Androidと非同期処理とCoroutine1.0.0

©2018 Lang-8 Inc. ALL Rights Reserved. wീ໦ढ़޿ w!TZTZBHJ w$50PG w"OESPJE&OHJOFFS
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©2018 Lang-8 Inc. ALL Rights Reserved. w ,PUMJOͱ$PSPVUJOFͱ+FUQBDL w ͳͥ"OESPJEͰίϧʔνϯΛ࢖͍͍͔ͨ
w "OESPJEͰίϧʔνϯΛ࢖͏४උ w ฒߦॲཧΛॻ͘ ௚ྻɺฒྻɺείʔϓͱྫ֎ w ͓·͚3YXJUI$PSPVUJOF w ͓·͚+FUQBDLXJUI$PSPVUJOF ࠓ೔࿩͢͜ͱ

©2018 Lang-8 Inc. ALL Rights Reserved. ,PUMJO w$PSPVUJOF 4UBCMF
w,PUMJO/BUJWF#FUB w,UPS#FUB wΠϯϥΠϯΫϥεɺίϯτϥΫτɺXIFO ࣜͷαϒδΣΫτFUDʜ

©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF w$PSPVUJOF4DPQFΛಋೖ͠طଘͷॻ͖ํ͕ EFQSFDBUFEʹ d
w%JTQBUDIFSTΛಋೖ d wείʔϓͷྫ֎ͷ࢓༷͕มΘͬͨ d wFYQFSJNFOUBMQBDLBHFΛഇࢭ d IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTSFMFBTFT

©2018 Lang-8 Inc. ALL Rights Reserved. +FUQBDLXJUI$PSPVUJOF w8PSL.BOBHFSʹ$PSPVUJOF8PSLFSΛ௥Ճ w3PPNͰTVTQFOEؔ਺Λαϙʔτ w7JFX.PEFMʹWJFX.PEFM4DPQFΛ௥Ճ༧ఆ
"OESPJEͰίϧʔνϯΛศརʹ࢖͏؀ڥ͕ ੔͑ΒΕ͍͍ͯͬͯΔɻ

©2018 Lang-8 Inc. ALL Rights Reserved. w7JFXͷJOqBUF NFBTVSF MBZPVU Ϩϯ
μϦϯάɺλονΠϕϯτͳͲදࣔʹؔΘΔ ॲཧΛ͢Δ w)[ͳΒϑϨʔϜNT͔͠ͳ͍ ϑϨʔ Ϝམͪ͸ମݧΛଛͶΔ w௕࣌ؒͷϒϩοΩϯά͸"/3ʹͳΔ "OESPJEͱ6*εϨου

©2018 Lang-8 Inc. ALL Rights Reserved. w$36% w%BUBCBTFɺ'JMF*0 w4ZOD w/FUXPSL*0
w$PNQVUF wෳࡶͳܭࢉ ΄ͱΜͲͷΞϓϦ͕ߦ͏ॏ͍ͨॲཧ

©2018 Lang-8 Inc. ALL Rights Reserved. w"TZOD5BTL w&YFDVUPST ͔ͳΓ௿ϨΠϠʔ
w-PBEFST ݱࡏ͸ഇࢭ w'VUVSF NJO4EL7FSTJPOҎ্ w-JCSBSJFT 3Y+BWBɺ࣮࣭σϑΝΫτελϯμʔυ "OESPJEͷඇಉظॲཧ

©2018 Lang-8 Inc. ALL Rights Reserved. εϨουͷ࣮ߦΠϝʔδ 5ISFBE1PPM 8PSLFS 8PSLFS
8PSLFS 8PSLFS εϨου .#d.#΄ ͲϝϞϦΛ࢖͏

©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯͷ࣮ߦΠϝʔδ 5ISFBE1PPM 8PSLFS 8PSLFS
8PSLFS 8PSLFS $PSPVUJOF ʜ ʜ εϨου .#d.#΄ ͲϝϞϦΛ࢖͏ ͭͷίϧʔν ϯͰ,#΄Ͳɻ εϨουͰෳ ਺࣮ߦ͢Δɻ

