A hitchhiker's guide to Kotlin MultiPlatform

Where other technologies abstract away or completely replace platform-specific app development, Kotlin Multiplatform is complementary to existing platform-specific technologies and is geared towards replacing platform-agnostic business logic. It’s a new tool in the toolbox as opposed to replacing the toolbox, this talk would take you on a hitch-hiking journey across multiple platforms such as web , desktop and mobile apps all using KMP. We would pickup on where to get started , whats the future like and how to build faster with tips and tricks of the trade.

Transcript

1. A hitchhiker's guide to Kotlin MultiPlatform Accelerate your key learnings of modern Multiplatform app development with KMP Adit Lal GDE Android
2. Android GDE 🛠 Architect | Entrepreneur 🔊 Speaker 🌎 Globe Tro tt er 🍻 Beer enthusiast 🎯https:/ /androiddev.social/@aditlal 🔗aditlal.dev Adit GDE
3. Android GDE 🛠 Architect | Entrepreneur 🔊 Speaer 🌎 Globe Tro tt
4. Let’s Go https://app.sli.do/event/mJEpU8mPXKu8n6CDGzeZ35 or Goto slido.com Enter 1723179
5. a wild idea to build apps pops! develop for Android and iOS
6. a wild idea to build develop for An ‣ hire a team - Android and iOS ‣ de fi ne requirements ‣ plan roadmap for development ‣ develop and maintain and test apps ‣ production validation ‣ cross-check parity among both pla tf orms
7. native ~2x the team the cost time spent in meetings time spent on development time spent on testing time spent on bug fi xing a wild idea to build develop for An
8. a wild idea to build apps pops! develop for Android and iOS
9. a wild idea to build apps pops! develop for Android and iOS and web
10. native + web ~3x the team the cost time spent in meetings time spent on development time spent on testing time spent on bug fi xing a wild idea to build develop for An and web
12. how do we have the best of both worlds?
13. let’s fi nd a solution that works on all pla tf orms.
14. let’s fi nd a solution that works on all pla tf orms.
15. 2006 2008 2011 2012 2013 2015 2017 2018 . . . . . . . Multipla tf Cross pla tf
16. Multipla tf orm Cross pla tf orm A system where a program targeting multiple platforms utilises platform-speci fi c code alongside shared common code. This setup allows leveraging native functionalities on each platform while maintaining a uni fi ed codebase for shared logic and features. A cross-platform application is a system that enables the deployment of an application using identical application code across different platforms.
17. how do we have the best of both worlds?
18. how do we have the best of both worlds?
19. Coroutines Null-Safety Extension-Functions Smart-Casts Delegated-Properties Versatility on the Server Side streamlined approach Open Source Modern Language Features Uni fi ed Codebase
20. Kotlin K otlin multipla tf orm Using kotlin in projects to target more than one pla tf orm
21. Kotlin multipla tf orm “Shared UI is a history of pain and failure. Shared logic is the history of computers.” - Kevin Galligan
22. Kotlin multipla tf Source - https://shorturl.at/xyAPX
23. Kotlin multipla tf orm /kot · lin mul · ti · plat · form / / kät' lin malti' platfôrm, kät'lin melti'platfôrm/ noun optional, natively-integrated, open-source, code sharing pla tf orm, based on the popular, modern language kotlin. facilitates non-ui logic availability on many pla tf orms.
24. Kotlin multipla tf orm Google Workspace Still migrating the Google Docs, Slides, Sheets, Drive, and Meet. The existing apps have billions of downloads and Google is in the process of migrating from their in-house J2ObjC transpiler to KMP. Source - https://shorturl.at/xyAPX
25. Kotlin multipla tf orm Reuse skills Plug and play Control your decisions Performance Production-ready Productivity
26. Kotlin multipla tf orm
27. Kotlin multipla tf orm
28. Kotlin multipla tf orm
29. Kotlin multipla tf orm
30. Kotlin multipla tf orm but how can they expect to communicate?
