Kotlin 2.0が与えるAndroid開発の進化

by Masayuki Suda

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Kotlin 2.0͕༩͑ΔAndroid։ൃͷਐԽ 2024.09.12 Masayuki Suda © LINE Digital Frontier Corporation

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໨࣍ 01. ΠϯτϩμΫγϣϯ 04. Stabilized Features 05. Test Experimence 02. Kotlin 2.0 migration 03. K2Compiler 06. Jetpack Compose 1.1 ࣗݾ঺հ 1.2 kotlin2.0 overview 4.1 Enum entries Stable 4.2 Auto Closeable 5.1 Power Assert 2.1 kotlin2.0΁ͷmigrationํ๏ 2.2 kapt͔Βksp΁ͷҠߦํ๏ 3.1 ֓ཁ 3.2 Smart Castͷվળ 3.3 BackingFieldsͷਐԽ 6.1 Strong Skip Mode

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ΠϯτϩμΫγϣϯ 01. ࣗݾ঺հ kotlin2.0 Overview for mobile engineer

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1.1 ࣗݾ঺հ LINE Digital Frontierגࣜձࣾ ɹɹMasayukiSuda ɹɹdaasuu

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1.1 ࣗݾ঺հ LINE Digital Frontier גࣜձࣾͱ͸

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Kotlin 2.0 OverView ɾK2 Compiler ɾCompose Multiplatform ɾKotlin Native ɾStabilized Features ɾTest Experience ɾJetpack Compose

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Kotlin 2.0 OverView ɾK2 Compiler ɾCompose Multiplatform ɾKotlin Native ɾStabilized Features ɾTest Experience ɾJetpack Compose

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Kotlin 2.0΁ͷmigration 02. ΑΓ௚ײతͳcodeʹ

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Kotlin 2.0΁ͷmigration ɾBump up 2.0 ɾ.gitignore ͷߋ৽ ɾComposeͷߋ৽ ɾKotlin Optionͷߋ৽ ɾAndroid Studio K2 Compilerͷ༗ޮԽ ɾkapt͔Βksp΁ͷҠߦ Kotlin 2.0΁ͷmigration

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Kotlin 2.0΁ͷmigration kotlin ͷversionΛ2.0.0΁

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Kotlin 2.0΁ͷmigration ksp ͷversionΛ2.0.0΁

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Kotlin 2.0΁ͷmigration Jetpack Composeͷ৽͍͠ґଘઌΛ௥Ճ Kotlinͱಉ࣌ʹversion up͕Մೳʹ

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Kotlin 2.0΁ͷmigration ϓϩδΣΫτͷϧʔτ build.gradle.kts ʹґଘΛ௥Ճ

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Kotlin 2.0΁ͷmigration Compose Λ࢖༻͢Δ֤ϞδϡʔϧͰɺϓϥάΠϯΛద༻

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Kotlin 2.0΁ͷmigration kotlinCompilerExtensionVersionΛ࡟আ

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Kotlin 2.0΁ͷmigration .kotlinΛ௥Ճ

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Kotlin 2.0΁ͷmigration kotlinOptionsΛɺkotlinͷcompilerOptionsʹॻ͖׵͑

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Kotlin 2.0΁ͷmigration Setting → Language & Frameworks → Kotlin → Enable K2 Kotlin Mode

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Kotlin 2.0΁ͷmigration Enable K2 Kotlin Mode In IntelliJ IDEA 2024.1ͰରԠࡁΈɹྫ ɾCode highlighting & Code completion. ɾNavigation ɾBasic refactorings ɾDebugging

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Kotlin 2.0΁ͷmigration Enable K2 Kotlin Mode In IntelliJ IDEA 2024.1ͰະରԠɹྫ ɾAndroid Project ɾKotlin Multiplatform projects ɾJava-to-Kotlin conversion ɾCode analysis in .gradle.kts files

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Kotlin 2.0΁ͷmigration IntelliJ IDEA 2024.3ͰશͯରԠ͢Δ༧ఆ🎉

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Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ ɾ࢖༻͍ͯ͠ΔϥΠϒϥϦ͕KSPʹରԠ͍ͯ͠Δ͔֬ೝ͢Δ ɾKSPϓϥάΠϯΛϓϩδΣΫτʹ௥Ճ͢Δ ɾΞϊςʔγϣϯϓϩηοαΛKSPʹஔ͖׵͑Δ ɾkaptϓϥάΠϯΛ࡟আ͢Δ

