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Build a Multiplatform Future with Kotlin Márton Braun Developer Advocate

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iOS Android Desktop Web Server

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iOS Android Desktop Web Server

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Native Cross-platform VS

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Native Best user experience Cross-platform VS Great performance Full platform capabilities

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Native Reduced development time Consistent behavior Fewer bugs Best user experience Cross-platform VS Great performance Full platform capabilities

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Native Reduced development time Consistent behavior Fewer bugs Great performance Best user experience Cross-platform & Full platform capabilities

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kotl.in/kmp-case-studies

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Agenda History and target platforms How it works UI sharing Ecosystem Tooling

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2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Start of project 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Start of project 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/JVM .kt .class Java .java .class

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Public announcement Start of project Open source 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/JVM .kt .class Java .java .class

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Public announcement Start of project Open source 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/JVM .kt .class Kotlin 1.0

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Kotlin 1.0 Public announcement Start of project Open source JavaScript 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/JVM .kt .class Kotlin/JS .kt .js

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/Native .kt .klib|.kexe

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/Native .kt .so|.dll|.exe|.kexe|.etc

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/Native .kt .klib|.kexe

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025 Kotlin/JVM .kt .class Kotlin/Native .kt .klib|.kexe Kotlin/JS .kt .js

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP alpha 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm Kotlin/JVM .kt Kotlin/Native .kt Kotlin/JS .kt Kotlin/Wasm .kt .class .klib|.kexe .js .wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin/JVM .kt Kotlin/Native .kt Kotlin/JS .kt Kotlin/Wasm .kt .class .klib|.kexe .js .wasm

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.class .klib|.kexe .js .wasm .kt .kt .kt .kt Kotlin/JVM Kotlin/Native Kotlin/JS Kotlin/Wasm

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.kt .class .klib|.kexe .js .wasm .kt .kt .kt

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.kt .class .klib|.kexe .js .wasm K2 frontend

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.kt K2 frontend JVM backend Native backend JS backend Wasm backend .class .klib|.kexe .js .wasm

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.kt K2 frontend JVM backend Native backend JS backend Wasm backend .class .klib|.kexe .js .wasm

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Java + Kotlin Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin first Java + Kotlin Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Kotlin first, Jetpack Compose Java + Kotlin Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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Jetpack KMP Kotlin first, Jetpack Compose Java + Kotlin Kotlin 1.0 Public announcement Start of project Open source Native JavaScript KMP stable Wasm KMP alpha KMP beta 2013 2014 2015 2016 2017 2018 2019 2020 2021 2012 2022 2010 2011 2023 2024 2025

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How it works

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iOS Android Desktop +

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Desktop + Android iOS .kt .kt .class .framework

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iOS .class .framework Desktop + Android .kt .kt

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Common .kt .kt

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.kt .kt .kt .kt Android Desktop iOS Common

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.kt .kt .kt .kt Android Desktop iOS Common

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.kt .kt .kt .kt Android Desktop iOS Common

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.kt .kt .kt Android Desktop iOS Common .kt

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.kt .kt .kt .kt Android Desktop iOS Common

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.kt .kt .kt .kt Android Desktop iOS Common

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.kt .kt .kt Android Desktop iOS Common class Person(val name: String, var age: Int) fun greet(person: Person) { println("Hello, ${person.name}") }

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.kt .kt .kt Android Desktop iOS Common fun List.duplicates(): Map { return map { it.name.substringBefore(" ") } .groupingBy { it } .eachCount() .filter { (name, count) -> count > 1 } }

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Android Desktop iOS actual Common expect actual actual

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Android Desktop iOS Common expect actual actual actual

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Android Desktop iOS Common fun getPlatform(): String expect actual actual actual

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Android Desktop iOS Common fun getPlatform(): String fun getPlatform(): String = "Java ${System.getProperty("java.version")}" expect actual actual actual

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Android iOS fun getPlatform(): String = "Android ${Build.VERSION.SDK_INT}" actual actual Common fun getPlatform(): String expect Desktop fun getPlatform(): String = "Java ${System.getProperty("java.version")}" actual

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Android iOS fun getPlatform(): String = "iOS ${UIDevice.currentDevice.systemVersion}" fun getPlatform(): String = "Android ${Build.VERSION.SDK_INT}" actual actual Common fun getPlatform(): String expect Desktop fun getPlatform(): String = "Java ${System.getProperty("java.version")}" actual

