Paging Library は便利だぞ！

#hakata_apk で発表した際のスライドです．
# Android

Transcript

1. Paging Library͸ศརͩͧʂ
   # #
   #
   

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2. ࣗݾ঺հ
   ■ ;ͳͪʢHana Kondoʣ
   ■ ٱཹถߴઐ ੍ޚ৘ใ޻ֶՊ 4೥ʢΪϦΪϦ18ࡀʣ
   ■ AndroidΛ৮ΓॳΊͯ໿1.5೥͘Β͍ʁͷ·ͩ·ͩະख़ऀɽ
   ■ Kotlin͕޷͖ɽ
   ■ ॳΊͯͷ෦֎LTͰ͢ɽ
   ■ ·͔͞Γ଴ͬͯ·͢ʂ
   @Hunachi
   @_hunachi
   

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3. Paging Library ͱ͸?
   ■ RecyclerViewඞཁͳ෼͚ͩঃʑʹऔಘͯ͘͠ΕΔɽ
   Ø εΫϩʔϧ͍ͯͬͯ͠ऴ୺ʹۙͣ͘ͱଓ͖ͷItemΛऔಘͯ͘͠ΕΔɽ
   ■ ॳΊͯදʹݱΕͨͷ͸ڈ೥ͷ9݄ɽ
   ■ Android JetPackͷҰһʂ
   ■ ࠓ೥ͷ Google I/O Ͱ҆ఆ൛͕ϦϦʔε͞Εͨʂʢ͔ͩΒnew!ʣ
   

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5. ■ ແݶʹ௕͍ListΛऔಘ͍ͨ࣌͠΋ɼද͍ࣔͤͨ͞෼͚ͩ৘ใΛऔಘɽ
   Ø ແବͳ௨৴΍ϝϞϦΛ࢖Θͳ͍ɽ
   Ø εϜʔζʹߋ৽͞ΕΔͷͰɼUX͕޲্ɽ
   ■ PagingΛࣗ෼Ͱ࣮૷͠ͳ͍͍͔ͯ͘Βָʂ
   ■ Roomͱͷ૬ੑൈ܈ʂҰॹʹ࢖͏ͱΊͬͪΌָͰ͖Δʂ
   ■ Data
   OK
   Ø NetɼDataBaseɼFileɽɽɽ
   ࢖͏ར఺
   

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6. ࢖͍ํ
   ᶃ ListAdapter Λ࢖ͬͨ RecyclerView Λ࡞Δɽ
   ᶄ ListAdapter -> PagedListAdapterʹ͢Δɽ
   ᶅ DataSource ͱ DataSource.Factory Λ࡞Δɽ
   ᶆ BuilderΛ࡞Δɽ
   ᶇ ViewModelʹLiveDataΛ࡞Δɽ
   ᶈ submitListΛͯ͠׬੒ʂ
   Ͳ͏͍͏αΠΫϧͰಈ͔͘͸ɼCodelabͷWrap upʹॻ͍ͯ͋Δ
   ͷͰࠓճ͸࣮૷ํ๏ͷΈ঺հ͠·͢ɽ
   

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7. https://www.youtube.com/watch?v=QVMqCRs0BNA
   

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8. ListAdapter -> PagedListAdapterʹ͢Δɽ
   

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9. DataSourceͱDataSource.FactoryΛ࡞Δɽ
   σʔλݩ͕େ͖͘෼͚Δͱɼ3έʔε͋Δɽ
   1. DataBaseʢRoomͱซ༻ʣ
   2. DataBase + OtherSourceʢ ྫ: NetWork ʣ
   3. OtherSourceʢྫ: NetWork ʣ
   

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10. DataBaseRoom
    ■ List -> DataSource.Factory ʹ͢Δ͚ͩɽ
    

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11. DataBase + OtherSourceʢྫ: NetWork ʣ
    ■ DB͔ΒσʔλΛऔಘ͠ɼσʔλ͕଍Γͳ͘ͳͬͨΒBoundaryCallbackʹ௨஌ɽ
    ■ σʔλΛAPI౳͔Βऔ͖ͬͯͯɼDBΛߋ৽͢Δɽ
    ■ PagingͷCodeLab͕͜ͷܗɽ
    https://codelabs.developers.google.com/codelabs/android-paging/.
    

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12. ଓ͖
    ■ BoundaryCallback͸͜Μͳײ͡ɽ
    

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13. OtherSourceʢྫ: NetWork ʣ
    ■ DataSourceΛ͜Μͳײ͡Ͱ࡞Δɽʢσʔλݩ͕ϖʔδϯάʹରԠ͍ͯ͠Δʣ
    

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14. ଓ͖
    ■ DataͷऴΘΓ͸nullͰڭ͑ͯ͋͛Δɽ
    ■ ΤϥʔϋϯυϦϯάɼϦτϥΠॲཧ౳͸ɼ Executorͱ͔LiveDataΛ࢖ͬͯؤு
    ΔʂʢެࣜͷαϯϓϧΛΈΔͱ͍͍ͱࢥ͍·͢ʂʣ
    ■ σʔλݩ͕ϖʔδϯάʹରԠ͍ͯ͠Δ৔߹
    Ø PageKeyedDataSource Λ࢖͏ɽ
    Ø callbackͷҾ਺͕ ListͱݱࡏͷPageɽ
    ■ σʔλݩ͕ϖʔδϯάʹରԠ͍ͯ͠ͳ͍৔߹
    Ø ItemKeyedDataSource Λ࢖͏ɽ
    Ø callbackͷҾ਺͕ Item ͷΈɽ
    

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15. BuilderΛ࡞Δɽ
    

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16. ࠷ޙʹsubmitList͢Δɽ
    
    

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17. ■ )*Demo,/0
    ■ 5 1 #&-46
    !
    ■ "$
    ■ https://github.com/Hunachi/wantedly-coding-challenge-publicNetWork
    ■ https://github.com/Hunachi/HunaSchedule2 DataBase!%'(+2
    3-.
    

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18. ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɽ
    

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