Kotlin 2.0が与えるAndroid開発の進化

DroidKaigi 2024で発表させていただくslideです。

Transcript

1. Kotlin 2.0͕༩͑ΔAndroid։ൃͷਐԽ 2024.09.12 Masayuki Suda © LINE Digital Frontier Corporation
2. ໨࣍ 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
3. ΠϯτϩμΫγϣϯ 01. ࣗݾ঺հ kotlin2.0 Overview for mobile engineer
4. 1.1 ࣗݾ঺հ LINE Digital Frontierגࣜձࣾ ɹɹMasayukiSuda ɹɹdaasuu
5. 1.1 ࣗݾ঺հ LINE Digital Frontier גࣜձࣾͱ͸
6. Kotlin 2.0 OverView ɾK2 Compiler ɾCompose Multiplatform ɾKotlin Native ɾStabilized Features ɾTest Experience ɾJetpack Compose
7. Kotlin 2.0 OverView ɾK2 Compiler ɾCompose Multiplatform ɾKotlin Native ɾStabilized Features ɾTest Experience ɾJetpack Compose
8. Kotlin 2.0΁ͷmigration 02. ΑΓ௚ײతͳcodeʹ
9. 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
10. Kotlin 2.0΁ͷmigration kotlin ͷversionΛ2.0.0΁
11. Kotlin 2.0΁ͷmigration ksp ͷversionΛ2.0.0΁
12. Kotlin 2.0΁ͷmigration Jetpack Composeͷ৽͍͠ґଘઌΛ௥Ճ Kotlinͱಉ࣌ʹversion up͕Մೳʹ
13. Kotlin 2.0΁ͷmigration ϓϩδΣΫτͷϧʔτ build.gradle.kts ʹґଘΛ௥Ճ
14. Kotlin 2.0΁ͷmigration Compose Λ࢖༻͢Δ֤ϞδϡʔϧͰɺϓϥάΠϯΛద༻
15. Kotlin 2.0΁ͷmigration kotlinCompilerExtensionVersionΛ࡟আ
16. Kotlin 2.0΁ͷmigration .kotlinΛ௥Ճ
17. Kotlin 2.0΁ͷmigration kotlinOptionsΛɺkotlinͷcompilerOptionsʹॻ͖׵͑
18. Kotlin 2.0΁ͷmigration Setting → Language & Frameworks → Kotlin → Enable K2 Kotlin Mode
19. Kotlin 2.0΁ͷmigration Enable K2 Kotlin Mode In IntelliJ IDEA 2024.1ͰରԠࡁΈɹྫ ɾCode highlighting & Code completion. ɾNavigation ɾBasic refactorings ɾDebugging
20. 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
21. Kotlin 2.0΁ͷmigration IntelliJ IDEA 2024.3ͰશͯରԠ͢Δ༧ఆ🎉
22. Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ ɾ࢖༻͍ͯ͠ΔϥΠϒϥϦ͕KSPʹରԠ͍ͯ͠Δ͔֬ೝ͢Δ ɾKSPϓϥάΠϯΛϓϩδΣΫτʹ௥Ճ͢Δ ɾΞϊςʔγϣϯϓϩηοαΛKSPʹஔ͖׵͑Δ ɾkaptϓϥάΠϯΛ࡟আ͢Δ
23. Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ DataBindingͷҠߦํ๏ ɾJetpack Compose ɾView Binding
24. Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ DataBindingͷҠߦํ๏ ɾJetpack Compose ɹɾҠߦίετ͸ඇৗʹߴ͍ ɹɾGoogle͕ެࣜʹਪ͍ͯ͠Δ ɹɾҠߦޙʹcodeྔ͕ݮΔՄೳੑ͕ߴ͍
25. Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ DataBindingͷҠߦํ๏ ɾView Binding ɹɾAnnotation ProcessorΛ࢖༻͍ͯ͠ͳ͍ ɹɾҠߦίετ͸JetPack ComposeఔͰ͸ͳ͍
26. Kotlin 2.0΁ͷmigration kapt͔Βksp΁ͷҠߦ MigrateDataBindingToViewBindingPlugin
27. K2 Compiler 03. ਐԽͨ͠Kotlin Compiler
28. K2 Compiler Kotlin Compilerͱ͸ ɾKotlinίʔυΛ࣮ߦՄೳͳܗࣜʹม׵͠ɺܕνΣοΫ΍࠷దԽΛߦ͏ ɾେ͖͘෼͚ͯɺFrontendͱBackendͷΞʔΩςΫνϟ͔ΒͳΔ ɾFrontend ɾίʔυͷղੳɺߏจ෼ੳɺܕνΣοΫΛ୲౰͠·͢ ɾBackend ɾϓϥοτϑΥʔϜݻ༗ͷίʔυʢJVMόΠτίʔυɺJavaScriptɺωΠςΟ ϒόΠφϦͳͲʣΛੜ੒͠·͢
29. K2 Compiler K2 CompilerͷਐԽ ɾFrontendͷΞʔΩςΫνϟʹେ෯มߋ͋Γ ɾܕਪ࿦΍ݺͼग़͠ղܾ͕ਐԽ͠ɺSmart Cast͕վળ ɾߴ଎Խ ɾैདྷͱൺ΂ͯ࠷େ2ഒͷίϯύΠϧͷ଎౓վળ͕࣮ࢪ ※ୠ͠kaptͷ࢖༻͕࢒͍ͬͯͨΓJavaͳͲ͕࢒͍ͬͯͨ৔߹͸Ϗϧυϓϩ ηε͕ෳࡶʹͳΔͨΊɺߴ଎ԽͷԸܙΛड͚ΒΕ·ͤΜɻ ɾIDEͷύϑΥʔϚϯε΋޲্
30. Smart CastͷਐԽ K2 Compiler
31. K2 Compiler Smart Castͷվળ ɾϩʔΧϧม਺ͱ͞ΒͳΔείʔϓ ɾ࿦ཧ࿨ԋࢉࢠΛ࢖༻ͨ͠ܕνΣοΫ ɾΠϯϥΠϯؔ਺ ɾؔ਺ܕͷϓϩύςΟ ɾΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ
32. K2 Compiler Smart Castͷվળ̍ɹϩʔΧϧม਺ͱ͞ΒͳΔείʔϓ ৚݅จͷલʹએݴͨ͠ม਺͸Smart Cast͞ΕΔΑ͏ʹ Ver 1.9.24 Ver 2.0.0
33. K2 Compiler
34. K2 Compiler Smart Castͷվળ2ɹ࿦ཧ࿨ԋࢉࢠΛ࢖༻ͨ͠ܕνΣοΫ Ver 1.9.24 2.0ΑΓલ͸AnyܕʹSmart Cast
35. K2 Compiler Smart Castͷվળ2ɹ࿦ཧ࿨ԋࢉࢠΛ࢖༻ͨ͠ܕνΣοΫ Ver 2.0.0 Orԋࢉࢠʢ||ʣͰܕνΣοΫΛ૊Έ߹ΘͤΔͱɺڞ௨ͷsuper typeʹ Smart Cast
36. K2 Compiler
37. K2 Compiler Smart Castͷվળ3ɹΠϯϥΠϯؔ਺ ΠϯϥΠϯؔ਺Λͦͷ৔Ͱݺͼग़͢ͱݟͳ͠ɺม਺ΛSmart Cast Ver 1.9.24 Ver 2.0.0
38. K2 Compiler Smart Castͷվળ4ɹؔ਺ܕͷϓϩύςΟ ؔ਺ܕͷΫϥεϓϩύςΟ͕Smart Cast͞Εͳ͍ όά͕मਖ਼ Ver 1.9.24 Ver 2.0.0
39. K2 Compiler Smart Castͷվળ4ɹؔ਺ܕͷϓϩύςΟ
40. K2 Compiler Smart Castͷվળ5ɹΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ Ver 1.9.24 Ver 2.0.0 ਺஋ܕͷૢ࡞͕؆୯ʹͳΓɺܕม׵ͷඞཁ͕ݮΓ·͢ɻ
41. K2 Compiler Smart Castͷվળ5ɹΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ Ver 1.9.24 Ver 2.0.0 Nullableͷ৔߹΋গͳ͍هड़Ͱॻ͘͜ͱ͕Մೳʹ
42. K2 Compiler Smart Castͷվળ5ɹΠϯΫϦϝϯτԋࢉࢠͱσΫϦϝϯτԋࢉࢠ
43. BackingFieldsͷਐԽ K2 Compiler
44. Backing Fields Ҏલ·ͰͷStateFlowΛViewModelͰ࢖͏ࡍͷهड़
45. Backing Fields Privateͷม਺͕ෆཁʹ🎉
46. Backing Fields Ҏલ·ͰͷLiveDataΛViewModelͰ࢖͏ࡍͷهड़
47. Backing Fields Privateͷม਺͕ෆཁʹ🎉
48. Backing Fields ࢖༻͢Δmoduleͷbuild.gradleʹهड़
