlin Coroutines & Flows
    Hilt
    

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15. 2016 2021
    In Google I/O 2017, the Android team announced
    first-class support for Kotlin.
    Main Language JAVA Kotlin
    Supported
    Platform
    Android
    Android
    iOS
    web
    Main Libraries
    Jetpack Compose
    rxjava1
    Android-Orma
    Dagger2
    Kotlin Coroutines & Flows
    Hilt
    ΊͪΌͪ͘Ό
    มԽ͍ͯ͠Δ
    

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16. (Section1) Background & Goal
    ΧϯϑΝϨϯεΞϓϦͷྺ࢙Λඥղ͍ͯ೔ʑͷ։ൃͷώϯτʹ͠Α͏
    ະདྷͷ"OESPJEΞϓϦ։ൃͷσϑΝΫτΛײ͡Α͏
    

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17. (Section1) Background & Goal
    ΧϯϑΝϨϯεΞϓϦͷྺ࢙Λඥղ͍ͯ೔ʑͷ։ൃͷώϯτʹ͠Α͏
    ະདྷͷ"OESPJEΞϓϦ։ൃͷσϑΝΫτΛײ͡Α͏
    ࣌୅͕มԽ͢Δத
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    ϥΠϒϥϦ
    ΞʔΩςΫνϟ͸
    Ͳ͏มΘͬͨͷ͔Λ஌Δ
    

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18. (Section1) Background & Goal
    ΧϯϑΝϨϯεΞϓϦͷྺ࢙Λඥղ͍ͯ೔ʑͷ։ൃͷώϯτʹ͠Α͏
    ະདྷͷ"OESPJEΞϓϦ։ൃͷσϑΝΫτΛײ͡Α͏
    ࣌୅͕มԽ͢Δத
    ࣮૷ͷτϨϯυ
    ϥΠϒϥϦ
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    ௕ظؒϝϯς͞Ε͍ͯΔ
    ػೳͷ࣮૷ஔ͖׵͑
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    ͷ
    ಓඪΛ୳Δ
    

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19. (Section1) Background & Goal
    ΧϯϑΝϨϯεΞϓϦͷྺ࢙Λඥղ͍ͯ೔ʑͷ։ൃͷώϯτʹ͠Α͏
    ະདྷͷ"OESPJEΞϓϦ։ൃͷσϑΝΫτΛײ͡Α͏
    ࣌୅͕มԽ͢Δத
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    ϥΠϒϥϦ
    ΞʔΩςΫνϟ͸
    Ͳ͏มΘͬͨͷ͔Λ஌Δ
    ௕ظؒϝϯς͞Ε͍ͯΔ
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    ͷ
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    ඞཁʹͳΔ஌ࣝ
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    ײ͡Δ
    

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20. എܠͱൃදͰ
    ໨ࢦ͢ΰʔϧ
    ֤೥ͷ
    ηογϣϯ
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    ࣮૷
    ೥ͷ
    %,BJHJΞϓϦ
    ͔Βඥղ͘
    ະདྷͷ
    σϑΝΫτ
    Section 1 Section 2 Section 3
    Agenda
    

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21. എܠͱൃදͰ
    ໨ࢦ͢ΰʔϧ
    ֤೥ͷ
    ηογϣϯ
    ৘ใऔಘը໘
    ࣮૷
    ೥ͷ
    %,BJHJΞϓϦ
    ͔Βඥղ͘
    ະདྷͷ
    σϑΝΫτ
    Section 1 Section 2 Section 3
    Agenda
    

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22. (Section2)
    Implementation
    difference of each
    years
    ͜ͷηΫγϣϯͷ໨త
    ֤೥ͷ࣮૷Λ؆୯ʹཧղ͠ɺ
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    ͜Μͳʹ΋มԽ͍ͯ͠Δͷ͔ʂͷ
    ڻ͖Λڞ༗͢Δɻ
    

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23. (Section2) Implementation Diff
    ҎԼͷ؍఺͔Β֤೥ͷηογϣϯৄࡉϖʔδͷ࣮૷Λൺֱͯ͠ΈΑ͏
    ओཁϥΠϒϥϦ
    ΞʔΩςΫνϟ
    ઃܭํ਑ͳͲ
    ࣌୅എܠ ֤छTUBUT
    