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Android Desktop iOS Common fun getPlatform(): String fun getPlatform(): String = "Java ${System.getProperty("java.version")}" fun getPlatform(): String = "iOS ${UIDevice.currentDevice.systemVersion}" fun getPlatform(): String = "Android ${Build.VERSION.SDK_INT}" expect actual actual actual

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Multiplatform libraries

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.kt .kt .kt Android Desktop iOS Common import io.ktor.client.* suspend fun loadHtml(): String { val client = HttpClient() val response = client.get("https://kotlinlang.org") return response.body() }

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Shared logic

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Shared logic Swing Desktop logic Jetpack Compose Android logic SwiftUI iOS logic

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Shared logic Swing Desktop logic Jetpack Compose Android logic SwiftUI iOS logic

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Shared logic Swing Desktop logic Jetpack Compose Android logic SwiftUI iOS logic

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Shared logic Swing Desktop logic Jetpack Compose Android logic SwiftUI iOS logic

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jb.gg/compose Compose Multiplatform

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Compose Multiplatform jb.gg/compose

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@Composable fun SquaresGalleryView( images: List, selectedImage: PictureData, onSelect: (PictureData) -> Unit, ) { LazyVerticalGrid( modifier = Modifier.padding(top = 4.dp), columns = GridCells.Adaptive(minSize = 130.dp), verticalArrangement = Arrangement.spacedBy(1.dp), horizontalArrangement = Arrangement.spacedBy(1.dp) ) { itemsIndexed(images) { _, picture -> SquareThumbnail( picture = picture, onClick = { onSelect(picture) }, isHighlighted = selectedImage === picture ) } } }

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@Composable fun SquaresGalleryView( images: List, selectedImage: PictureData, onSelect: (PictureData) -> Unit, ) { LazyVerticalGrid( modifier = Modifier.padding(top = 4.dp), columns = GridCells.Adaptive(minSize = 130.dp), verticalArrangement = Arrangement.spacedBy(1.dp), horizontalArrangement = Arrangement.spacedBy(1.dp) ) { itemsIndexed(images) { _, picture -> SquareThumbnail( picture = picture, onClick = { onSelect(picture) }, isHighlighted = selectedImage === picture ) } } }

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Swing Desktop logic Jetpack Compose Android logic SwiftUI iOS logic Shared logic

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Desktop logic Android logic iOS logic Shared logic Shared UI Compose Multiplatform

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Desktop logic Android logic iOS logic Shared logic Shared UI Compose Multiplatform Swing Android Views SwiftUI

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Desktop logic Android logic iOS logic Shared logic Shared UI Compose Multiplatform Swing Android Views SwiftUI

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Mix and match UI Compose view embedded in SwiftUI Floating SwiftUI TextField

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Latest developments Resources 1.6.0+ Lifecycle Navigation 2.8.0-rc03 2.7.0-alpha07 ViewModel 2.8.0-rc03

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ViewModel org.jetbrains.androidx.lifecycle:lifecycle-viewmodel-compose package androidx.lifecycle public abstract class ViewModel { protected open fun onCleared() public fun addCloseable(key: String, closeable: AutoCloseable) public open fun addCloseable(closeable: AutoCloseable) } public val ViewModel.viewModelScope: CoroutineScope

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Navigation org.jetbrains.androidx.navigation:navigation-compose val navController: NavHostController = rememberNavController() NavHost( navController, startDestination = "list" ) { composable("list") { ListScreen(navController) } composable("detail/{objectId}") { backStackEntry -> val objectId = backStackEntry.arguments?.getString("objectId")?.toInt() DetailScreen(navController, objectId!!) } }

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Multiplatform libraries

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Networking

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Data storage

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Key-value stores

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Dependency injection

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Navigation

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Image loading

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Themes

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github.com/terrakok/kmp-awesome

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Tooling

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Public Preview

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Kotlin Multiplatform JetBrains tooling Flexible code sharing Best of native + cross-platform Stable and production-ready

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jb.gg/kmp-samples Official sample apps

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kmp.jetbrains.com

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kmp.jetbrains.com

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Kotlin Multiplatform jb.gg/kmp Compose Multiplatform jb.gg/compose Fleet jb.gg/fleet Build a Multiplatform Future with Kotlin zsmb.co/talks Márton Braun @zsmb13@androiddev.social