Kotlin Multiplatform (in the KotlinConf 2026 Keynote)

Transcript

1. Márton Braun Developer Advocate, JetBrains
3. AppFigures data, March 2025 to March 2026 2xTop 10k mobile apps using KMP
4. AppFigures data, March 2025 to March 2026 2xTop 10k mobile apps using KMP
5. Built with Compose Multiplatform
6. Sony | Sound Connect
7. Sony | Sound Connect Perk
8. Sony | Sound Connect Perk Alipay
9. Sony | Sound Connect Kuaishou Perk Alipay
10. Sony | Sound Connect Tencent Video Kuaishou Perk Alipay
11. Serving hundreds of millions of users. Every day.
12. IDE Plugin Android Studio Intell" IDEA
13. IDE Plugin Android Studio Intell" IDEA Run configurations
14. IDE Plugin Android Studio Intell" IDEA Compose editing Run configurations
15. IDE Plugin Android Studio Intell" IDEA Compose editing Run configurations Swift features
16. IDE Plugin Android Studio Intell" IDEA AGP 9.0 support Compose editing Swift features Run configurations
17. New default structure
18. New default structure shared androidApp iosApp desktopApp webApp
19. New default structure shared androidApp iosApp desktopApp webApp !!# !!#
20. iOS
21. iOS Kotlin
22. Swift Export Data classes Nested classes Sealed classes Interfaces Top-level functions Companion objects Exceptions Enums Collection types Primitive types Type aliases Lambdas with receivers Extension functions Function overloads Multiple modules Packages
23. Swift Export Data classes Nested classes Sealed classes Interfaces Top-level functions Companion objects Exceptions Enums Collection types Primitive types Type aliases Lambdas with receivers Extension functions Function overloads Multiple modules Packages Value classes varargs Inline functions Suspending functions Flows Functional types Context parameters Exhaustive enums New
24. Swift Export suspend fun loadUsers(): List<User> val users: Flow<User> Suspending functions Flows
25. Swift Export suspend fun loadUsers(): List<User> try await loadUsers() val users: Flow<User> Suspending functions Flows
26. Swift Export suspend fun loadUsers(): List<User> try await loadUsers() val users: Flow<User> for try await user in users.asAsyncSequence() { print(user.name) } Suspending functions Flows
27. Swift Export
28. Swift Export Alpha
29. SPM import Alpha kotlin { swiftPMDependencies { swiftPackage(url("https:!"github.com/googlemaps/ios-maps-sdk.git")) } } build.gradle.kts
30. SPM import Alpha kotlin { swiftPMDependencies { swiftPackage(url("https:!"github.com/googlemaps/ios-maps-sdk.git")) } } import swiftPMImport.demo.google.maps.GMSCameraPosition import swiftPMImport.demo.google.maps.GMSMapView val camera = GMSCameraPosition.cameraWithLatitude(48.13677, 11.69221, 6.0f) mapView = GMSMapView.mapWithFrame(frame, camera) Map.ios.kt build.gradle.kts
31. Kotlin/Native performance from Kotlin 2.2 to 2.4
32. Kotlin/Native performance 25% less build time Google Docs, linkRelease task from Kotlin 2.2 to 2.4
33. Kotlin/Native performance 25% less build time 58%less build RAM usage Google Docs, linkRelease task from Kotlin 2.2 to 2.4
35. Web Desktop iOS Android Compose Multiplatform Stable Alpha Stable Stable
36. Web Desktop iOS Android Compose Multiplatform Stable Alpha Beta Stable Stable
37. The latest improvements and APIs Window inset rulers keepScreenOn Modifier Retain API Improved shared element transitions Veiled transitions v2 testing APIs Style API Flexbox layout Grid layout mediaQuery API New SlotTable implementation Navigation 3 Unified @Preview annotation Shadow modifiers Visibility change modifier Material 3 Expressive 2D Scroll APIs
38. The latest improvements and APIs Window inset rulers keepScreenOn Modifier Retain API Improved shared element transitions Veiled transitions v2 testing APIs Style API Flexbox layout Grid layout mediaQuery API New SlotTable implementation Navigation 3 Unified @Preview annotation Shadow modifiers Visibility change modifier Material 3 Expressive 2D Scroll APIs Navigation 3
39. The latest improvements and APIs Window inset rulers keepScreenOn Modifier Retain API Improved shared element transitions Veiled transitions v2 testing APIs Style API Flexbox layout Grid layout mediaQuery API New SlotTable implementation Navigation 3 Unified @Preview annotation Shadow modifiers Visibility change modifier Material 3 Expressive 2D Scroll APIs Navigation 3 Navigation 3 Stable
40. Compose Multiplatform for iOS
41. Compose Multiplatform for iOS
42. Compose Multiplatform for iOS UIKitView( factory = { UIButton() }, properties = UIKitInteropProperties( placedAsOverlay = true ) )
43. Compose Multiplatform for iOS
44. Compose Multiplatform for iOS 20% faster rendering in complex layouts Parallel rendering Up to
45. Compose Multiplatform for Desktop
46. Compose Multiplatform for Desktop
47. Compose Multiplatform for Web Beta
48. Compose Multiplatform for Web Beta HtmlElementView( factory = { document.createElement("iframe").apply { setAttribute("src", embedUrl) style.cssText = "width:100%;height:100%" } }, )
49. Compose Multiplatform for Web Beta HtmlElementView( factory = { document.createElement("iframe").apply { setAttribute("src", embedUrl) style.cssText = "width:100%;height:100%" } }, )
50. JavaScript Kotlin TypeScript
51. JavaScript Kotlin TypeScript
52. JavaScript Kotlin Build an SDK Build an app TypeScript
53. Kotlin/JS Suspend functions Type variance support Unified companion syntax Value classes Implementable interfaces Statics LongArray as BigInt64Array Default exports Tuples Nested classes New features
54. Kotlin/JS @JsExport suspend fun fetchUser(): User User.kt Suspend functions
55. Kotlin/JS export declare function fetchUser(): Promise<User>; module.d.ts @JsExport suspend fun fetchUser(): User User.kt Suspend functions
56. Kotlin/JS import { App.tsx export declare function fetchUser(): Promise<User>; module.d.ts @JsExport suspend fun fetchUser(): User User.kt fe } from 'shared'; f (shared) Promise<User> fetchUser() To uncover the secrets of Kodee, you just have t… Next Tip Suspend functions
57. import { fetchUser } from 'shared'; export declare function fetchUser(): Promise<User>; @JsExport suspend fun fetchUser(): User Kotlin/JS Suspend functions App.tsx module.d.ts User.kt
58. import { fetchUser } from 'shared'; export declare function fetchUser(): Promise<User>; @JsExport suspend fun fetchUser(): User let user = await fetchUser(); console.log(user.name); Kotlin/JS Suspend functions App.tsx module.d.ts User.kt
59. import { getUser } from 'shared'; let user = await fetchUser(); console.log(user.name); App.tsx export declare function fetchUser(): Promise<User>; module.d.ts @JsExport suspend fun fetchUser(): User User.kt Kotlin/JS Suspend functions
61. Ecosystem Libraries indexed by klibs.io 2022 2023 2024 2025 2026 0 1000 2000 3000 4000
62. 2022 2023 2024 2025 2026 Thank you! 0 1000 2000 3000 4000