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24. View Slide

25. TUBUT 1SJWBUF ਓ
    +BWB"OESPJEPOMZ
    ΞʔΩςΫνϟ .7$ͬΆ͍
    ࣌୅എܠ
    %SPJE,BJHJ͕Ͱ͖ͨ೥ɻ
    "OESPJEYܥ͕͡Θ͡Θͱਁಁ
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    'SBHNFOU
    "DUJWJUZ
    QSJWBUFͳͷͰϥΠϒϥϦৄࡉ͸Θ͔Γ·ͤΜ
    
    2015
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26. 2015
    ύοέʔδ͸ػೳɾը໘͝ͱͱ͍͏ΑΓ΋ɺ
    ໾ׂʹؔ͢ΔϨΠϠ͝ͱ
    "DUJWJUZ'SBHNFOU΋ඇৗʹ؆ܿ
    

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27. 2015
    ύοέʔδ͸ػೳɾը໘͝ͱͱ͍͏ΑΓ΋ɺ
    ໾ׂʹؔ͢ΔϨΠϠ͝ͱ
    "DUJWJUZ'SBHNFOU΋ඇৗʹ؆ܿ
    γϯϓϧͳ6*ͱͦΕΛ࣮ݱ͢Δ
    γϯϓϧͳΞʔΩςΫνϟ
    

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28. View Slide

29. 2016
    TUBUT 044 ਓ
    +BWB"OESPJEPOMZ
    ΞʔΩςΫνϟ .7$
    ࣌୅എܠ
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    "OESPJEYܥͷ࣌୅
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    %BHHFS
    "OESPJE0SNB
    0L)UUQ
    3FUSPGJU
    4UFUIP
    %BUB#JOEJOH
    

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30. 2016
    Activity
    Fragment
    xml
    DAO
    Model
    ActivityNavigator
    DataBinding
    Orma
    API
    Retrofit + OkHttp
    Observable(RxJava1)
    Call
    startActivityॲཧΛ୲͏
    callback
    Call
    

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31. 2016
    Activity
    Fragment
    xml
    DAO
    Model
    ActivityNavigator
    DataBinding
    Orma
    API
    Retrofit + OkHttp
    Observable(RxJava1)
    Call
    startActivityॲཧΛ୲͏
    callback
    Call
    Model
    View
    Controller
    

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32. 2016
    Activity
    Fragment
    xml
    DAO
    Model
    ActivityNavigator
    DataBinding
    Orma
    API
    Retrofit + OkHttp
    Observable(RxJava1)
    Call
    startActivityॲཧΛ୲͏
    callback
    Call
    Model
    View
    Controller
    ංେԽ
    ෳࡶԽ
    

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33. 2016
    Dagger2ʹΑΔInjectionͷ༷ࢠ
    

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34. 2016
    Dagger2ʹΑΔInjectionͷ༷ࢠ
    ΞʔΩςΫνϟʹΑΔ໾ׂ෼ׂ
    $POUSPMMFSɾ.PEFMͷංେԽ
    

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35. View Slide

36. 2017
    TUBUT 044 ਓ
    +BWB,PUMJO "OESPJEPOMZ
    ΞʔΩςΫνϟ .77. 3FQPTJUPSZQBUUFSO
    ࣌୅എܠ
    ,PUMJO͕GJSTUTVQQPSUMBOHVBHFͱൃදɻ
    "OESPJEYܥͷ࣌୅
    NVMUJXJOEPXNPEFͷొ৔
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    3Y+BWB
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    0L)UUQ
    3FUSPGJU
    4UFUIP
    %BUB#JOEJOH
    1FSNJTTJPO%JTQBUDIFS
    

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37. 2017
    Model
    Single/Maybe/Completable
    (RxJava2)
    Activity
    Fragment
    xml
    DataBinding
    LocalDataSource
    Orma
    RemoteDataSource
    Retrofit + OkHttp
    Repository
    ViewModel
    call
    call
    call
    

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38. 2017
    Model
    Single/Maybe/Completable
    (RxJava2)
    Activity
    Fragment
    xml
    DataBinding
    LocalDataSource
    Orma
    RemoteDataSource
    Retrofit + OkHttp
    Repository
    ViewModel
    call
    call
    call
    Model
    View
    ViewModel
    Repository
    

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39. 2017
    Model
    Single/Maybe/Completable
    (RxJava2)
    Activity
    Fragment
    xml
    DataBinding
    LocalDataSource
    Orma
    RemoteDataSource
    Retrofit + OkHttp
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    call
    call
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    ViewModel
    Repository
    ੍ޚ೉
    

