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,PUMJOසग़දݱ !MWMB

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lvla lvla0805 Ѫᖒ๖ .PZVSV"J[BXB   -FBEFOHJOFFSPGQBJST%JWFVSFLB *OD  FVSFLB,PUMJO&WBOHFMJTU  +BWB,PUMJO3Y+BWB

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 QBJST  $PVQMFT  NBUDIHSPVQ *"$  OPXIJSJOH

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NFFUT

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WBM

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‣ SFBEPOMZ ‣ جຊWBMΛར༻͍ͯ͠Δɻ ‣ ňͦΕWBSͰ͋Δඞཁ͋Δͷ ʼn ‣ ΈΜͳ+BWBॻ࣌͘ʹpOBMΛ͚ͭΔΑ͏ʹͳͬͨ WBM val readOnliy = 10 readOnliy = 20 // error

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/VMMBCMF

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‣ /VMMΛڐ༰͢Δܕͱɺ/VMMΛڋ൱͢Δܕ͕໌֬ʹΘ͚ΒΕ͍ͯΔ ‣ OPU/VMMʹ͸OVMM͸୅ೖͰ͖ͳ͍͠ɺOVMMBCMFΛ୅ೖ͢Δ͜ͱ΋ग़དྷͳ ͍ ‣ ৗʹ/VMMΛҙࣝͯ͠ίʔσΟϯά͢Δ͜ͱʹͳΔ /VMMBCMF val nullable: String? = null var notNull: String = null // error notNull: String = nullable // error

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4BGF$BMM

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‣ /VMMBCMF͕/VMMͷ৔߹ɺOVMM͕ฦ٫͞ΕΔɻ ‣ /VMMBCMF͕/VMMͰͳ͍৔߹ɺؔ਺͕࣮ߦ͞ΕΔϓϩύςΟͷ஋͕ฦ٫ ͞ΕΔɻ 4BGF$BMM nullablePerson?.toString() nullablePerson?.age

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%FMFHBUFE1SPQFSUJFT

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‣ ϓϩύςΟͷॳظԽΛҕৡͰ͖Δ ‣ ॳظԽΛ஗ԆͰ͖Δ ‣ ϥΠϑαΠΫϧʹґଘ͢Δ΋ͷͰ΋WBMͰॳظԽͰ͖Δ %FMFHBUFE1SPQFSUJFT val view by bindView(R.id.view) val string by lazy { getString(R.string.foo) }

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&YUFOTJPO'VODUJPO

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‣ ܧঝ͢Δࣄͳ͘ɺطଘΫϥεʹؔ਺Λ௥ՃͰ͖Δɻ &YUFOTJPO'VODUJPO fun Activity.toWeb(uri: Uri) { startActivity( Intent(Intent.ACTION_VIEW, uri) ) } fun Subscription.addTo(subscriptions: CompositeSubscription) { subscriptions(this) }

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4JOHMF&YQSFTTJPO'VODUJPO

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‣ ؔ਺ͷ࣮૷͕୯Ұࣜͷ৔߹ɺฦΓ஋ͷએݴɺϒϩοΫɺSFUVSOΛলུ Ͱ͖Δɻ 4JOHMF&YQSFTTJPO'VODUJPO @Provide fun provideApplicationContext() = applicationContext

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)JHIFS0SEFS'VODUJPO

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‣ ؔ਺ΛҾ਺ʹͱͬͨΓ ‣ ؔ਺Λฦ٫͢Δؔ਺ ‣ +BWB͸ؔ਺͕ϑΝʔετΫϥεΦϒδΣΫτ͡Όͳ͍͔Β͜Ε͕Ͱ͖ ͳ͍ )JHIFS0SEFS'VODUJPO fun foo( function: (Int)->Unit ) { … } fun bar(): (Int)->String { … }

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‣ 7JFXΛҾ਺ʹͱΓ6OJU 㲈7PJE Λฦ٫͢Δؔ਺ͱಉ౳Ͱ͸ 4". public interface OnClickListener { void onClick(View var1); }

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‣ ؔ਺ͭͷΠϯλʔϑΣʔεΛҾ਺ʹऔΔؔ਺ʹ͸ɺؔ਺Λ౉ͤ·͢ ‣ هड़ྔΊͬͪΌݮΔʜ 4". view.setOnClickListener({ view -> view.visibility = View.GONE }) view.setOnClickListener { view -> view.visibility = View.GONE } view.setOnClickListener { it.visibility = View.GONE }

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MFU

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‣ ؔ਺Λ౉͢ͱɺͦͷؔ਺Λ࣮ߦͯ͘͠ΕΔɻ ‣ 4BGF$BMMͰMFUΛ࣮ߦ͍ͯ͠ΔͷͰɺOVMMͰͳ͍৔߹ʹͷΈ࣮ߦ͞Ε Δɻ MFU nullable?.let { it.doSomething }

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BQQMZ

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‣ Ϩγʔό 'PP'SBHNFOU ͷϓϩύςΟ΍ؔ਺Λར༻͢Δؔ਺Λ౉͢ ‣ ͦΕΒ͕ద༻͞ΕͨϨγʔό͕ฦ٫͞ΕΔɻ BQQMZ FooFragment().apply { arguments = Bundle().apply { pustString("key", "value") } }

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‣ 4JOHMF&YQSFTTJPO'VODUJPOͱ૊Έ߹ΘͤΔͱ͖ͬ͢Γ BQQMZ fun newInstance() = FooFragment().apply { arguments = Bundle().apply { pustString("key", "value") } }

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EFDMBSJOHQSPQFSUJFTBOE JOJUJBMJ[JOHUIFNGSPNQSJNBSZ DPOTUSVDUPS

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‣ ϓϩύςΟͷએݴͱॳظԽΛɺϓϥΠϚϦίϯετϥΫλͰߦ͑Δ ‣ ϗϯτָʜ EFDMBSJOHQSPQFSUJFTBOEJOJUJBMJ[JOHUIFNGSPNQSJNBSZDPOTUSVDUPS class Person(val firstName: String, val lastName: String, var age: Int) { // ... }

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%BUB$MBTT

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‣ FRVBMT IBTI$PEF UP4USJOH DPQZ ΛίϯύΠϧ࣌ʹੜ੒ͯ͠ ͘ΕΔ ‣ Ξοϓσʔτ͞Εͳ͍FRVBMT ͱ͞Α͏ͳΒͰ͖Δɻ %BUB$MBTT data class Person(val firstName: String, val lastName: String, var age: Int)

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OUBSPLOJU

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‣ ֦ுؔ਺Λ࢖ͬͯBTTFSU5IBUΛ͍͍ײ͡ʹͯ͘͠ΕΔ ‣ ΋͏͜Ε͕ͳ͍ͱςετ͸ॻ͚ͳ͍ʜ LOJU @Test fun test() { (1 + 2).should be 3 // assertThat(1 + 2, `is`(3)) }

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TZTZBHJLNPDLJUP

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‣ ֦ுؔ਺Λ࢖ͬͯNPDLJUPΛ͍͍ײ͡ʹͯ͘͠ΕΔɻ ‣ ͜Ε΋ͳ͍ͱςετͰ͖ͳ͍ʜ LNPDLJUP var item: Item = mock() item.length().invoked.thenReturn(10) item.length().should be 10 item.verify().length()

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5IBOLZPV