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Takuji Nishibayashi
May 15, 2019
Technology
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AndroidXとKotlin Coroutines
Takuji Nishibayashi
May 15, 2019
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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!