©2018 Lang-8 Inc. ALL Rights Reserved. ͳͥίϧʔνϯΛ࢖͍͍͔ͨ wݶΒΕͨϦιʔεͰεέʔϧͰ͖Δ w εϨουd.#ʹରͯ͠ɺίϧʔνϯ͸,#ఔ౓
w؆୯ʹ࢖͑Δ ಡΈॻ͖ͷ͠΍͢͞

©2018 Lang-8 Inc. ALL Rights Reserved. wҰ࣌ఀࢭՄೳͳܭࢉΠϯελϯε wεϨουͱಉ͡Α͏ʹϥΠϑαΠ ΫϧΛ࣋ͭ wܧଓঢ়گΛ࣋ͭϓϩάϥϜ͕༰қ
ʹهड़Ͱ͖Δ ίϧʔνϯͱ͸

©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜͱ͸ fun getProfile(id: Int,
f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } }

f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } "1*ʹϦΫΤετͯ݁͠ՌΛฦؔ͢਺

f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } ׬ྃ࣌ͷίʔϧόοΫΛҾ਺ʹऔΔ

f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } ίʔϧόοΫʹଓ͖ͷॲཧΛॻ͘

f: (Profile) -> Unit) fun loadProfile(id: Int) { getProfile(token) { profile -> showProfile(profile) } } ίʔϧόοΫʹଓ͖ͷॲཧΛॻ͘ ܧଓঢ়گΛ࣋ͭϓϩάϥϜ

©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜΛ༰қʹهड़͢Δ suspend fun getProfile(id:
Int): Profile suspend fun loadProfile(id: Int) { val profile = getProfile(token) showProfile(profile) }

©2018 Lang-8 Inc. ALL Rights Reserved. ܧଓঢ়گΛ࣋ͭϓϩάϥϜΛ༰қʹهड़͢Δ suspend fun getProfile(id:
Int): Profile suspend fun loadProfile(id: Int) { val profile = getProfile(token) showProfile(profile) } ϫʔΧʔεϨουͰಈ࡞ 6*εϨουͰಈ࡞

w؆୯ʹ࢖͑Δ ಡΈॻ͖ͷ͠΍͢͞ wܰྔͳϥΠϒϥϦ

©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯ͸ϥΠϒϥϦͰఏڙ͞Ε͍ͯΔ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFT dependencies {
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1' implementation ‘org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.0.1' }

©2018 Lang-8 Inc. ALL Rights Reserved. ίϧʔνϯ͸ϥΠϒϥϦͰఏڙ͞Ε͍ͯΔ dependencies { implementation
'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1' implementation ‘org.jetbrains.kotlinx:kotlinx-coroutines-rx2:1.0.1' } wKBS,# wBQL,# wPQUJNJ[F࠷খ,#

w؆୯ʹ࢖͑Δ ಡΈॻ͖ͷ͠΍͢͞ wܰྔͳϥΠϒϥϦ w KBS,# BQL,# PQUJNJ[F࠷খ,#

©2018 Lang-8 Inc. ALL Rights Reserved. w$PSPVUJOF4DPQF͸ίϧʔνϯͷ࣮ߦ؀ڥ wىಈͨ͠ίϧʔνϯ͸$PSPVUJOF4DPQFͷ ࢠʹͳΔ w$PSPVUJOF4DPQF͕ऴྃ͢Δͱࢠίϧʔν
ϯ΋ऴྃ͢Δ $PSPVUJOF4DPQFΛ༻ҙ͢Δ

©2018 Lang-8 Inc. ALL Rights Reserved. w$PSPVUJOF4DPQF͸ίϧʔνϯͷ࣮ߦ؀ڥ wىಈͨ͠ίϧʔνϯ͸$PSPVUJOF4DPQFͷ ࢠʹͳΔ w$PSPVUJOF4DPQF͕ऴྃ͢Δͱࢠίϧʔν
ϯ΋ऴྃ͢Δ wϥΠϑαΠΫϧʹ߹Θͤͯ$PSPVUJOF4DPQF Λ༻ҙ͢Δ $PSPVUJOF4DPQFΛ༻ҙ͢Δ

©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ class MainActivity :
AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job public interface CoroutineScope { public val coroutineContext: CoroutineContext }