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Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ DataBindingͷҠߦํ๏ ɾJetpack Compose ɾView Binding

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Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ DataBindingͷҠߦํ๏ ɾJetpack Compose ɹɾҠߦίετ͸ඇৗʹߴ͍ ɹɾGoogle͕ެࣜʹਪ͍ͯ͠Δ ɹɾҠߦޙʹcodeྔ͕ݮΔՄೳੑ͕ߴ͍

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Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ DataBindingͷҠߦํ๏ ɾView Binding ɹɾAnnotation ProcessorΛ࢖༻͍ͯ͠ͳ͍ ɹɾҠߦίετ͸JetPack ComposeఔͰ͸ͳ͍

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Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ MigrateDataBindingToViewBindingPlugin

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K2 Compiler 03. ਐԽͨ͠Kotlin Compiler

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K2 Compiler Kotlin Compilerͱ͸ ɾKotlinίʔυΛ࣮ߦՄೳͳܗࣜʹม׵͠ɺܕνΣοΫ΍࠷దԽΛߦ͏ ɾେ͖͘෼͚ͯɺFrontendͱBackendͷΞʔΩςΫνϟ͔ΒͳΔ ɾFrontend ɾίʔυͷղੳɺߏจ෼ੳɺܕνΣοΫΛ୲౰͠·͢ ɾBackend ɾϓϥοτϑΥʔϜݻ༗ͷίʔυʢJVMόΠτίʔυɺJavaScriptɺωΠςΟ ϒόΠφϦͳͲʣΛੜ੒͠·͢

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K2 Compiler K2 CompilerͷਐԽ ɾFrontendͷΞʔΩςΫνϟʹେ෯มߋ͋Γ ɾܕਪ࿦΍ݺͼग़͠ղܾ͕ਐԽ͠ɺSmart Cast͕վળ ɾߴ଎Խ ɾैདྷͱൺ΂ͯ࠷େ2ഒͷίϯύΠϧͷ଎౓վળ͕࣮ࢪ ※ୠ͠kaptͷ࢖༻͕࢒͍ͬͯͨΓJavaͳͲ͕࢒͍ͬͯͨ৔߹͸Ϗϧυϓϩ ηε͕ෳࡶʹͳΔͨΊɺߴ଎ԽͷԸܙΛड͚ΒΕ·ͤΜɻ ɾIDEͷύϑΥʔϚϯε΋޲্

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Smart CastͷਐԽ K2 Compiler

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K2 Compiler Smart Castͷվળ ɾϩʔΧϧม਺ͱ͞ΒͳΔείʔϓ ɾ࿦ཧ࿨ԋࢉࢠΛ࢖༻ͨ͠ܕνΣοΫ ɾΠϯϥΠϯؔ਺ ɾؔ਺ܕͷϓϩύςΟ ɾΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ

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K2 Compiler Smart Castͷվળ̍ɹϩʔΧϧม਺ͱ͞ΒͳΔείʔϓ ৚݅จͷલʹએݴͨ͠ม਺͸Smart Cast͞ΕΔΑ͏ʹ Ver 1.9.24 Ver 2.0.0

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K2 Compiler

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K2 Compiler Smart Castͷվળ2ɹ࿦ཧ࿨ԋࢉࢠΛ࢖༻ͨ͠ܕνΣοΫ Ver 1.9.24 2.0ΑΓલ͸AnyܕʹSmart Cast

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K2 Compiler Smart Castͷվળ2ɹ࿦ཧ࿨ԋࢉࢠΛ࢖༻ͨ͠ܕνΣοΫ Ver 2.0.0 Orԋࢉࢠʢ||ʣͰܕνΣοΫΛ૊Έ߹ΘͤΔͱɺڞ௨ͷsuper typeʹ Smart Cast

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K2 Compiler

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K2 Compiler Smart Castͷվળ3ɹΠϯϥΠϯؔ਺ ΠϯϥΠϯؔ਺Λͦͷ৔Ͱݺͼग़͢ͱݟͳ͠ɺม਺ΛSmart Cast Ver 1.9.24 Ver 2.0.0

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K2 Compiler Smart Castͷվળ4ɹؔ਺ܕͷϓϩύςΟ ؔ਺ܕͷΫϥεϓϩύςΟ͕Smart Cast͞Εͳ͍ όά͕मਖ਼ Ver 1.9.24 Ver 2.0.0

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K2 Compiler Smart Castͷվળ4ɹؔ਺ܕͷϓϩύςΟ

