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AndroidXͱKotlin Corou.nes @takuji31 ؼ͖ͬͯͨؔ੢ϞόΠϧΞϓϦݚڀձ

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ࣗݾ঺հ

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ࣗݾ঺հ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co., Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ

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ࣗݾ঺հ • Android • Kotlin • Flu-er • ! h-ps:/ /blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp

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AndroidX

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LiveData? ViewModel? AppCompat? Naviga5on

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࢖ͬͯ·͢ΑͶ

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Kotlin Corou+nes

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࢖ͬͯ·͔͢ʁ

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Google I/O 2019

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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

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AndroidXʹ΋Kotlinαϙʔτ͕ଓʑ

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Ұ෦ → h$ps:/ /speakerdeck.com/ takuji31/androidxniqian-mubian-li- nayatura

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ࠓ೔͸Corou%neαϙʔτͷ࿩Λ͠ ·͢

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α൛ͷ΋ͷ΋ؚ·ΕΔͷͰ ͝ར༻͸ܭըతʹ

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ViewModel.viewModelScope

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ViewModelͷonClearedͰΩϟϯ ηϧ͞ΕΔCoroutineScope

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ViewModel಺ͰCorou,neΛ࢖͍΍ ͘͢ͳΔ

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Dispatcher͸ Dispatchers.Main͕ઃఆ͞ΕΔ

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໌ࣔతʹࢦఆ͠ͳ͍ݶΓશͯͷॲཧ ͕ϝΠϯεϨουͰ࣮ߦ

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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class UserViewModel : ViewModel() { val name: MutableLiveData = MutableLiveData() init { viewModelScope.launch { try { val user = withContext(Dispatchers.Default) { userRepository.fetchMyUser() } name.value = user.name } catch (e: IOException) { // error handling } } } }

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※DispatcherΛઃఆ͠ͳ͍··ॏ͍ ॲཧΛ͠ͳ͍

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LifecycleOwner .lifecycleScope

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Lifecycleͱ࿈ಈͨ͠ CoroutineScope

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Lifecycle.State.DESTROYED ʹͳͬͨ࣌ʹΩϟϯηϧ͞ΕΔ CoroutineScope

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whenCreated / whenStarted / whenResumed

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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) } } }

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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) } } }

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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) } } }

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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) } } }

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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) } } }

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liveData()

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Corou%neΛLiveDataʹม׵

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class UserViewModel : ViewModel() { val userName: LiveData = liveData { val user = userRepository.fetchMyUser() emit(user.name) } }

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class UserViewModel : ViewModel() { val userName: LiveData = liveData { val user = userRepository.fetchMyUser() emit(user.name) } }

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class UserViewModel : ViewModel() { val userName: LiveData = liveData { val user = userRepository.fetchMyUser() emit(user.name) } }

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class UserViewModel : ViewModel() { val userName: LiveData = liveData { val user = userRepository.fetchMyUser() emit(user.name) } }

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class UserViewModel : ViewModel() { val userName: LiveData = liveData { val user = userRepository.fetchMyUser() emit(user.name) } }

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Ҿ਺ͷblock͕suspended func.on

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LiveData͕Ac*veʹͳͬͨ࣌ʹblock ͷॲཧ͕࣮ߦ͞ΕΔ

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ྫ֎͕ൃੜͨ͠ΒͦΕҎ߱͸஋͕ྲྀ Εͳ͍

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ͦͷଞ

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ͦͷଞ • CoroutineWorker • Work ManagerͷWorkerͷdoWork͕suspended func2onͳόʔδϣϯ • όοΫάϥ΢ϯυͰඇಉظॲཧΛ͍ͨ࣌͠ʹ࢖͑ͦ͏ • room-ktx • RoomͷDAOͷϝιουʹsuspended func2on͕࢖͑Δ • @Transac2onͱ஫ऍͨ͠ϝιουΛݺͿͱੜ੒͞ΕΔDAOͷϝιου ͕τϥϯβΫγϣϯͰ·ͱΊΒΕΔ

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h"ps:/ /developer.android.com/ topic/libraries/architecture/ corou6nes

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Enjoy Kotlin Corou.nes life!