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job ࣮ߦ؀ڥΛઃఆ͢Δ

©2018 Lang-8 Inc. ALL Rights Reserved. %JTQBUDIFS͸࣮ߦ؀ڥΛ࢘Δ wίϧʔνϯΛ࣮ߦ͢ΔεϨου΍࣮ߦεέδϡʔ ϧΛ؅ཧ͢Δ w%JTQBUDIFSTΦϒδΣΫτʹ·ͱ·͍ͬͯΔ
w༻్ʹ߹Θͤͯ੾Γସ͑Δ

©2018 Lang-8 Inc. ALL Rights Reserved. %JTQBUDIFST.BJO wϝΠϯεϨουͰ࣮ߦ͢Δ w"OESPJEͷ৔߹͸6*εϨου )BOEMFS
wLPUMJOYDPSPVUJOFTBOESPJE͕ඞཁ

©2018 Lang-8 Inc. ALL Rights Reserved. %JTQBUDIFST*0 w*0ʹ࠷దԽͨ͠εϨουϓʔϧ w࠷௿ฒߦ w%FGBVMUͱεϨουϓʔϧͱڞ༗͍ͯ͠
ΔͷͰߴ଎ Β͍͠ˣ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTCMPCNBTUFSDPSFLPUMJOYDPSPVUJOFTDPSFTSDTDIFEVMJOH$PSPVUJOF4DIFEVMFSLU

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job ࢠίϧʔνϯͷϋϯυϥ

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } }

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } } ίϧʔνϯΛىಈ

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } } NTఀࢭͯ͠࠶։͢Δ

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch { var count = 0 while (true) { delay(1000) println("hi! ${count++}") } } }

©2018 Lang-8 Inc. ALL Rights Reserved. $PSPVUJOF4DPQFΛ࣮૷͢Δ override fun onPause()
{ job.cancelChildren() super.onPause() }

{ job.cancelChildren() super.onPause() } ࢠίϧʔνϯΛ͢΂ͯ Ωϟϯηϧ ऴྃ ͢Δ

{ job.cancelChildren() super.onPause() }

AppCompatActivity(), CoroutineScope { val job = Job() override val coroutineContext: CoroutineContext get() = Dispatchers.Main + job override fun onResume() { super.onResume() launch {/*…*/} } override fun onPause() { job.cancelChildren() super.onPause() } }

©2018 Lang-8 Inc. ALL Rights Reserved. "OESPJEͰίϧʔνϯΛ࢖͏४උ wίϧʔνϯΛ࣮ߦ͢Δʹ͸ $PSPVUJOF4DPQF͕ඞཁ wϥΠϑαΠΫϧΛ࣋ͭίϯϙʔωϯτͰ
$PSPVUJOF4DPQFΛ࣮૷͢Δ w࣮ߦ؀ڥͷઃఆͱΩϟϯηϧॲཧΛ͢Δ

w$PSPVUJOF4DPQFͷ֦ுؔ਺

w$PSPVUJOF4DPQFͷ֦ுؔ਺ w౉ͨ͠ϥϜμࣜΛίϧʔνϯͱ͠ ͯىಈ͢Δ

©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ͸ wεϨουΛϒϩοΩϯά͢Δ͜ͱͳ͘ॲཧΛఀ ࢭͰ͖Δؔ਺ wίʔϧόοΫͷΑ͏ʹ͋ͱͰఀࢭҐஔ͔Β࠶։
Ͱ͖Δ

Ͱ͖Δ wTVTQFOEؔ਺͸ଞͷTVTQFOEؔ਺͔ΒͷΈ ݺͼग़͕͠Ͱ͖Δ

Ͱ͖Δ wTVTQFOEؔ਺͸ଞͷTVTQFOEؔ਺͔ΒͷΈ ݺͼग़͕͠Ͱ͖Δ wίϧʔνϯϏϧμʔʹΘͨ͢ϥϜμࣜ͸ TVTQFOEϥϜμʹͳ͍ͬͯΔɻ

©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ suspend fun getProfile(id:
Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } }

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ͜͜ͰॲཧΛதஅ͠ɺ࠶։࣌ʹ1SPpMFΛฦؔ͢਺

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ίϧʔνϯͷ࣮ߦ؀ڥΛ੾Γସ͑ΔTVTVQFOEؔ਺

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ίϧʔνϯͷ࣮ߦ؀ڥΛ੾Γସ͑ΔTVTVQFOEؔ਺ ͜͜Ͱ͸ϫʔΧʔεϨουͰಈ͘ઃఆΛ͍ͯ͠Δ

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } "1*ϦΫΤετɻϒϩοΩϯά͢Δॲཧ

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ίϧʔνϯΛىಈ %JTQBUDIFST.BJO KPCͱ͢Δ

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞ ᶅ7JFXʹ൓ө

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞ ᶅ7JFXʹ൓ө ྫ֎࣌͸ͬͪ͜

Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) view.showProfile(profile) } catch(e:CancellationException) { // no op } catch (e: Exception) { view.showError(e) } } } ᶃݺͼग़ͯ͠தஅ͢Δ ϫʔΧʔεϨουͰಈ࡞ ᶄ࠶։ͯ͠୅ೖ 6*εϨουͰಈ࡞ ᶅ7JFXʹ൓ө ྫ֎࣌͸ͬͪ͜ Ωϟϯηϧ είʔϓ͕ऴྃͨ͠ ͸ͬͪ͜

©2018 Lang-8 Inc. ALL Rights Reserved. ௚ྻʹॻ͘ suspend fun getProfile(id:
Int): Profile = withContext(Dispatchers.IO) { requestProfile(id) } suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) { requestTicketCount(id) } fun showProfile(id: Int) { launch { try { val profile = getProfile(id) val ticketCount = getTicketCount(id) view.showProfile(profile, ticketCount) } catch (e: Exception) { view.showError(e) } } }

©2018 Lang-8 Inc. ALL Rights Reserved. ඇಉظॲཧΛॻ͘ wXJUI$POUFYUؔ਺Λ࢖ͬͯίϧʔνϯͷ࣮ߦ ؀ڥΛ੾Γସ͑Δ w௚ྻͰ࣮ߦ͢Δ৔߹͸୯७ʹฒ΂Δ͚ͩͰྑ͍
wΤϥʔͱΩϟϯηϧ͸USZDBUDIͰॲཧ͢Δ wඇಉظॲཧͷ΄ͱΜͲ͸͜ΕͰରԠͰ͖Δ͸ͣ

©2018 Lang-8 Inc. ALL Rights Reserved. ฒྻʹॻ͘ suspend fun getProfile(id:
Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } }

Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } DPSPVUJOF4DPQFؔ਺Λ࢖ͬͯ ࢠείʔϓΛ։࢝͢Δ

Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } BTZODؔ਺ͰίϧʔνϯΛෳ਺ىಈ͢Δ

Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } ଴ͪ߹ΘͤΔ

©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺͕ͳ͔ͬͨΒ suspend fun getProfile(id:
Int): Profile = withContext(Dispatchers.IO) {…} suspend fun getTicketCount(id: Int): Int = withContext(Dispatchers.IO) {…} fun showProfile(id: Int) { launch { try { val profile = async { getProfile(id) } val tickets = async { getTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } catch (e: Exception) { view.showError(e) } } }

©2018 Lang-8 Inc. ALL Rights Reserved. wߏ଄Խϓϩάϥϛϯάͷฒߦੑ൛ wฒߦॲཧʹ͓͚ΔHPUPͷΑ͏ͳ ΋ͷΛͳٞ͘͢࿦ w$PSPVUJOF4DPQF͸͜ͷٞ࿦
Λجʹಋೖ͞Εͨ ฒߦੑͷߏ଄Խͬͯʁ

©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑʹ͓͚ΔHPUP void save(int data,
File file) { try (FileOutputStream out = new FileOutputStream(file);) { new Thread() { @Override public void run() { try { out.write(data); } catch (IOException e) { // error } } }.start(); } catch (IOException e) { // error } }

©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑʹ͓͚ΔHPUP void save(int data,
File file) { try (FileOutputStream out = new FileOutputStream(file);) { new Thread() { @Override public void run() { try { out.write(data); } catch (IOException e) { // error } } }.start(); } catch (IOException e) { // error } } USZXJUISFTPVSDFTͰϑΝΠϧΛ։͘

©2018 Lang-8 Inc. ALL Rights Reserved. void save(int data, File
file) { try (FileOutputStream out = new FileOutputStream(file);) { new Thread() { @Override public void run() { try { out.write(data); } catch (IOException e) { // error } } }.start(); } catch (IOException e) { // error } } ฒߦੑʹ͓͚ΔHPUP USZXJUISFTPVSDFTͷதͰεϨου Λىಈͯ͠PVUʹ৮ͬͯ΋ඞͣDMPTFࡁ ΈͳͷͰΤϥʔʹͳΔ