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K2 Compiler Smart Castͷվળ5ɹΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ Ver 1.9.24 Ver 2.0.0 ਺஋ܕͷૢ࡞͕؆୯ʹͳΓɺܕม׵ͷඞཁ͕ݮΓ·͢ɻ

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K2 Compiler Smart Castͷվળ5ɹΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ Ver 1.9.24 Ver 2.0.0 Nullableͷ৔߹΋গͳ͍هड़Ͱॻ͘͜ͱ͕Մೳʹ

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K2 Compiler Smart Castͷվળ5ɹΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ

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BackingFieldsͷਐԽ K2 Compiler

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Backing Fields Ҏલ·ͰͷStateFlowΛViewModelͰ࢖͏ࡍͷهड़

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Backing Fields Privateͷม਺͕ෆཁʹ🎉

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Backing Fields Ҏલ·ͰͷLiveDataΛViewModelͰ࢖͏ࡍͷهड़

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Backing Fields Privateͷม਺͕ෆཁʹ🎉

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Backing Fields ࢖༻͢Δmoduleͷbuild.gradleʹهड़

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Stabilized Features 04. ΑΓ҆શͳCode΁

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Enum entries Stable

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Enum emtries Stable entriesΑΓҎલͷؔ਺

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Enum emtries Stable ɾvalues()Ͱ͸ɺؔ਺͕call͞ΕΔ౓ʹArrayList͕ੜ੒ ɾentriesͰ͸ಉ͡ListΛຖճฦ͢Α͏ʹ

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AutoCloseable

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AutoCloseable ϦιʔεΛࣗಈతʹղ์͢ΔͨΊͷ interface

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AutoCloseable Closeableͱͷҧ͍ ɾCloseable: I/O ૢ࡞ʹಛԽͨ͠ΠϯλʔϑΣʔεͰɺ IOException ͷΈΛѻ͏ɻ ɾAutoCloseable: ൚༻తͳϦιʔε؅ཧΠϯλʔϑΣʔεͰɺྫ ֎ॲཧ΋ॊೈɻ

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AutoCloseable AutoCloseable͕ͳ͔ͬͨ৔߹

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AutoCloseable AutoCloseable͕ͳ͔ͬͨ৔߹

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AutoCloseable AutoCloseableΛద༻͢Δ৔߹

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AutoCloseable ɾ໌ࣔతʹϦιʔεΛด͡ͳͯ͘΋ྑ͍ ɾ֦ுؔ਺ͷuse͕࢖͑ΔΑ͏ʹͳΔ

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AutoCloseable Javaͱͷޓ׵ੑ΋͋ΔͷͰɺSDK౳Λ࡞Δࡍʹ΋˕

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Test Experimence 05. Power Assert

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Power Assert Power Assertͷͳ͍ɺUnit Test͕མͪͨ࣌

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Power Assert Power Assertͷͳ͍ɺUnit Test͕མͪͨ࣌ Failed message͸ඇৗʹγϯϓϧ

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Power Assert Power Assertͷ͋ΔɺUnit Test͕མͪͨ࣌

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Power Assert Power Assertͷ͋ΔɺUnit Test͕མͪͨ࣌ ৄࡉͳFailed message͕දࣔ

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Power Assert Kotlin 2.0͔Βਖ਼ࣜʹ Kotlin͕αϙʔτ🎉🎉

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Power Assert ࢖༻͢Δmoduleͷpluginsʹ௥Ճ

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Power Assert JUnitͰ͸ͳ͘ɺKotlinͷtestΛ dependenciesʹ௥Ճ

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Power Assert ࢖༻͢Δmoduleʹ௥Ճ

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Power Assert

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Power Assert

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Power Assert test message

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Power Assert test message

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Power Assert test message

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Power Assert test message

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Power Assert test message

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Power Assert test message

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Power Assert test message

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Power Assert ListΛ࢖͏ςετͷύλʔϯ

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Power Assert Listͷத਎΋ग़ྗͯ͘͠ΕΔ🎉🎉

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Jetpack Compose 06. Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode enabled by default Kotlin 2.0.20Ͱͷมߋ఺

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Strong Skip ModeͰมߋ͞ΕΔࣄ ɾComposableؔ਺ͷRecomposeͷ৚݅ ɾlambdaࣜͷ࠶ੜ੒ͷ৚݅ Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode Row item1 item2 item3 item1Λߋ৽ Row item1 item2 item3 Recompose Recompose Skip Skip Recomposeͱ͸ ɾUIͷҰ෦͕ঢ়ଶͷมԽʹԠͯ͡࠶ඳը͞ΕΔϓϩηε