49. Stabilized Features 04. ΑΓ҆શͳCode΁
50. Enum entries Stable
51. Enum emtries Stable entriesΑΓҎલͷؔ਺
52. Enum emtries Stable ɾvalues()Ͱ͸ɺؔ਺͕call͞ΕΔ౓ʹArrayList͕ੜ੒ ɾentriesͰ͸ಉ͡ListΛຖճฦ͢Α͏ʹ
53. AutoCloseable
54. AutoCloseable ϦιʔεΛࣗಈతʹղ์͢ΔͨΊͷ interface
55. AutoCloseable Closeableͱͷҧ͍ ɾCloseable: I/O ૢ࡞ʹಛԽͨ͠ΠϯλʔϑΣʔεͰɺ IOException ͷΈΛѻ͏ɻ ɾAutoCloseable: ൚༻తͳϦιʔε؅ཧΠϯλʔϑΣʔεͰɺྫ ֎ॲཧ΋ॊೈɻ
56. AutoCloseable AutoCloseable͕ͳ͔ͬͨ৔߹
57. AutoCloseable AutoCloseable͕ͳ͔ͬͨ৔߹
58. AutoCloseable AutoCloseableΛద༻͢Δ৔߹
59. AutoCloseable ɾ໌ࣔతʹϦιʔεΛด͡ͳͯ͘΋ྑ͍ ɾ֦ுؔ਺ͷuse͕࢖͑ΔΑ͏ʹͳΔ
60. AutoCloseable Javaͱͷޓ׵ੑ΋͋ΔͷͰɺSDK౳Λ࡞Δࡍʹ΋˕
61. Test Experimence 05. Power Assert
62. Power Assert Power Assertͷͳ͍ɺUnit Test͕མͪͨ࣌
63. Power Assert Power Assertͷͳ͍ɺUnit Test͕མͪͨ࣌ Failed message͸ඇৗʹγϯϓϧ
64. Power Assert Power Assertͷ͋ΔɺUnit Test͕མͪͨ࣌
65. Power Assert Power Assertͷ͋ΔɺUnit Test͕མͪͨ࣌ ৄࡉͳFailed message͕දࣔ
66. Power Assert Kotlin 2.0͔Βਖ਼ࣜʹ Kotlin͕αϙʔτ🎉🎉
67. Power Assert ࢖༻͢Δmoduleͷpluginsʹ௥Ճ
68. Power Assert JUnitͰ͸ͳ͘ɺKotlinͷtestΛ dependenciesʹ௥Ճ
69. Power Assert ࢖༻͢Δmoduleʹ௥Ճ
70. Power Assert
71. Power Assert
72. Power Assert test message
73. Power Assert test message
74. Power Assert test message
75. Power Assert test message
76. Power Assert test message
77. Power Assert test message
78. Power Assert test message
79. Power Assert ListΛ࢖͏ςετͷύλʔϯ
80. Power Assert Listͷத਎΋ग़ྗͯ͘͠ΕΔ🎉🎉
81. Jetpack Compose 06. Compose Strong Skip Mode
82. Jetpack Compose Strong Skip Mode enabled by default Kotlin 2.0.20Ͱͷมߋ఺
83. Strong Skip ModeͰมߋ͞ΕΔࣄ ɾComposableؔ਺ͷRecomposeͷ৚݅ ɾlambdaࣜͷ࠶ੜ੒ͷ৚݅ Jetpack Compose Strong Skip Mode
84. Jetpack Compose Strong Skip Mode Row item1 item2 item3 item1Λߋ৽ Row item1 item2 item3 Recompose Recompose Skip Skip Recomposeͱ͸ ɾUIͷҰ෦͕ঢ়ଶͷมԽʹԠͯ͡࠶ඳը͞ΕΔϓϩηε
85. Jetpack Compose Strong Skip Mode UnstableͳҾ਺Λitem2, 3͕࢖͍ͬͯΔͱ ঢ়ଶ͕มߋ͍ͯ͠ͳͯ͘΋࠶ඳը͕͞Εͯ͠·͏ Row item1 item2 item3 item1Λߋ৽ Row item1 item2 item3 Recompose Recompose Recompose Recompose
