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Paging Library は便利だぞ!
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Hunachi
June 08, 2018
Programming
1
470
Paging Library は便利だぞ!
#hakata_apk で発表した際のスライドです.
# Android
Hunachi
June 08, 2018
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Transcript
Paging Libraryศརͩͧʂ # # #
ࣗݾհ ▪ ;ͳͪʢHana Kondoʣ ▪ ٱཹถߴઐ ੍ޚใֶՊ 4ʢΪϦΪϦ18ࡀʣ ▪ AndroidΛ৮ΓॳΊͯ1.5͘Β͍ʁͷ·ͩ·ͩະख़ऀɽ
▪ Kotlin͕͖ɽ ▪ ॳΊͯͷ෦֎LTͰ͢ɽ ▪ ·͔͞Γͬͯ·͢ʂ @Hunachi @_hunachi
Paging Library ͱ? ▪ RecyclerViewඞཁͳ͚ͩঃʑʹऔಘͯ͘͠ΕΔɽ Ø εΫϩʔϧ͍ͯͬͯ͠ऴʹۙͣ͘ͱଓ͖ͷItemΛऔಘͯ͘͠ΕΔɽ ▪ ॳΊͯදʹݱΕͨͷڈͷ9݄ɽ ▪
Android JetPackͷҰһʂ ▪ ࠓͷ Google I/O Ͱ҆ఆ൛͕ϦϦʔε͞Εͨʂʢ͔ͩΒnew!ʣ
None
▪ ແݶʹ͍ListΛऔಘ͍ͨ࣌͠ɼද͍͚ࣔͤͨͩ͞ใΛऔಘɽ Ø ແବͳ௨৴ϝϞϦΛΘͳ͍ɽ Ø εϜʔζʹߋ৽͞ΕΔͷͰɼUX্͕ɽ ▪ PagingΛࣗͰ࣮͠ͳ͍͍͔ͯ͘Βָʂ ▪ Roomͱͷ૬ੑൈ܈ʂҰॹʹ͏ͱΊͬͪΌָͰ͖Δʂ
▪ Data OK Ø NetɼDataBaseɼFileɽɽɽ ͏ར
͍ํ ᶃ ListAdapter Λͬͨ RecyclerView Λ࡞Δɽ ᶄ ListAdapter -> PagedListAdapterʹ͢Δɽ
ᶅ DataSource ͱ DataSource.Factory Λ࡞Δɽ ᶆ BuilderΛ࡞Δɽ ᶇ ViewModelʹLiveData<PagedList>Λ࡞Δɽ ᶈ submitListΛͯ͠ʂ Ͳ͏͍͏αΠΫϧͰಈ͔͘ɼCodelabͷWrap upʹॻ͍ͯ͋Δ ͷͰࠓճ࣮ํ๏ͷΈհ͠·͢ɽ
https://www.youtube.com/watch?v=QVMqCRs0BNA
ListAdapter -> PagedListAdapterʹ͢Δɽ
DataSourceͱDataSource.FactoryΛ࡞Δɽ σʔλݩ͕େ͖͚͘Δͱɼ3έʔε͋Δɽ 1. DataBaseʢRoomͱซ༻ʣ 2. DataBase + OtherSourceʢ ྫ: NetWork
ʣ 3. OtherSourceʢྫ: NetWork ʣ
DataBaseRoom ▪ List<Memo> -> DataSource.Factory<Int, Memo> ʹ͢Δ͚ͩɽ
DataBase + OtherSourceʢྫ: NetWork ʣ ▪ DB͔ΒσʔλΛऔಘ͠ɼσʔλ͕Γͳ͘ͳͬͨΒBoundaryCallbackʹ௨ɽ ▪ σʔλΛAPI͔Βऔ͖ͬͯͯɼDBΛߋ৽͢Δɽ ▪
PagingͷCodeLab͕͜ͷܗɽ https://codelabs.developers.google.com/codelabs/android-paging/.
ଓ͖ ▪ BoundaryCallback͜Μͳײ͡ɽ
OtherSourceʢྫ: NetWork ʣ ▪ DataSourceΛ͜Μͳײ͡Ͱ࡞Δɽʢσʔλݩ͕ϖʔδϯάʹରԠ͍ͯ͠Δʣ
ଓ͖ ▪ DataͷऴΘΓnullͰڭ͑ͯ͋͛Δɽ ▪ ΤϥʔϋϯυϦϯάɼϦτϥΠॲཧɼ Executorͱ͔LiveDataΛͬͯؤு ΔʂʢެࣜͷαϯϓϧΛΈΔͱ͍͍ͱࢥ͍·͢ʂʣ ▪ σʔλݩ͕ϖʔδϯάʹରԠ͍ͯ͠Δ߹ Ø
PageKeyedDataSource Λ͏ɽ Ø callbackͷҾ͕ ListͱݱࡏͷPageɽ ▪ σʔλݩ͕ϖʔδϯάʹରԠ͍ͯ͠ͳ͍߹ Ø ItemKeyedDataSource Λ͏ɽ Ø callbackͷҾ͕ Item ͷΈɽ
BuilderΛ࡞Δɽ
࠷ޙʹsubmitList͢Δɽ
▪ )* Demo,/0 ▪ 5 1 #&-4
6 ! ▪ "$ ▪ https://github.com/Hunachi/wantedly-coding-challenge-publicNetWork ▪ https://github.com/Hunachi/HunaSchedule2 DataBase!%'(+2 3-.
͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɽ