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Creating SDKs with Kotlin Multiplatform Rivu Chakraborty 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social https://courses.rivu.dev/

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● India’s first GDE (Google Developer Expert) for ● More than 11 years in the Industry ● Mobile Architect @ JioCinema ● Previously ○ Byju’s ○ Paytm ○ Gojek ○ Meesho ● Author (wrote multiple Kotlin books) ● Speaker ● Mentor ● Community Person ● YouTuber (?) 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Who am I? 󰞦

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What’s an SDK?

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social What’s an SDK? 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Software Development Kit. Library/SDK

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social What’s an SDK? 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Software Development Kit. Library/SDK

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social What’s an SDK? 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social A code block, that helps your or client apps reduce redundancy, by using this library / SDK

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Most Common SDK Use Cases 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Analytics ● Chat / Conversation ● Ads ● Image Processing ● Audio-Video Processing

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Rules for Developing SDK

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SDK Rules 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SDK Rules 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SDK Rules 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SDK Rules 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SDK Rules 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client 4. Data Types should be interoperable

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SDK Rules 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client 4. Data Types should be interoperable 5. [Optional] Should allow client apps to implement own UI

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Building an SDK

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms Android 1x

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms Android, iOS 2x

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms Android, iOS, Web 3x

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms Android, iOS, Web, tvOS ~4x

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms Android, iOS, Web, tvOS, Tizen & WebOS [HTML5 TV] ~5x

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Building an SDK 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Hire / Allocate Developers ● Define Requirements ● Plan Roadmap ● Develop, maintain and test SDK integration ● Cross Check Parity / Consistency across platforms ● Setup SDK release ● Maintain versioning across platforms Android, iOS, Web, tvOS, Tizen & WebOS [HTML5 TV], WatchOS, WearOS ~7x

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Solution? 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Share Code across all Platforms

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Solution? 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Share Code across all Platforms

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Share Code across all Platforms 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social

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Current Solutions for Sharing Code across Platforms

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Flutter 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social React Native Kotlin Multiplatform C/C++

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Flutter 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client 4. Data Types should be interoperable 5. [Optional] Should allow client apps to implement own UI

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social React Native 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client 4. Data Types should be interoperable 5. [Optional] Should allow client apps to implement own UI

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client 4. Data Types should be interoperable 5. [Optional] Should allow client apps to implement own UI ✓ C/C++

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Too Complicated to work with. Unless necessary. C/C++

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Kotlin Multiplatform 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 0. Should be Plug and Play 1. Should be easy to remove 2. Should not add unnecessary extra dependencies to the client app 3. Interaction should be straightforward for the client 4. Data Types should be interoperable 5. [Optional] Should allow client apps to implement own UI ✓

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Why Kotlin Multiplatform [KMP/KMM]

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Developed by Jetbrains ● Open Source ● Supported by Google for Android Development ● Supported by Spring for Server ● Has own framework (Ktor) for asynchronous client and server applications ● Has different targets for Different platforms. e.g. Kotlin/JVM, Kotlin/Native, Kotlin/JS, Kotlin/Wasm etc.

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Kotlin Multiplatform

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Kotlin Multiplatform 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Using Kotlin Code in projects to target more than one platform

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Kotlin Multiplatform 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social ● Idiomatic Kotlin Language for all platforms ● Low Risk ○ You decide what to share, what not ○ Option to use existing 3rd party libraries for each platform ● Interoperability ● Consistency across platforms ● Export platform native SDK builds ● Strong Community Support

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Current users of KMP 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social

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Understanding Kotlin Multiplatform [KMP/KMM]

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social The Structure 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social The Structure 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Common JVM JS Native Android Server Apple Linux mingw iOS tvOS watchOS macOS linux_x64 linux_arm64 mingx64 iosX64 iosArm64 iosSimulatorArm64 tvosX64 tvosArm64 tvosSimulatorArm64 macosX64 macosArm64 watchosX64 watchosArm32 watchosArm64 watchosSimulatorArm64 watchosDeviceArm64

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social The Structure expect fun doSomething() actual fun doSomething() { //Platform specific logic here }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social The Structure Directory Structure

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Expect/Actual expect fun getRandomUUID(): String commonMain

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Expect/Actual androidMain actual fun getRandomUUID(): String = UUID.randomUUID().toString()

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Expect/Actual iosMain actual fun getRandomUUID(): String = NSUUID().UUIDString()

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Expect/Actual jsMain import uuid actual fun getRandomUUID(): String = uuid.v4().toString()

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Dependency Management val commonMain by getting { dependencies { implementation(libs.bundles.common.ktor) implementation(libs.coroutines.core) implementation(libs.kotlinx.datetime) implementation(libs.koin.core) implementation(libs.skie) } }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Dependency Management val jsMain by getting { dependencies { implementation(npm("uuid", "9.0.0")) implementation(libs.wire.runtime.js) } }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Dependency Management val androidMain by getting { dependencies { implementation(libs.ktor.client.okHttp) implementation(libs.okhttp.loggingInterce ptor) implementation(libs.koin.android) implementation(libs.sqlDelight.android) } }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social val iosMain by getting { dependencies { implementation(libs.ktor.client.darwin) implementation(libs.sqlDelight.native) } } Dependency Management

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Shared Common Code class EventsRepository( private val eventsRemoteDS: EventsRemoteDS, private val eventsLocalDS: EventsLocalDS, ) { suspend fun trackEvent( eventData: EventData, eventName: String, ) { //Logic to track Events ... } }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Exported SDK files Android .aar iOS .xcframework JS Minified js / NPM

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Setting up iOS Distribution XCFramework val xcFramework = XCFramework("IndiaConferences") listOf( iosX64(), iosArm64(), iosSimulatorArm64(), ).forEach { it.binaries.framework { xcFramework.add(this) baseName = SDKConfig.sdkName } }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social SPM kmmbridge { spm() mavenPublishArtifacts() versionPrefix.set(SDKConfig.version) frameworkName.set(SDKConfig.sdkName) } https://kmmbridge.touchlab.co Setting up iOS Distribution

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Taking care of Interoperability https://skie.touchlab.co/ data class User @DefaultArgumentInterop.Enabled constructor( val id: String, val firstName: String, val lastName: String, val userType: UserType = UserType.User ) @EnumInterop.Enabled enum class UserType { User, Admin, }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social https://skie.touchlab.co/ data class User @DefaultArgumentInterop.Enabled constructor( val id: String, val firstName: String, val lastName: String, val userType: UserType = UserType.User ) @EnumInterop.Enabled enum class UserType { User, Admin, } @JsExport object UserTypeJS { val User = UserType.User val Admin = UserType.Admin } Taking care of Interoperability

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Versioning object LibraryConfig { val version = "1.0.0" const val groupId = "dev.rivu.kmp.sdkDemo" const val artifactIdSdk = "core" val sdkName = "demo-sdk" }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Reducing Size in JS js { browser { dceTask { keep("shared.dev.rivu.MyClass") } binaries.executable() } }

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Using the bundle in JS

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social Using the XCFramework in iOS

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IDEs and Tools

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🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social IDEs and Tools

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Resources ● https://speakerdeck.com/aldefy/a-hitchhikers-guide-to-kotlin-multiplatform ● https://github.com/joreilly/PeopleInSpace ● https://github.com/joreilly/Confetti ● https://kotlinlang.org/docs/multiplatform.html ● https://courses.rivu.dev ● https://leanpub.com/thecomposebook

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Thank You Rivu Chakraborty 🌐https://www.rivu.dev/ youtube.com/@rivutalks @rivuchakraborty @rivu@androiddev.social https://courses.rivu.dev/