Kotlin Multiplatform — Shared Business Logic for Mobile

Overview

Kotlin Multiplatform (KMP) compiles one Kotlin codebase for Android, iOS, desktop (JVM) and web. Business logic, networking and the data layer live in a shared module; each platform keeps its own UI (or shares it too with Compose Multiplatform). Platform differences are isolated behind expect/actual declarations.

Instructions

Project Structure

Create the project with the Kotlin Multiplatform wizard in IntelliJ IDEA or Android Studio (New Project > Kotlin Multiplatform). Shared code and app entry points are separate modules: