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,PUMJOॳ৺ऀ͕
(PPHMF1MBZ#JMMJOH-JCSBSZΛ
ͬͯΈͨ
ू·Ε,PUMJO͖ʂ,PUMJOѪձWPM
#JU[$P
-UEଜ্༤
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$PDPBTXJGU
w ΄΅ຖ݄ɺାίϫʔΩϯάεϖʔε0QFO0⒏DF
'03&45Ͱ։࠵ͯ͠·͢ɻ
w NBD04J04XBUDI04UW04"OESPJEϓϩάϥϚʔͷͨ
ΊͷษڧձͰ͢ɻ
w ϓϩάϥϜʹؔ͢ΔࣝܦݧΛڞ༗Λతͱ͍ͯ͠·
͢ɻ
w ձͷ׆ಈ༰ൃදࢿྉɺαϯϓϧίʔυެ։Λલఏ
ͱ͍ͯ͠·͢ɻ
w ਃ͠ࠐΈɺDPOOQBTT͔Βɻ
https://cocoa-kanto.connpass.com/
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w ࡛ۄݝேբࢢͰιϑτϋεΛىۀɻ
w NBD04J04ɺ"OESPJEͷΞϓϦέʔγϣϯ։ൃΛओʹ͚ෛ͏ɻ
w ࣗࣾΞϓϦͷ࡞ɻ
w 5XJUUFS!N@ZVLJP
w 'BDFCPPLZVLJPNVSBLBNJ
w (JU)VCNVSBLBNJ
w IUUQXXXCJU[DPKQXFCMPH
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,PUMJOΛબΜͰΈ͕ͨ
w "OESPJEͷୈҰڃͷαϙʔτݴޠ
w 4XJGUͰ͖ΕΕΔΑ
w "QQMFͦ͏͚ͩͲɺ(PPHMF,PUMJOFͰใΛ
ग़͍ͯ͠ΔͷͰɺ,PUMJOͰ͠ΐ
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(PPHMF1MBZ#JMMJOH-JCSBSZ
5SJWJBM%SJWFWαϯϓϧΞϓϦ
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ߏʹ͍ͭͯ
w ෳਓͰ։ൃ͢Δ߹ɺͲΜͳߏʹ͢Δͷ͔ܾ
Ίͳ͍ͱ͍͚ͳ͍ɻ
w ݸਓతʹɺγεςϜఏڙଆʢ(PPHMFʣ͕ਪ͢
ΔͷΛૉʹ࠾༻Ͱ͍͍ͱࢥ͍ͬͯ·͕͢ɺ
͍͠Ͱ͢Ͷɻ
w ྫ͑ɺ"OESPJE+FUQBDLίϯϙʔωϯτ
w -JWF%BUB7JFX.PEFͳͲ
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Τϥʔͷѻ͍
w USZDBUDIආ͚͍ͨɻ
w TFBMFEDMBTTΛͬͯɺΓʹ݁Ռσʔλͱ
ΤϥʔใΛؚΊΔɻ
w άϩʔόϧͳྫ֎ϋϯυϥΛར༻͢Δɻ
https://github.com/Kotlin/KEEP/blob/master/proposals/
stdlib/result.md#error-handling-style-and-exceptions
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sealed class FindUserResult {
data class Found(val user: User) : FindUserResult()
data class NotFound(val name: String) : FindUserResult()
}
fun findUserByName(name: String): FindUserResult {
....
if (ݟ͔ͭͬͨ) return FindUserResult.Found(user)
else return FindUserResult.NotFound(name)
}
val result = findUserByName("bitz")
when (result) {
is FindUserResult.Found -> println("find ${result.user}")
is FindUserResult.NotFound ->println("find ${result.name}")
}
ϓϥΠϚϦίϯετϥΫλ
͜ΕܧঝͳΜͰ͢Ͷʂ
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7JFX.PEFM
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-JWF%BUB "OESPJE൛,FZ7BMVF0CTFSWJOH͔
-JWF%BUB
7JFX.PEFM
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IUUQTHJUIVCDPNBOESPJEQMBZCJMMJOHTBNQMFT
class MakePurchaseFragment : Fragment() {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
billingViewModel = ViewModelProviders.of(this).get(BillingViewModel::class.java)
billingViewModel.purchasesLiveData.observe(this, Observer {
it?.let { purchasesAdapter.setPurchases(it) }
})
}
}
7JFX.PEFM
-JWF%BUB
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class BillingViewModel(application: Application) : AndroidViewModel(application) {
val gasTankLiveData: LiveData
init {
repository = BillingRepository.getInstance(application)
repository.startDataSourceConnections()
purchasesLiveData = repository.purchasesLiveData
}
override fun onCleared() {
super.onCleared()
repository.endDataSourceConnections()
viewModelScope.coroutineContext.cancel()
}
}
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ͷσʔλͱ7JFX.PEFMར༻
ଆΛ݁ͼ͚ͭΔ
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class BillingRepository private constructor(private val application: Application) :
PurchasesUpdatedListener, BillingClientStateListener {
lateinit private var playStoreBillingClient: BillingClient
val purchasesLiveData = mutableListOf>()
fun demo() {
purchasesLiveData.setValue(ߋ৽͢Δ)
}
}
࣮ࡍͷίʔυͰɺઌ΄Ͳͷ3FTVMUܕͰޭ
ͳΒσʔλΛࣦഊͳΒΤϥʔใΛฦ͢Α͏
ʹͨ͠ɻ
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