Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Speaker Deck
PRO
Sign in
Sign up
for free
matching_dev1
Ryo.Nitami
November 14, 2018
Technology
0
180
matching_dev1
https://matching-dev-group.connpass.com/event/104675/
Ryo.Nitami
November 14, 2018
Tweet
Share
More Decks by Ryo.Nitami
See All by Ryo.Nitami
bird_tummy
1
550
bird_tummy
0
2.4k
bird_tummy
2
2.6k
bird_tummy
0
2.7k
bird_tummy
0
200
bird_tummy
1
2.2k
bird_tummy
0
210
bird_tummy
2
84
bird_tummy
0
1.9k
Other Decks in Technology
See All in Technology
clustervr
0
170
fujiihda
8
1.2k
opdavies
0
1.6k
yamasaki696
0
390
fu3ak1
0
1.1k
ocise
0
210
sylk
0
360
kekeke_47
0
460
i35_267
0
280
recruitengineers
0
140
torisoup
0
310
ganariya
0
320
Featured
See All Featured
jmmastey
9
550
ufuk
56
5.4k
robhawkes
52
2.8k
skipperchong
7
670
jlugia
216
16k
shpigford
368
42k
mthomps
39
2.3k
jacobian
255
20k
malarkey
393
60k
jonrohan
1021
380k
mza
80
4.1k
kneath
294
39k
Transcript
Paging Library ʹ͓͚ΔΞΫγϣϯΛ ϑοΫʹͨ͠Ϧετߋ৽ 2018/11/14 Matching Dev Meetup: iOS /
Android Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 1
Who? — Ryo Nitami — Android Application Engineer @ playmotion,
Inc. — Twitter: bird_tummy — GitHub: rnitame Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 2
Ϋϩεϛʔ — "͢Εҧ͍Λ࿀ͷ͖͔͚ͬʹ" — ҐஔใΛͬͨϚονϯάαʔϏε — 10/30 ʹ Android ΞϓϦΛϑϧϦχϡʔΞϧ͠·ͨ͠ʂ
— Architecture Components ΓΓ + Kotlin 100% — ͜Ε͔ΒΞοϓσʔτ͕ΜΓ·͢ Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 3
Paging Library — 2017 ͷ I/O Ͱൃද͞ΕͨɺϖʔδϯάʹಛԽͨ͠ϥΠϒ ϥϦ — "The
Paging Library makes it easier for you to load data gradually and gracefully within your app's RecyclerView." — 2018/11/14 ݱࡏɺ2.1.0-beta01 Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 4
Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 5
ΫϩεϛʔͰͷར༻ྫ — Ϧετʹͳ͍ͬͯΔͱ͜Ζ͢ ͯ Paging Library Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 6
ΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ ৽ — ඇදࣔϢʔβʔϦετͳͲ — ʮϘλϯΛԡ͢ → API Λୟ͘ →
View Λߋ৽͢Δʯͱ͍͏ྲྀΕ͕ ༷ʑͳ໘Ͱൃੜ Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 7
·ͬͨͱ͜Ζ — PagedList ཁૉͷՃߋ৽ɺআ͕Ͱ͖ͳ͍ Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 8
PagedList ཁૉͷՃߋ৽ɺআ͕Ͱ͖ͳ͍ — issue tracker Ͱʮόά͡Όͳͯ͘ػೳ͕Γ͍ͯͳ͍ͩ ͚ͩʂʯͱ͍͏͕ٞ1 1 https://issuetracker.google.com/issues/74916992 Paging
Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 9
PagedList MutableList Ͱͳ͍ʂ — googlesamples ͷ issue Ͱ Room
͓ͬͯίϝϯτ͕ ͋Δ2 — ΫϩεϛʔͰ͜ͷํ๏ͰରԠ 2 https://github.com/googlesamples/android-architecture-components/issues/281 Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 10
Room ܦ༝ͰϦετදࣔ Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 11
class UserBoundaryCallback( private val helper: UserPagingRequestHelper ) : PagedList.BoundaryCallback<User>() {
@MainThread override fun onZeroItemsLoaded() { } @MainThread override fun onItemAtFrontLoaded(itemAtFront: User) { } @MainThread override fun onItemAtEndLoaded(itemAtEnd: User) { super.onItemAtEndLoaded(itemAtEnd) // API Λୟ͍ͯ get data helper.loadAfterIfNotRunning(before = itemAtEnd.time) } } Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 12
@Dao interface UserDao { @Query("SELECT * FROM users") fun allUsers():
DataSource.Factory<Int, User> @Insert(onConflict = OnConflictStrategy.REPLACE) fun save(users: List<User>): List<Long> } Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 13
private val config = PagedList.Config.Builder() .setEnablePlaceholders(false) .setInitialLoadSizeHint(LOAD_COUNT) .setPageSize(LOAD_COUNT) .build() private
val helper = UserPagingRequestHelper().start() // ͜ͷ LiveData Λ Activity / Fragment Ͱ observe ͯ͠ submitList val users = LivePagedListBuilder(userDatabase.dao().allUsers(), config) .setBoundaryCallback(UserBoundaryCallback(helper)) .setFetchExecutor(executor) .build() fun updateUsers() { // DB ʹอଘ } fun deleteUser(userId: Long) { // DB ͷϢʔβʔΛߋ৽ͭͭ͠ɺ֘ API ୟ͘ } Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 14
·ͱΊ — Paging Library ͱ Room ΛͬͯɺΞΫγϣϯΛϑοΫʹ ͨ͠Ϧετߋ৽ͷ࣮Λͨ͠ — PagedList
Λ͍͡ΕΕ͍͍ͳͱࢥ͏͕ɺPaging Library ࣗମͷׂΛߟ͑Δͱ͜͏͢Δͷ͕ࣗવʁ — ࠓޙͷΞοϓσʔτʹظ Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 15
͋Γ͕ͱ͏͍͟͝·ͨ͠ Paging Library ʹ͓͚ΔΞΫγϣϯΛϑοΫʹͨ͠Ϧετߋ৽ 16