©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑΛߏ଄Խ͢Δ fun showProfile(id: Int)
{ launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } }

©2018 Lang-8 Inc. ALL Rights Reserved. ฒߦੑΛߏ଄Խ͢Δ fun showProfile(id: Int)
{ launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } 1BSFOU4DPQF $IJME4DPQF MBVODI BTZOD BTZOD

©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺ fun showProfile(id: Int)
{ launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } UISPX&YDFQUJPO

©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺ fun showProfile(id: Int)
{ launch { try { coroutineScope { val profile = async { getProfile(id) } val tickets = async { getTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } } catch (e: Exception) { view.showError(e) } } } ࢠείʔϓ͕ऴྃ͠ྫ֎͕ඈΜͰ͘Δ

©2018 Lang-8 Inc. ALL Rights Reserved. DPSPVUJOF4DPQFؔ਺͕ͳ͔ͬͨΒ fun showProfile(id: Int)
{ launch { try { val profile = async { requestProfile(id) } val tickets = async { requestTicket(profile.id) } view.showProfile(profile.await(), tickets.await()) } catch (e: Exception) { view.showError(e) } } }

©2018 Lang-8 Inc. ALL Rights Reserved. ฒྻॲཧΛॻ͘ wίϧʔνϯͷதͰίϧʔνϯ ෼ذ Λىಈ͢Δ৔
߹͸DPSPVUJOF4DPQFؔ਺Λ࢖͏ είʔϓͷ ֊૚ߏ଄Λߟ͑Δ wMBVODIBTZODΛωετͯ͠Δ࣌͸஫ҙ w෼ذ͕Τϥʔʹͳͬͯ΋είʔϓΛܧଓͰ͖Δ TVQFSWJTPS4DPQFؔ਺͕͋Δ ࠓճ͸লུ IUUQTLPUMJOHJUIVCJPLPUMJOYDPSPVUJOFTLPUMJOYDPSPVUJOFTDPSFLPUMJOYDPSPVUJOFTTVQFSWJTPSTDPQFIUNM

©2018 Lang-8 Inc. ALL Rights Reserved. 3Y+BWBͱͷ౷߹ wLPUMJOYDPSPVUJOFTSYΛ࢖͏ w4JOHMF .BZCF
$PNQMFUBCMFͳͲΛ TVTQFOEؔ਺ʹͰ͖Δ wTVTQFOEؔ਺Λ4JOHMF .BZCF $PNQMFUBCMFͳͲͰ͖Δ IUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTUSFFNBTUFSSFBDUJWFLPUMJOYDPSPVUJOFTSY

©2018 Lang-8 Inc. ALL Rights Reserved. 4JOHMFΛTVTQFOEؔ਺ʹ͢Δ interface RemoteService {
@GET("/profile") fun getProfile(id: Int): Single<Profile> } val profile = withContext { service.getProfile(id).await() } 4JOHMFͷ֦ுؔ਺ʹ BXBJU ͕௥Ճ͞Ε͍ͯΔ

©2018 Lang-8 Inc. ALL Rights Reserved. 3Y+BWBXJUI$PSPVUJPOF w LPUMJOYDPSPVUJOFTSYͰ૬ޓͷΠϯςάϨʔγϣ ϯ͕Մೳ
w ྫ͑͹ෳࡶʹ߹੒͕ඞཁͳՕॴͳͲ͸ίϧʔνϯͰϑϥο τʹॻ͍ͯ࠷ޙʹ4JOHMFʹ͢Δͱ͔͕͍͍͔΋ w ରཱ͢Δ΋ͷͰ͸ͳ͍ͷͰ͍͍ײ͡ʹ࢖͏ͷ͕ྑ͍ ͓͢ ͢Ί͸4JOHMF .BZCF $PNQMFUBCMFͷஔ͖׵͑

