Kotlin Multiplatform

Transcript

1. Kotlin Multiplatform 集まれもうやんカレーとKotlin好き！Kotlin愛好会 vol6
2. About Me • Matthew Vern / Panini • Twitter: @callipan Github: panpanini • Mercari, Inc • Android Engineer (US) • Kotlin可愛い
3. Summary • I made a Kotlin Multiplatform project！ • It has an Android and iOS app both backed by a common library
4. Kotlin Multiplatform
5. Kotlin Multiplatform • https://speakerdeck.com/panini/kotlin-multi-platform • This time I will actually talk about Kotlin Multiplatform
6. Kotlin Multiplatform • https://kotlinlang.org/docs/reference/multiplatform.html • 1 codebase, multiple platforms ◦ Android ◦ iOS ◦ JS ◦ (JVM)
7. Kotlin Multiplatform - requirements • Multiplatform code must be 100% pure Kotlin • Platform specific code must be referenced using `expect` and `actual`
8. Kotlin Multiplatform - tutorial • https://kotlinlang.org/docs/tutorials/native/mpp-ios-android.html • Explains how to use `expect` and `actual` mechanism expect fun platformName(): String fun createApplicationScreenMessage() : String { return "Kotlin Rocks on ${platformName()}" }
9. :thinking:
10. Kotlin Multiplatform - tutorial v2.0 • I want a realistic sample project, that reflects real world usage • It should perform network operations • UI should be managed by each platform, so only logic should be shared
11. Lets build!
12. Lets build! • I wrote some details in this blog, please check it! • https://tech.mercari.com/entry/2018/12/18/114010 • I want to build this architecture
13. Lets build! • First, lets build http client • Because I’m normally an Android Engineer, lets use Retrofit • https://square.github.io/retrofit/ • It lets us make network calls just by creating an interface
15. Kotlin Multiplatform - requirements • Multiplatform code must be 100% pure Kotlin • Platform specific code must be referenced using `expect` and `actual`
19. Ktor • https://ktor.io • Kotlin http server • Kotlin http client
20. Ktor • https://ktor.io • Kotlin http server • Kotlin http client • Multiplatform support
21. Lets build!!!!
22. Service.kt
23. ViewModel.kt
24. Observable.kt
25. Lets build iOS!!!!
26. Observable.kt
27. Observable.kt
28. Lets open Xcode!!!!
29. Xcode………..
30. SplatMaps.xcproject
31. ViewController.swift
33. Lets build Android!!!!
34. SplatoonCoroutine.idea
35. MatchFragment.kt
37. Summary • I made a Kotlin Multiplatform project！ • It has an Android and iOS app both backed by a common library • Http client is not as easy to use as Retrofit • return KotlinUnit() is ダサイ... • Kotlin works anywhere and that makes it 可愛い • https://github.com/panpanini/SplatMaps-Multiplatform
38. Have a nice Kotlin!