Kotlin Multiplatform Development

Course details

Master cross-platform development with Kotlin by creating sophisticated applications that run seamlessly across Android, iOS, web, and desktop. In this comprehensive course, instructor Colin Lee empowers you to make smart architectural choices between Compose Multiplatform's shared UI approach and platform-specific interfaces like SwiftUI, balancing code reuse with native feel. Learn how to create shared networking layers with Ktor and implement cross-platform data persistence using SQLDelight. Whether you're a mobile developer looking to expand your reach or a full-stack engineer seeking to unify your codebase, this course equips you with the essential skills you need to develop professional Kotlin applications that truly write once and run from anywhere.

Learning objectives
Assemble a Kotlin application that can execute across Android, iOS, web, macOS, Windows, and Linux.
Correctly choose between building your Kotlin app using either Compose Multiplatform with shared Compose user interfaces or using Kotlin Multiplatform with native user interface libraries, such as Jetpack Compose and SwiftUI.
Create shared networking code in Kotlin across multiple platforms using a REST library such as Ktor.
Share database code in Kotlin across multiple platforms using a library such as SQLDelight.

Concepts

Introduction

Kotlin multiplatform development
What you should know

Creating Our First Multiplatform App

The problem Kotlin Multiplatform solves
Comparison with alternatives
Supported platforms and performance
Just what the KDoctor ordered
Android studio for KMP
Xcode for KMP
Crafting a template with the Kotlin Multiplatform wizard

Combining Native with Multiplatform

Building our first multiplatform app
Whether to use Compose Multiplatform
Expect and actual
An actual example
Accessing operating system methods
Multiplatform project structure

KMP and Swift

Using Kotlin from Swift code
Making it easier with Swift export
KMP together with SwiftUI

Architecture

Recommended architecture with MVVM
Google ViewModel

Sharing Network

Adding Ktor to your project
Modeling with Kotlinx-serialization
Making network requests
Apollo GraphQL

Sharing Database

Adding SQLDelight to your project
Setting up your database and adding objects
Creating queries
Going with the flow

Quality of Life

Kermit for logging
Managing resources
KOIN for dependency injection
Storing values in multiplatform-settings
Dates in Kotlinx-datetime

Conclusion

Next steps