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Jetpack Compose Strong Skip Mode UnstableͳҾ਺Λitem2, 3͕࢖͍ͬͯΔͱ ঢ়ଶ͕มߋ͍ͯ͠ͳͯ͘΋࠶ඳը͕͞Εͯ͠·͏ Row item1 item2 item3 item1Λߋ৽ Row item1 item2 item3 Recompose Recompose Recompose Recompose

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StableͱUnStable Kotlin 2.0.20Ͱͷมߋ఺

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Jetpack Compose Strong Skip Mode Stableͳྫ ϓϦϛςΟϒ஋ จࣈྻ Stableͳ஋Ͱߏ੒͞Ε ͨImmurableͳclass

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Jetpack Compose Strong Skip Mode Unstableͳྫᶃ List΍Set mutableͳclass Throwable΍Date

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Jetpack Compose Strong Skip Mode Unstableͳྫᶄ Compose Λ࢖༻͍ͯ͠ͳ͍module΍֎෦libraryͷ classΛ࢖༻

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Jetpack Compose Strong Skip Mode Strong Skip Mode͕trueͷ࣌ kotlin 2.0.20ͷҎ߱ͷRecompose

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Jetpack Compose Strong Skip Mode ɾUnstableͳҾ਺࢖༻͍ͯͯ͠΋ɺinstance͕ಉ͡Ͱ͋Ε͹ Recompose͞Εͳ͍ ɾStableͳҾ਺Λ࢖༻͍ͯͨ͠৔߹͸ڍಈ͸มΘΒͳ͍ Row item1 item2 item3 item1Λߋ৽ Row item1 item2 item3 Recompose Recompose Skip Skip

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Jetpack Compose Strong Skip Mode Strong Skip Mode͕true͔false͔Ͱڍಈ͕มΘΔྫ

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode Strong Skip Mode OFF

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Jetpack Compose Strong Skip Mode Strong Skip Mode ON

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode UnstableͳҾ਺࢖༻͍ͯͯ͠΋ɺinstance͕ಉ͡Ͱ͋Ε͹ Recompose͞Εͳ͍ UnstableͳҾ਺࢖༻͍ͯͯ͠ΒɺRecompose͞ΕΔ

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Jetpack Compose Strong Skip Mode ˏImmutableͱ@Stable Unstableͳ΋ͷΛɺStableͱcompilerʹೝࣝͤ͞Δ

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Jetpack Compose Strong Skip Mode ˏImmutableͱ@Stable Strong Skip ModeͰ΋ڍಈ͸ಉ͡ ͚ͭͨ৔߹ʹҧ͏ͷ͸ɺInstance equals == false͔ɺ Object equals == falseͰRecomposeͤ͞Δ͔ͷҧ͍

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Jetpack Compose Strong Skip Mode ˏImmutableͱ@Stable Strong Skip ModeͰ΋ڍಈ͸ಉ͡ API͔Βऔಘͨ͠ࡍ΍DB͔Βऔಘͨ͠ࡍͳͲɺಉ͡஋Ͱ΋औ ಘ࣌ʹຖճinstance͕มΘΔ৔߹͸ @ImmutableΛ࢖༻ͨ͠ํ ͕ྑ͍৔߹͕͋Δ͔΋͠Εͳ͍

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Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ

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Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ

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Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ

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Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ

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Strong Skip ModeͰมߋ͞ΕΔࣄ ɾComposableؔ਺ͷRecomposeͷ৚݅ ɾlambdaࣜͷ࠶ੜ੒ͷ৚݅ Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode Strong Skip Mode͕false ैདྷͷlambdaࣜͷ࠶ੜ੒৚݅

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Jetpack Compose Strong Skip Mode LambdaࣜͷதͰunstableͳclassΛࢀর͍ͯ͠Δͱ Recompose࣌ʹ࠶ੜ੒͞ΕΔ

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Jetpack Compose Strong Skip Mode LambdaࣜͷதͰunstableͳclassΛࢀর͍ͯ͠Δͱ Recompose࣌ʹ࠶ੜ੒͞ΕΔ

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Jetpack Compose Strong Skip Mode ҆ఆͨ͠ClassͩͱRecompose࣌ʹ࠶ੜ੒͞Εͳ͍

