Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
AndroidXとKotlin Coroutines
Search
Takuji Nishibayashi
May 15, 2019
Technology
0
350
AndroidXとKotlin Coroutines
Takuji Nishibayashi
May 15, 2019
Tweet
Share
More Decks by Takuji Nishibayashi
See All by Takuji Nishibayashi
CameraX使ってみた
takuji31
0
120
kotlinx.datetime 使ってみた
takuji31
0
440
HiltのCustom Componentについて
takuji31
0
210
java.timeをAndroidで使う
takuji31
0
85
KSPを使ってコード生成
takuji31
0
340
Kotlin Symbol Processing API (KSP) を使って Kotlin ア プリケーションの開発を効率化する
takuji31
1
1.1k
kotlinx.serialization
takuji31
0
570
kanmoba-returns-02.pdf
takuji31
0
200
AndroidXに潜む便利なヤツら
takuji31
0
160
Other Decks in Technology
See All in Technology
Oracle Cloud Infrastructure:2025年1月度サービス・アップデート
oracle4engineer
PRO
1
460
プロセス改善による品質向上事例
tomasagi
0
170
AIをプロダクトに実装するならAPIで分離しよう 〜タクシーアプリ『GO』のアーキテクチャ実例紹介〜
74th
2
140
家電アプリ共通PF "Linova" のAPI利用とPostman活用事例ご紹介
yukiogawa
0
110
君はPostScriptなウィンドウシステム 「NeWS」をご存知か?/sunnews
koyhoge
0
680
BLEAでAWSアカウントのセキュリティレベルを向上させよう
koheiyoshikawa
0
180
Ask! NIKKEIの運用基盤と改善に向けた取り組み / NIKKEI TECH TALK #30
kaitomajima
1
400
5分で紹介する生成AIエージェントとAmazon Bedrock Agents / 5-minutes introduction to generative AI agents and Amazon Bedrock Agents
hideakiaoyagi
0
170
AIプロダクト開発から得られた知見 - 2025年1月版
takaakikakei
0
180
日経電子版 x AIエージェントの可能性とAgentic RAGによって提案書生成を行う技術
masahiro_nishimi
1
230
Postman Vaultを使った秘密情報の安全な管理
nagix
3
230
Amazon Aurora バージョンアップについて、改めて理解する ~バージョンアップ手法と文字コードへの影響~
smt7174
1
460
Featured
See All Featured
Java REST API Framework Comparison - PWX 2021
mraible
28
8.4k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
11
930
For a Future-Friendly Web
brad_frost
176
9.5k
Typedesign – Prime Four
hannesfritz
40
2.5k
Scaling GitHub
holman
459
140k
Speed Design
sergeychernyshev
25
770
Music & Morning Musume
bryan
46
6.3k
Done Done
chrislema
182
16k
The Cost Of JavaScript in 2023
addyosmani
47
7.3k
Building a Modern Day E-commerce SEO Strategy
aleyda
38
7.1k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
How to train your dragon (web standard)
notwaldorf
90
5.8k
Transcript
AndroidXͱKotlin Corou.nes @takuji31 ؼ͖ͬͯͨؔϞόΠϧΞϓϦݚڀձ
ࣗݾհ
ࣗݾհ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co.,
Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ
ࣗݾհ • Android • Kotlin • Flu-er • ! h-ps:/
/blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp
AndroidX
LiveData? ViewModel? AppCompat? Naviga5on
ͬͯ·͢ΑͶ
Kotlin Corou+nes
ͬͯ·͔͢ʁ
Google I/O 2019
Android development will become increasingly Kotlin-first — h$ps://android-developers.googleblog.com/2019/05/google- io-2019-empowering-developers-to-build-experiences-on-Android- Play.html
AndroidXʹKotlinαϙʔτ͕ଓʑ
Ұ෦ → h$ps:/ /speakerdeck.com/ takuji31/androidxniqian-mubian-li- nayatura
ࠓCorou%neαϙʔτͷΛ͠ ·͢
α൛ͷͷؚ·ΕΔͷͰ ͝ར༻ܭըతʹ
ViewModel.viewModelScope
ViewModelͷonClearedͰΩϟϯ ηϧ͞ΕΔCoroutineScope
ViewModelͰCorou,neΛ͍ ͘͢ͳΔ
Dispatcher Dispatchers.Main͕ઃఆ͞ΕΔ
