Kotlin Multiplatformで実現するクロスプラットフォームの卓越性

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1. ΧϦϧɹηϧδΦ TechLead | Sony ιχʔͷKotlin Multiplatform Kotlin MultiplatformͰ࣮ݱ͢ΔΫϩεϓϥοτϑΥʔϜͷ୎ӽੑ
2. About me Engineer Agilist
3. 1. iOS & Android 2. Background 3. Leverage knowledge Requirements 2019
4. 2019 2020 2021 2022 2023 2024 180.000 MAU Fast releases 3 apps
5. Requirements Decision making Success W/ KMP A Blueprint
6. Agenda 1. AutoPlay app 2. AutoPlay in “Sony | Sound Connect” 3. Decision making 4. Key points
7. 1. AutoPlay App with Kotlin Multiplatform
8. 2021 2022 2023 2024 2025 Dev Market Market AutoPlay Dev
9. Auto Play Supported Devices
10. AutoPlay Sensing Context Action data trigger
11. Sensing Context Action Android / iOS Background Hardware Knowhow
12. Kotlin Multiplatform (KMP) Native UIs Kotlin Multiplatform logic Bytecode LLVM JavaScript JVM Native JS
13. expect/actual Common expect fun / class actual fun / class actual fun / class
14. expect fun randomUUID: String import java.util.* actual fun randomUUID() = UUID.randomUUID().toString() import platform.Foundation.NSUUID actual fun randomUUID(): String = NSUUID().UUIDString() Common expect/actual
15. Requirements 1. iOS & Android 2. Background 3. Leverage knowledge 4. Hardware integration
16. AutoPlay w/ KMP
17. • 20,000 MAU • Fast high-quality releases Successes • Build system • Dev. Environment • Skillset Challenges
18. 2. AutoPlay in Sony | Sound Connect with Compose Multiplatform
20. ~2024/10 Architecture Build system Architecture Build system Users
21. 2024/10~ Architecture Architecture Build system Users
22. Requirements 1. iOS & Android 2. Background 3. Leverage knowledge 4. Hardware integration 5. Simplify building system
23. Compose Multiplatform https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-multiplatform-and-jetpack-compose.html Jetpack Compose KMP
24. https://www.youtube.com/watch?v=0L1VFm7o4MU KMP Compose MP
25. AutoPlay w/ Compose Multiplatform
26. Code Base Old AutoPlay New AutoPlay
27. • 2 releases • 155,000+ MAU • Narrow skillset Successes • NA (too early) Challenges
28. 3. Decision Making and lessons learned
29. Platform analysis
30. Sony Adoption 2019 2020 2021 2022 2023 2024 Kotlin 1.3: Alpha M P KM M introduced (Beta) KM P Stable C om pose iO S Alpha C om pose iO S Beta
31. Decision Making 1. Use-case based 2. Tooling 3. Ecosystem 4. Community Experimentation
32. KMP Adoption https://developers.googleblog.com/en/google-kotlinconf-2024-a-look-inside-multiplatform-development-with-kmp-and-more/
33. T he State of KMP AutoPlay 1.0 https://blog.jetbrains.com/kotlin/2023/11/kotlin-multiplatform-stable/
34. 4. Key Points
35. Key Points 1. Use-case fi t w/ KPM & Compose 2. Decision process 3. Experimentation to avoid risk
36. Just, try it! “Frameworks are just tools”
37. Q & A