86. StableͱUnStable Kotlin 2.0.20Ͱͷมߋ఺
87. Jetpack Compose Strong Skip Mode Stableͳྫ ϓϦϛςΟϒ஋ จࣈྻ Stableͳ஋Ͱߏ੒͞Ε ͨImmurableͳclass
88. Jetpack Compose Strong Skip Mode Unstableͳྫᶃ List΍Set mutableͳclass Throwable΍Date
89. Jetpack Compose Strong Skip Mode Unstableͳྫᶄ Compose Λ࢖༻͍ͯ͠ͳ͍module΍֎෦libraryͷ classΛ࢖༻
90. Jetpack Compose Strong Skip Mode Strong Skip Mode͕trueͷ࣌ kotlin 2.0.20ͷҎ߱ͷRecompose
91. 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
92. Jetpack Compose Strong Skip Mode Strong Skip Mode͕true͔false͔Ͱڍಈ͕มΘΔྫ
93. Jetpack Compose Strong Skip Mode
94. Jetpack Compose Strong Skip Mode
95. Jetpack Compose Strong Skip Mode
96. Jetpack Compose Strong Skip Mode
97. Jetpack Compose Strong Skip Mode
98. Jetpack Compose Strong Skip Mode
99. Jetpack Compose Strong Skip Mode Strong Skip Mode OFF
100. Jetpack Compose Strong Skip Mode Strong Skip Mode ON
101. Jetpack Compose Strong Skip Mode
102. Jetpack Compose Strong Skip Mode UnstableͳҾ਺࢖༻͍ͯͯ͠΋ɺinstance͕ಉ͡Ͱ͋Ε͹ Recompose͞Εͳ͍ UnstableͳҾ਺࢖༻͍ͯͯ͠ΒɺRecompose͞ΕΔ
103. Jetpack Compose Strong Skip Mode ˏImmutableͱ@Stable Unstableͳ΋ͷΛɺStableͱcompilerʹೝࣝͤ͞Δ
104. Jetpack Compose Strong Skip Mode ˏImmutableͱ@Stable Strong Skip ModeͰ΋ڍಈ͸ಉ͡ ͚ͭͨ৔߹ʹҧ͏ͷ͸ɺInstance equals == false͔ɺ Object equals == falseͰRecomposeͤ͞Δ͔ͷҧ͍
105. Jetpack Compose Strong Skip Mode ˏImmutableͱ@Stable Strong Skip ModeͰ΋ڍಈ͸ಉ͡ API͔Βऔಘͨ͠ࡍ΍DB͔Βऔಘͨ͠ࡍͳͲɺಉ͡஋Ͱ΋औ ಘ࣌ʹຖճinstance͕มΘΔ৔߹͸ @ImmutableΛ࢖༻ͨ͠ํ ͕ྑ͍৔߹͕͋Δ͔΋͠Εͳ͍
106. Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ
107. Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ
108. Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ
109. Jetpack Compose Strong Skip Mode config fileͰstableΛҰׅࢦఆ
110. Strong Skip ModeͰมߋ͞ΕΔࣄ ɾComposableؔ਺ͷRecomposeͷ৚݅ ɾlambdaࣜͷ࠶ੜ੒ͷ৚݅ Jetpack Compose Strong Skip Mode
111. Jetpack Compose Strong Skip Mode Strong Skip Mode͕false ैདྷͷlambdaࣜͷ࠶ੜ੒৚݅
112. Jetpack Compose Strong Skip Mode LambdaࣜͷதͰunstableͳclassΛࢀর͍ͯ͠Δͱ Recompose࣌ʹ࠶ੜ੒͞ΕΔ
113. Jetpack Compose Strong Skip Mode LambdaࣜͷதͰunstableͳclassΛࢀর͍ͯ͠Δͱ Recompose࣌ʹ࠶ੜ੒͞ΕΔ
114. Jetpack Compose Strong Skip Mode ҆ఆͨ͠ClassͩͱRecompose࣌ʹ࠶ੜ੒͞Εͳ͍
115. Jetpack Compose Strong Skip Mode Strong Skip Mode͕trueͷ࣌ lambdaࣜͷ࠶ੜ੒͢Δʁ
116. Jetpack Compose Strong Skip Mode LambdaࣜͷதͰunstableͳclassΛࢀর͍ͯͯ͠΋ Recompose࣌ʹ࠶ੜ੒͞Εͳ͘ͳΔ
117. Jetpack Compose Strong Skip Mode Compiler͕rememberͰmemo͢ΔΑ͏ʹॻ͖׵͑ͯ͘ΕΔͨΊ Recompose࣌ʹ࠶ੜ੒͞Εͳ͘ͳΔ
118. Jetpack Compose Strong Skip Mode AnnotationͷDontMemoizeΛ෇༩͢Δ͜ͱͰɺҎલͱ ಉ͡Α͏ʹ࠶ੜ੒ͤ͞Δ͜ͱ΋Մೳ
119. Jetpack Compose Strong Skip Mode Strong Skip ModeͰ΋සൟʹRecompose͍ͤͨ͞
120. Jetpack Compose Strong Skip Mode
121. Jetpack Compose Strong Skip Mode
122. Jetpack Compose Strong Skip Mode Strong Skip Mode ON @NonSkippableComposable
123. Jetpack Compose Strong Skip Mode
124. Jetpack Compose Strong Skip Mode @DontMemoizeΛLazyColumnʹ෇༩
125. Jetpack Compose Strong Skip Mode Strong Skip Mode ON @NonSkippableComposable ˏDontMemoize
126. Jetpack Compose Strong Skip Mode @NonSkippableComposable ɾසൟʹRecompose͍ͤͨ͞ࡍʹศར ɾؔ਺಺Ͱఆٛ͞Ε͍ͯΔlambdaΛ࠶ੜ੒ͯ͘͠Εͳ ͍৔߹͸@DontMemoizeͰղܾ
127. Jetpack Compose Strong Skip Mode Strong Skip ModeΛOffʹ͍ͨ͠
128. Jetpack Compose Strong Skip Mode Strong Skip ModeΛOffʹ͍ͨ͠
129. Jetpack Compose Strong Skip Mode ͳͥStrong Skip Mode͕ಋೖ͞Ε͔ͨʁ ɾ౰ॳͷ૝ఆͰ͸ɺෆ҆ఆͳύϥϝʔλʔ౳͕͋ͬͨΒ ࣮֬ʹrecompose͢Δ͜ͱͰɺbugͷগͳ͍application ͕࡞੒͠΍͘͢ͳΔͱ͞Ε͍ͯͨ
130. Jetpack Compose Strong Skip Mode ͳͥStrong Skip Mode͕ಋೖ͞Ε͔ͨʁ ɾReleaseΛͨ͠ΒɺͳͥRecompose͞Εͯ͠·͏ͷ͔ ͱ͍͏೰ΈΛ๊͑Δ։ൃऀ͕ଟ͍͘Δͱ͍͏ࣄଶʹͳͬ ͨɻ
131. Jetpack Compose Strong Skip Mode Object equalsͱinstance equals ɾStrong Skip Mode͕ಋೖ͞ΕΔͱύϑΥʔϚϯεͰ೰ Ή͜ͱࣗମ͕ݮΔՄೳੑ͕ߴ͍ ɾObject equalsͱinstance equals͔Ͱ೰Ή͜ͱ͕૿͑Δ ͔΋ʁ
132. Jetpack Compose Strong Skip Mode Object equalsͱinstance equals ɾObject equals͸O(n)ʹରͯ͠instance equals͸O(1) ɾ݅਺ͷଟ͍͍ෳࡶͳlist౳Λ๊͍͑ͯΔ৔߹͸ instance equalsͷํ͕ѹ౗తʹ଎͍
133. Jetpack Compose Strong Skip Mode Object equalsͱinstance equals ɾࠓ·Ͱ͚͍ͭͯͨ@ImmutableͳͲͷAnnotationΛݟ ௚ͨ͠ํ͕ૣ͘ͳΔ͜ͱ΋͋Γͦ͏
134. 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
135. End Of doc.