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40. View Slide

41. 2017
    खಈͰ։์͠ͳ͍ͱԿ͕ى͖Δ͔Θ͔Βͳ͍
    Jetpack (AAC) ViewModel ͕·ͩଘࡏ͠ͳ͍
    

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42. "OESPJEΞϓϦઃܭύλʔϯೖ໳
    ୈষʮ044ʹ͓͚Δઃܭऀͷ໾ׂʯ
    ʢখ੢༟հ!LPOJGBSʣ
    2017
    ͋ΘͤͯಡΈ͍ͨ
    

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43. "OESPJEΞϓϦઃܭύλʔϯೖ໳
    ୈষʮ044ʹ͓͚Δઃܭऀͷ໾ׂʯ
    ʢখ੢༟հ!LPOJGBSʣ
    2017
    ͋ΘͤͯಡΈ͍ͨ
    .77.ʹΑΔΞϓϩʔν
    ϥΠϑαΠΫϧϋϯυϧͷ೉͠͞
    

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44. View Slide

45. 2018
    TUBUT 044 ਓ
    ,PUMJO"OESPJEPOMZ
    ΞʔΩςΫνϟ .77. 3FQPTJUPSZQBUUFSO
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    %BHHFS
    3PPN
    0L)UUQ
    3FUSPGJU
    (SPVQJF
    %BUB#JOEJOH
    "OESPJE ,59
    

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46. 2018
    Model
    Single/Maybe/Completable/Flowable
    (RxJava2)
    Activity
    Fragment
    xml
    DataBinding
    Database
    Room
    API
    Retrofit + OkHttp
    Repository
    ViewModel
    call
    call
    call
    LiveData
    

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47. 2018
    Model
    Single/Maybe/Completable/Flowable
    (RxJava2)
    Activity
    Fragment
    xml
    DataBinding
    Database
    Room
    API
    Retrofit + OkHttp
    Repository
    ViewModel
    call
    call
    call
    LiveData
    data
    View
    ViewModel
    Repository
    

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48. 2018
    Model
    Single/Maybe/Completable/Flowable
    (RxJava2)
    Activity
    Fragment
    xml
    DataBinding
    Database
    Room
    API
    Retrofit + OkHttp
    Repository
    ViewModel
    call
    call
    call
    LiveData
    data
    View
    ViewModel
    Repository
    ,PUMJOʹΑΔදݱͷγϯϓϧԽ
    ""$ͷ୆಄
    7JFX.PEFMͷංେԽɾ
    7JFXͷෳࡶԽ
    

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49. View Slide

50. 2019
    TUBUT 044 ਓ
    ,PUMJOɾ4XJGU"OESPJEɾJ04
    ΞʔΩςΫνϟ 'MVY3FQPTJUPSZ.VMUJ.PEVMF
    ࣌୅എܠ
    ,PUMJO$PSPVUJOFT͕੮ר
    "OESPJEYܥͷ࣌୅
    ϊονελΠϧͷσΟεϓϨΠ
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51. 2019
    Dispatcher
    Database
    Room
    API
    Ktor-client
    ActionCreator
    xml
    Store
    Fragment
    Repository
    suspend call
    DataBinding
    BroadcastChannel
    suspend call suspend call
    suspend call
    LiveData
    call
    

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52. Dispatcher
    Database
    Room
    API
    Ktor-client
    ActionCreator
    xml
    Store
    Fragment
    Repository
    suspend call
    DataBinding
    BroadcastChannel
    suspend call suspend call
    suspend call
    LiveData
    Flux
    call
    data
    Repository
    2019
    

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53. View Slide

54. 'MVYʹΑΔ7JFX؅ཧͷ৽͍͠
    Ξϓϩʔν
    ϞδϡʔϧԽʹΑΔ໾ׂɾ
    ґଘؔ܎ͷ໌֬Խ
    

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55. View Slide

56. 2020
    TUBUT 044 ਓ
    ,PUMJOɾ4XJGU"OESPJEɾJ04
    ΞʔΩςΫνϟ .77.3FQPTJUPSZ.VMUJ.PEVMF
    ࣌୅എܠ
    +FUQBDL$PNQPTFBMQIBͰ੝Γ্͕Δɻ
    "OESPJEY Yܥͷ࣌୅
    δΣενϟφϏήʔγϣϯͷରԠ
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    %BHHFS
    ,PUMJO$PSPVUJOFT'MPXT
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    (SPVQJF
    %BUB#JOEJOH
    $PJM
    

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57. 2020
    Model
    Coroutines Flow
    Activity
    Fragment
    xml
    DataBinding
    Database
    Room
    API
    Ktor-Client
    Repository
    ViewModel
    call
    Suspend call
    Suspend call
    LiveData
    