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Jetpack Compose Strong Skip Mode Strong Skip Mode͕trueͷ࣌ lambdaࣜͷ࠶ੜ੒͢Δʁ

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Jetpack Compose Strong Skip Mode LambdaࣜͷதͰunstableͳclassΛࢀর͍ͯͯ͠΋ Recompose࣌ʹ࠶ੜ੒͞Εͳ͘ͳΔ

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Jetpack Compose Strong Skip Mode Compiler͕rememberͰmemo͢ΔΑ͏ʹॻ͖׵͑ͯ͘ΕΔͨΊ Recompose࣌ʹ࠶ੜ੒͞Εͳ͘ͳΔ

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Jetpack Compose Strong Skip Mode AnnotationͷDontMemoizeΛ෇༩͢Δ͜ͱͰɺҎલͱ ಉ͡Α͏ʹ࠶ੜ੒ͤ͞Δ͜ͱ΋Մೳ

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Jetpack Compose Strong Skip Mode Strong Skip ModeͰ΋සൟʹRecompose͍ͤͨ͞

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode Strong Skip Mode ON @NonSkippableComposable

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Jetpack Compose Strong Skip Mode

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Jetpack Compose Strong Skip Mode @DontMemoizeΛLazyColumnʹ෇༩

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Jetpack Compose Strong Skip Mode Strong Skip Mode ON @NonSkippableComposable ˏDontMemoize

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Jetpack Compose Strong Skip Mode @NonSkippableComposable ɾසൟʹRecompose͍ͤͨ͞ࡍʹศར ɾؔ਺಺Ͱఆٛ͞Ε͍ͯΔlambdaΛ࠶ੜ੒ͯ͘͠Εͳ ͍৔߹͸@DontMemoizeͰղܾ

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Jetpack Compose Strong Skip Mode Strong Skip ModeΛOffʹ͍ͨ͠

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Jetpack Compose Strong Skip Mode Strong Skip ModeΛOffʹ͍ͨ͠

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Jetpack Compose Strong Skip Mode ͳͥStrong Skip Mode͕ಋೖ͞Ε͔ͨʁ ɾ౰ॳͷ૝ఆͰ͸ɺෆ҆ఆͳύϥϝʔλʔ౳͕͋ͬͨΒ ࣮֬ʹrecompose͢Δ͜ͱͰɺbugͷগͳ͍application ͕࡞੒͠΍͘͢ͳΔͱ͞Ε͍ͯͨ

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Jetpack Compose Strong Skip Mode ͳͥStrong Skip Mode͕ಋೖ͞Ε͔ͨʁ ɾReleaseΛͨ͠ΒɺͳͥRecompose͞Εͯ͠·͏ͷ͔ ͱ͍͏೰ΈΛ๊͑Δ։ൃऀ͕ଟ͍͘Δͱ͍͏ࣄଶʹͳͬ ͨɻ

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Jetpack Compose Strong Skip Mode Object equalsͱinstance equals ɾStrong Skip Mode͕ಋೖ͞ΕΔͱύϑΥʔϚϯεͰ೰ Ή͜ͱࣗମ͕ݮΔՄೳੑ͕ߴ͍ ɾObject equalsͱinstance equals͔Ͱ೰Ή͜ͱ͕૿͑Δ ͔΋ʁ

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Jetpack Compose Strong Skip Mode Object equalsͱinstance equals ɾObject equals͸O(n)ʹରͯ͠instance equals͸O(1) ɾ݅਺ͷଟ͍͍ෳࡶͳlist౳Λ๊͍͑ͯΔ৔߹͸ instance equalsͷํ͕ѹ౗తʹ଎͍

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Jetpack Compose Strong Skip Mode Object equalsͱinstance equals ɾࠓ·Ͱ͚͍ͭͯͨ@ImmutableͳͲͷAnnotationΛݟ ௚ͨ͠ํ͕ૣ͘ͳΔ͜ͱ΋͋Γͦ͏

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Special Thanks KotlinެࣜϦϑΝϨϯε https://kotlinlang.org/docs/collections-overview.html Jetpack Compose: Strong Skipping Mode Explained https://medium.com/androiddevelopers/jetpack-compose-strong-skipping-mode-explained-cbdb2aa4b900 Jetpack Compose Stability Explained https://medium.com/androiddevelopers/jetpack-compose-stability-explained-79c10db270c8 New ways of optimizing stability in Jetpack Compose https://medium.com/androiddevelopers/new-ways-of-optimizing-stability-in-jetpack-compose-038106c283cc

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