31. Kotlin multipla tf orm but how can they expect to communicate? expect declared at common module actual declared at android module declared at iOS module declared at ...
32. Kotlin multipla tf orm Platform specif i c names?
33. Kotlin multipla tf orm Pla tf orm | common
34. Kotlin multipla tf orm commonMain src/commonMain/sample/Platform.kt expect object Platform { val name: String }
35. Kotlin multipla tf orm src/commonMain/sample/Platform.kt expect object Platform { val name: String }
36. Kotlin multipla tf orm src/commonMain/sample/Platform.kt expect object Platform { val name: String } targets: android and iOS or macOS de fi ne actual on android de fi ne actual on iOS de fi ne actual on macOS
37. Kotlin multipla tf orm src/androidMain/sample/Platform.kt actual object Platform { actual val name: String = "Android" } pla tf orm-dependent code
38. Kotlin multipla tf orm pla tf orm-dependent code actual object Platform { actual val name: String = “iOS" } src/iOSMain/sample/Platform.kt
39. Kotlin multipla tf orm src/androidMain/sample/Platform.kt actual object Platform { actual val name: String = "Android" } pla tf orm-dependent code actual object Platform { actual val name: String = “iOS" } src/iOSMain/sample/Platform.kt
40. Kotlin multipla tf orm pla tf orm-dependent code actual object Platform { actual val name: String = “macOS” } src/macosMain/sample/Platform.kt
41. Kotlin multipla tf orm Backend too !! import io.ktor.* fun main() { embeddedServer(Netty, 9090) { routing { get("/hello") { call.respondText("Hello, API!") } } }.start(wait = true) } src/jvmMain/kotlin/Server.kt
42. Kotlin multipla tf orm Common code import io.ktor.client.* import io.ktor.client.request.* import io.ktor.client.statement.* class ApiClient { private val client = HttpClient() suspend fun getHello() : String { return client.get("http: / / localhost:9090/hello").bodyAsText() } src/commonMain/kotlin/ApiClient.kt
43. Kotlin multipla tf orm pla tf orm-dependent code lifecycleScope.launch { val response = ApiClient().getHello() / / Update UI with response } src/androidMain/sample/Platform.kt
44. Kotlin multipla tf orm
45. Kotlin multipla tf orm Actual needs to match because obviously it does
46. Kotlin multipla tf orm
47. Kotlin multipla tf orm
48. Common Kotlin Kotlin/JS JS code Kotlin/JVM JVM code Kotlin/Native Native code Kotlin multipla tf orm
49. Kotlin multipla tf orm How much do we share Multipla tf orm What makes most sense
50. Kotlin multipla tf orm - strong community - a lot of people are using kotlin nowadays - Google and JetBrains are pushing Kotlin exclusively - you can ask questions directly at h tt ps://kotlinlang.slack.com conclusions
51. Kotlin multipla tf orm - 🛠 Tooling 📦 Storage 🏗 Architecture 🔑 Crypto 🗃 Serializer - code and tools - 🍎 Compose UI 🧮 Arithmetic - 📋 Log 📱 Device 🔍 Analytics 📁 File ⏰ Date-Time - 🎨 Graphics 🛢 Resources - 🌎 Network 💉 Dependency Injection 🩺 Test 🚀 Language extensions ➿ Asynchronous 🧩 Service SDK 🔧 Utils
52. Kotlin multipla tf orm - 2x faster to develop your features business logic - 2x faster writing unit tests - One tech stack - consistency achieved across pla tf orms conclusions
53. Kotlin multipla tf orm - sta rt small, don’t try to reach 100% of shared logic - be extremely careful with all updates - IDEA, JDK, kotlin, libraries - everything. - keep versioning in mind Suggestions
54. Kotlin multipla tf orm Kotlin Slack Kotlin O ffi cial Kotlin Training Kotlin by: - h tt ps://jakewha rt on.com/presentations/ - h tt p://antonioleiva.com/kotlin Resources Pay attention to this
55. Kotlin multipla tf orm h tt ps://github.com/joreilly/PeopleInSpace h tt ps://github.com/joreilly/ClimateTraceKMP h tt ps://github.com/halcyonmobile/Multipla tf ormPlayground About Kotlin Multipla tf orm project with Swi ft UI, Jetpack Compose, Wear Compose, Compose for Desktop, Compose for Web and Kotlin/JS + React clients along with Ktor backend. Resources
56. Thats all folks! https:/ /linktr.ee/aldefy