©2018 Lang-8 Inc. ALL Rights Reserved. 8PSL.BOBHFSͱ$PSPVUJOF8PSLFS class MyWorker(context: Context,
param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } }

param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } EP8PSLؔ਺͕TVTQFOEؔ਺ʹͳΔ

param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ΦʔόʔϥΠυͰ͖Δɻ σϑΥϧτ͸%JTQBUDIFST%FGBVMU

param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ໭Γ஋͕8PSLFSͱ͸ҟͳΔɻ PVUQVU%BUBΛ໌ࣔతʹ౉͢ඞཁ͕͋Δ

param: WorkerParameters) : CoroutineWorker(context, param) { override val coroutineContext = Dispatchers.IO override suspend fun doWork(): Payload { return Payload(Result.SUCCESS) } } ໭Γ஋͕8PSLFSͱ͸ҟͳΔɻ PVUQVU%BUBΛ໌ࣔతʹ౉͢ඞཁ͕͋Δ public Payload(@NonNull Result result, @NonNull Data output) { mResult = result; mOutput = output; }

©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ @Dao interface UserDao
{ @Insert suspend fun insert(user: User) @Update suspend fun update(user: User) @Query("SELECT * FROM user") suspend fun getAllUsers(): List<User> @Delete suspend fun delete(user: User) }

©2018 Lang-8 Inc. ALL Rights Reserved. 3PPNͱTVTQFOEؔ਺ val job =
Job() val scope = CoroutineScope(Dispatchers.Main + job) scope.launch { try { val dao = db.userDao() dao.insert(User(firstName = "Jack", lastName = "Jill")) // do something } catch (e: java.lang.Exception) { // insert error } }

Job() val scope = CoroutineScope(Dispatchers.Main + job) scope.launch { try { val dao = db.userDao() dao.insert(User(firstName = "Jack", lastName = "Jill")) // do something } catch (e: java.lang.Exception) { // insert error } } ಺෦ͰXJUI$POUFYUؔ਺͕ݺͼग़͞ΕΔ

Job() val scope = CoroutineScope(Dispatchers.Main + job) scope.launch { try { val dao = db.userDao() dao.insert(User(firstName = "Jack", lastName = "Jill")) // do something } catch (e: java.lang.Exception) { // insert error } } ಺෦ͰXJUI$POUFYUؔ਺͕ݺͼग़͞ΕΔ 3PPNͷ2VFSZ&YFDVUPSΛ %JTQBUDIFSʹ͍ͯ͠Δ

©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ2VFSZ&YFDVUPS val db =
Room.databaseBuilder( applicationContext, AppDatabase::class.java, "database-name" ).apply { val dispatcher = Dispatchers.IO if (dispatcher is ExecutorCoroutineDispatcher) { setQueryExecutor(dispatcher.executor) } }.build()

©2018 Lang-8 Inc. ALL Rights Reserved. TVTQFOEؔ਺ͱ2VFSZ&YFDVUPS val db =
Room.databaseBuilder( applicationContext, AppDatabase::class.java, "database-name" ).apply { val dispatcher = Dispatchers.IO if (dispatcher is ExecutorCoroutineDispatcher) { setQueryExecutor(dispatcher.executor) } }.build() 3PPN#VJMEFSͰ&YFDVUPSΛઃఆͰ͖Δ

©2018 Lang-8 Inc. ALL Rights Reserved. ·ͱΊ w ίϧʔνϯ͸লϝϞϦɺॻ͖΍͍͢ ಡΈ΍͍͢
ɺϥΠϒϥϦͱ ͯ͠΋ܰྔ w $PSPVUJOF4DPQFͱϥΠϑαΠΫϧΛ࣋ͭίϯϙʔωϯτΛ૊ Έ߹Θͤͯ࢖͏ w ୯७ͳඇಉظॲཧ͸XJUI$POUFYUؔ਺Ͱେ఍͸ΧόʔͰ͖Δ w ฒྻͰίϧʔνϯΛىಈ͢Δ৔߹͸είʔϓͷ֊૚Λҙࣝ͢Δඞ ཁ͕͋Δɻ w 3Yͱ͸ରཱ͠ͳ͍ɻҰ෦ͷॲཧ͕ஔ͖׵͕͑Ͱ͖Δ͔΋ w +FUQBDLͰ΋ଓʑαϙʔτ͕ਐΜͰಋೖ͠΍͘͢ͳ͖͍ͬͯͯΔ

Androidと非同期処理 とCoroutine1.0.0

Androidと非同期処理 とCoroutine1.0.0

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Androidと非同期処理とCoroutine1.0.0

Androidと非同期処理とCoroutine1.0.0