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58. 2020
    Model
    Coroutines Flow
    Activity
    Fragment
    xml
    DataBinding
    Database
    Room
    API
    Ktor-Client
    Repository
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    call
    Suspend call
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    data
    View
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    Repository
    

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59. View Slide

60. "OESPJE%FWFMPQFSTʹهࡌ͞ΕΔ
    ਪ঑ΞʔΩςΫνϟ΁ͷ௥ै
    6J.PEFMΛ༻͍ͨ7JFX΁ͷ
    ঢ়ଶߋ৽ͷ໌֬Խ
    

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61. എܠͱൃදͰ
    ໨ࢦ͢ΰʔϧ
    ֤೥ͷ
    ηογϣϯ
    ৘ใऔಘը໘
    ࣮૷
    ೥ͷ
    %,BJHJΞϓϦ
    ͔Βඥղ͘
    ະདྷͷ
    σϑΝΫτ
    Section 1 Section 2 Section 3
    Agenda
    

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62. എܠͱൃදͰ
    ໨ࢦ͢ΰʔϧ
    ֤೥ͷ
    ηογϣϯ
    ৘ใऔಘը໘
    ࣮૷
    ೥ͷ
    %,BJHJΞϓϦ
    ͔Βඥղ͘
    ະདྷͷ
    σϑΝΫτ
    Section 1 Section 2 Section 3
    Agenda
    

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63. (Section3) Learn future
    de facto for Android
    app development from
    conference app 2021.
    ͜ͷηΫγϣϯͷ໨త
    ະདྷͷΞʔΩςΫνϟσϑΝΫτΛ
    DPOGFSFODFBQQ͔Βײ͡Δ
    +FUQBDL$PNQPTFͱͷ޲͖߹͍ํɾ
    ϚϧνϓϥοτϑΥʔϜͰͷ
    ڞ௨Խʹ͍ͭͯߟ͑Δ
    

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64. View Slide

65. 2021
    TUBUT 044 ਓ
    ,PUMJOɾ4XJGU"OESPJEɾJ04
    ΞʔΩςΫνϟ .77..7*.VMUJNPEVMF
    ࣌୅എܠ
    ,..ʹΑΔϚϧνϓϥοτϑΥʔϜ
    "OESPJEͷ࣌୅
    .BUFSJBM:PV
    ओͳϥΠϒϥϦ
    )JMU
    ,PUMJO$PSPVUJOFT'MPXT
    ,UPS
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    +FUQBDL$PNQPTF
    

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66. 2021
    $PNQPTFͷར༻ʹΑΔ
    6*هड़ෳࡶԽ΁ͷ௅ઓ
    ,..ʹΑΔ"OESPJEɾJ04
    ϩδοΫڞ௨Խ
    

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67. 2021
    Model
    Coroutines Flow
    Activity
    Fragment
    Jetpack Compose
    Database
    DataStore
    API
    Ktor-Client
    Repository
    ViewModel
    call
    Suspend call
    Suspend call
    flow
    

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68. 2021
    Model
    Coroutines Flow
    Activity
    Fragment
    Jetpack Compose
    Database API
    Ktor-Client
    Repository
    ViewModel
    call
    Suspend call
    Suspend call
    flow
    View
    DataStore
    

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69. 2021
    ViewModel Screen(Statefull)
    Screen(Steteless)
    Screen
    Data
    Data
    Event
    Event
    Event
    State
    Effect
    

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70. 2021
    Model
    Coroutines Flow
    Activity
    Fragment
    Jetpack Compose
    Database
    DataStore
    API
    Ktor-Client
    Repository
    ViewModel
    call
    Suspend call
    Suspend call
    flow
    

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71. 2021
    Model
    Coroutines Flow
    Activity
    Fragment
    Jetpack Compose
    Database API
    Ktor-Client
    Repository
    ViewModel
    call
    Suspend call
    Suspend call
    flow
    Data (Android/iOS)
    DataStore
    

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72. 2021
    Data
    Compose
    Android iOS
    ViewModel
    Wrapper
    SwiftUI
    call
    flow
    call
    flow
    ͲͪΒͷϓϥοτϑΥʔϜͰ΋ಈ͘Α͏ͳٕज़બఆ
    

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73. Conclusion
    

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74. Conclusion
    2021
    2015
    Dagger2 Hilt
    xml Compose
    rxjava1 rxjava2 coroutines
    orma room DataStore
    Picasso Glide Coil
    