໌ࣔతʹࢦఆ͠ͳ͍ݶΓશͯͷॲཧ ͕ϝΠϯεϨουͰ࣮ߦ
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
class UserViewModel : ViewModel() { val name: MutableLiveData<String> = MutableLiveData()
init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }
※DispatcherΛઃఆ͠ͳ͍··ॏ͍ ॲཧΛ͠ͳ͍
LifecycleOwner .lifecycleScope
Lifecycleͱ࿈ಈͨ͠ CoroutineScope
Lifecycle.State.DESTROYED ʹͳͬͨ࣌ʹΩϟϯηϧ͞ΕΔ CoroutineScope
whenCreated / whenStarted / whenResumed
fun onCreate(savedInstanceState: Bundle?) { lifecycleScope.launch { whenResumed { val user
= withContext(Dispatchers.Default) { try { userRepository.fetchMyUser() } catch (e: IOException) { null } } if (user == null) { showErrorAndFinish() } viewModel.setup(user) } } }
fun onCreate(savedInstanceState: Bundle?) { lifecycleScope.launch { whenResumed { val user
= withContext(Dispatchers.Default) { try { userRepository.fetchMyUser() } catch (e: IOException) { null } } if (user == null) { showErrorAndFinish() } viewModel.setup(user) } } }
fun onCreate(savedInstanceState: Bundle?) { lifecycleScope.launch { whenResumed { val user
= withContext(Dispatchers.Default) { try { userRepository.fetchMyUser() } catch (e: IOException) { null } } if (user == null) { showErrorAndFinish() } viewModel.setup(user) } } }
fun onCreate(savedInstanceState: Bundle?) { lifecycleScope.launch { whenResumed { val user
= withContext(Dispatchers.Default) { try { userRepository.fetchMyUser() } catch (e: IOException) { null } } if (user == null) { showErrorAndFinish() } viewModel.setup(user) } } }
fun onCreate(savedInstanceState: Bundle?) { lifecycleScope.launch { whenResumed { val user
= withContext(Dispatchers.Default) { try { userRepository.fetchMyUser() } catch (e: IOException) { null } } if (user == null) { showErrorAndFinish() } viewModel.setup(user) } } }
liveData()
Corou%neΛLiveDataʹม
class UserViewModel : ViewModel() { val userName: LiveData<String> = liveData
{ val user = userRepository.fetchMyUser() emit(user.name) } }
class UserViewModel : ViewModel() { val userName: LiveData<String> = liveData
{ val user = userRepository.fetchMyUser() emit(user.name) } }
class UserViewModel : ViewModel() { val userName: LiveData<String> = liveData
{ val user = userRepository.fetchMyUser() emit(user.name) } }
class UserViewModel : ViewModel() { val userName: LiveData<String> = liveData
{ val user = userRepository.fetchMyUser() emit(user.name) } }
class UserViewModel : ViewModel() { val userName: LiveData<String> = liveData
{ val user = userRepository.fetchMyUser() emit(user.name) } }
Ҿͷblock͕suspended func.on
LiveData͕Ac*veʹͳͬͨ࣌ʹblock ͷॲཧ͕࣮ߦ͞ΕΔ
ྫ֎͕ൃੜͨ͠ΒͦΕҎ͕߱ྲྀ Εͳ͍
ͦͷଞ
ͦͷଞ • CoroutineWorker • Work ManagerͷWorkerͷdoWork͕suspended func2onͳόʔδϣϯ • όοΫάϥϯυͰඇಉظॲཧΛ͍ͨ࣌͠ʹ͑ͦ͏ •
room-ktx • RoomͷDAOͷϝιουʹsuspended func2on͕͑Δ • @Transac2onͱऍͨ͠ϝιουΛݺͿͱੜ͞ΕΔDAOͷϝιου ͕τϥϯβΫγϣϯͰ·ͱΊΒΕΔ
h"ps:/ /developer.android.com/ topic/libraries/architecture/ corou6nes
Enjoy Kotlin Corou.nes life!