potatotips-33

Transcript

1. ϖʔδϯάͷ
   ঢ়ଶ؅ཧ͔Β։์͞Ε͍ͨ
   potatotips #33
   yuyakaido
   

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2. ࣗݾ঺հ
   • ւ౻༏໻ʢ͔͍Ͳ͏Ώ͏΍ʣ
   • גࣜձࣾΤ΢ϨΧ
   • ໿1೥ͷΠϯλʔϯΛܦͯɺ2015೥4݄ʹ৽ଔೖࣾ
   • ςετ͓͡͞Μ
   
   yuyakaido
   yuyakaido
   

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3. ϖʔδϯάͱ͸ʁ
   • ௥ՃಡΈࠐΈ
   • Ϧετͷ࠷Լ෦ʹ౸ୡͨ͠ΒDB΍API͔Β࣍
   ϖʔδͷσʔλΛಡΈࠐΜͰදࣔ͢Δ
   
   

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4. ࠓճͷγφϦΦ
   • RecyclerView
   • ࠷Լ෦·Ͱ౸ୡͨ͠ΒAPI͔ΒσʔλΛऔಘ
   • औಘͨ͠σʔλΛ࠷Լ෦ʹ௥Ճ
   
   

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5. ࣮૷ͯ͠ΈΔ
   • εΫϩʔϧΛίʔϧόοΫͰड͚औΔ
   • RecyclerView#OnScrollListener
   • AbsListView#OnScrollListener
   • ࠷Լ෦·Ͱ౸ୡͨ͠ΒAPIΛୟ͘
   
   

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6. εΫϩʔϧΠϕϯτ
   recyclerView.scrollEvents()
   .filter { RecyclerViewUtil.shouldPaginate(layoutManager) }

   .subscribe({

   // Load next page

   })
   fun shouldPaginate(manager: LinearLayoutManager): Boolean {

   val totalItemCount = manager.itemCount - 1

   val lastVisibleItemPosition = manager.findLastVisibleItemPosition()

   return totalItemCount == lastVisibleItemPosition

   }
   
   εΫϩʔϧͷݕ஌
   ࠷Լ෦ͷ൑ఆ
   

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7. QA͞Μͱͷ΍ΓऔΓ
   ΞΠςϜ͕ॏෳͯ͠දࣔ͞Ε·͢Ͷ
   ͦΜͳΘ͚ͳ͍΍Ζ
   ɾɾɾ
   ΄Μ·΍
   
   

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8. Կނͳͷ͔
   • ίʔϧόοΫ͕Կ౓΋ݺ͹Ε͍ͯΔ
   • Demo
   
   

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9. 
   

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10. ରॲํ๏
    • ಡΈࠐΈதϑϥάΛ࣋ͭ
    • ϑϥάΛͲ͜ʹ͔࣋ͭ
    • Activity/FragmentͷϑΟʔϧυ
    • ؅ཧ͢Δঢ়ଶ͕૿͑Δͷ͸ΠϠ
    • ΫϩʔδϟΛ࢖͏ͱ͍͍ײ͡ʹ؅ཧͰ͖ΔͷͰ͸
    
    

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11. ΫϩʔδϟͰͷঢ়ଶ؅ཧ
    fun getFetcher(category: Category): () -> Observable> {

    var isFetching = false

    var offset = 0

    return fun () = Observable.just(isFetching)

    .filter { !isFetching }

    .doOnNext { isFetching = true }

    .flatMap { repository.getArticles(category, offset) }

    .doOnNext { isFetching = false }

    .doOnNext { offset += it.size }

    }
    • ಡΈࠐΈதϑϥάͱΦϑηοτΛ؅ཧ
    • ಡΈࠐΈதʹୟ͍ͯ΋Կ΋ى͜Βͳ͍
    • Activity/Fragment͔ΒΈΔͱɺԿ΋ߟ͑ͣʹୟ͚͹OK
    
    

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12. ·ͱΊ
    • ϖʔδϯάͰ͸ಡΈࠐΈঢ়ଶΛ؅ཧ͢Δඞཁ͋Γ
    • ঢ়ଶΛΫϥεͷϑΟʔϧυͰ؅ཧͨ͘͠ͳ͍
    • KotlinΛ࢖͍ͬͯΔ৔߹ΫϩʔδϟΛɺJavaͷ৔
    ߹͸ແ໊ΫϥεΛ࢖͏ͱ޾ͤʹͳΕΔ͔΋
    • https://github.com/yuyakaido/Flow-Android
    
    

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13. Thank you :)
    Credit: NASA Earth Observatory/NOAA NGDC
    

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