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75. ΧϯϑΝϨϯεΞϓϦͷྺ࢙Λඥղ͍ͯ೔ʑͷ։ൃͷώϯτʹ͠Α͏
    7JFXͷෳࡶੑʹཱͪ޲͔͏ͨΊʹ༷ʑͳΞϓϩʔν͕औΒΕ͖ͯͨ
    ϨΠϠؒΛͭͳ͙ TUSFBNͷϥΠϒϥϦ͸සൟʹมԽ͖ͯͨ͠
    Conclusion
    Կ͕Կʹஔ͖׵Θͬͨͷ͔Λ৻ॏʹோΊΔ͜ͱ͕େ੾
    

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76. ΧϯϑΝϨϯεΞϓϦͷྺ࢙Λඥղ͍ͯ೔ʑͷ։ൃͷώϯτʹ͠Α͏
    ະདྷͷ"OESPJEΞϓϦ։ൃͷσϑΝΫτΛײ͡Α͏
    7JFXͷෳࡶੑʹཱͪ޲͔͏ͨΊʹ༷ʑͳΞϓϩʔν͕औΒΕ͖ͯͨ
    ϨΠϠؒΛͭͳ͙ TUSFBNͷϥΠϒϥϦ͸සൟʹมԽ͖ͯͨ͠
    $PNQPTFʹΑΔ 6*࡞੒
    ,..ʹΑΔϩδοΫڞ௨Խ
    Conclusion
    Կ͕Կʹஔ͖׵Θͬͨͷ͔Λ৻ॏʹோΊΔ͜ͱ͕େ੾
    ՝୊΋·ͩ͋Δ
    

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77. Thank you
    ࣭໰͸ΦϑΟεΞϫʔʹ͓ͯئ͍͠·͢ʂ
    

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78. Bibliography
    

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79. [1] DroidKaigi, “DroidKaigi公式フィードアプリ” https://play.google.com/store/apps/details?id=io.github.droidkaigi.feeder
    [2] konifar, “DroidKaigi2016 Repository” https://github.com/konifar/droidkaigi2016
    [3] DroidKaigi, “DroidKaigi2017 Repository” https://github.com/DroidKaigi/conference-app-2017
    [4] DroidKaigi, “DroidKaigi2018 Repository” https://github.com/DroidKaigi/conference-app-2018
    [5] DroidKaigi, “DroidKaigi2019 Repository” https://github.com/DroidKaigi/conference-app-2019
    [6] DroidKaigi, “DroidKaigi2020 Repository” https://github.com/DroidKaigi/conference-app-2020
    [7] DroidKaigi, “DroidKaigi2021 Repository” https://github.com/DroidKaigi/conference-app-2021
    [8] ⽇⾼正博,⼩⻄裕介,藤原聖,吉岡毅,今井智章, “Androidアプリ設計パターン⼊⾨” https://peaks.cc/books/architecture_patterns
    [9] Johannes, “The good and bad of modern app architecture” https://droidkaigi.jp/2019/timetable/70668
    [10] mhidaka, “mhidakaさんのtweets” https://twitter.com/mhidaka/status/1441264050332061699
    [11] konifar, “DroidKaigi2018-flutter Repository” https://github.com/konifar/droidkaigi2018-flutter
    [12] chigichan24, “DroidKaigi2019のコードを読み解く” https://speakerdeck.com/chigichan24/read-droidkaigi2019-app-source-code
    [13] Aakira, “flux with kotlin” https://speakerdeck.com/aakira/flux-with-kotlin-abema-dev-con-2016
    [14] 釘宮慎之介,横幕圭真, “チームで育てるAndroidアプリ設計” https://peaks.cc/books/architecture_with_team
    [15] KenzoNirasawa, “iOSエンジニアがKMPで⼤規模アプリのロジック共通化をしてうまくできている話”
    https://speakerdeck.com/nirazo/iosdc2021
    [16] Wikipedia, “Android version history” https://en.wikipedia.org/wiki/Android_version_history
    [17] chigichan24, “継続的に機能開発を進めながら⾏うマルチモジュール化”
    https://speakerdeck.com/chigichan24/ji-sok-de-niji-neng-kai-fa-wojin-menagaraxing-umarutimoziyuruhua
    [18] Google Developers, “アプリアーキテクチャガイド” https://developer.android.com/jetpack/guide
    [19] Google Developers, “開発者基調講演 (Google I/O ’17)” https://www.youtube.com/watch?v=EtQ8Le8-zyo
    

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