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PeopleInSpace

Minimal Kotlin Multiplatform project with SwiftUI, Jetpack Compose, Compose for Wear OS, Compose for Desktop, Compose for Web, and Kotlin/JS + React clients along with Ktor backend. Currently running on

It makes use of Open Notify PeopleInSpace API to show list of people currently in space and also the position of the International Space Station (inspired by https://kousenit.org/2019/12/19/a-few-astronomical-examples-in-kotlin/)!

The project is included as sample in the official Kotlin Multiplatform Mobile docs and also the Google Dev Library

Related posts:

Note that this repository very much errs on the side of minimalism to help more clearly illustrate key moving parts of a Kotlin Multiplatform project and also to hopefully help someone just starting to explore KMP to get up and running for first time (and is of course primarily focused on use of Jetpack Compose and SwiftUI). If you're at the stage of moving beyond this then I'd definitely recommend checking out KaMPKit from Touchlab. I also have the following samples that demonstrate the use of a variety of Kotlin Multiplatform libraries (and also use Jetpack Compose and SwiftUI).

Building

You need to use Android Studio Arctic Fox (note: Java 11 is now the minimum version required). Requires XCode 13.2 or later (due to use of new Swift 5.5 concurrnecy APIs).

When opening iOS/watchOS/macOS projects remember to open .xcworkspace file (and not .xcodeproj one).

To exercise (React based) web client run ./gradlew :web:browserDevelopmentRun.

To run backend you can either run ./gradlew :backend:run or run Server.kt directly from Android Studio. After doing that you should then for example be able to open http://localhost:9090/astros_local.json in a browser.

Compose for Web client

The Compose for Web client resides in the compose-web module and can be run by invoking ./gradlew :compose-web:jsBrowserDevelopmentRun

Compose for Desktop client

This client is available in compose-desktop module. Note that you need to use appropriate version of JVM when running (works for example with Java 11)

Backend code

Have tested this out in Google App Engine deployment. Using shadowJar plugin to create an "uber" jar and then deploying it as shown below. Should be possible to deploy this jar to other services as well.

./gradlew :backend:shadowJar
gcloud app deploy backend/build/libs/backend-all.jar 

GraphQL backend

There's a GraphQL module (graphql-server) which can be run locally using ./gradlew :graphql-server:bootRun with "playground" then available at http://localhost:8080/playground

Screenshots

iOS (SwiftUI)
Screenshot 2021-02-27 at 12 09 02

Android (Jetpack Compose)
Screenshot 2021-03-07 at 17 03 46

watchOS (SwiftUI)
watchOS Screenshot 1 watch0S Screenshot 2

Wear OS (Wear Compose)
Wear Compose Screenshot 1 Wear Compose Screenshot 2 Wear Compose Screenshot 3

macOS (SwiftUI)
Screenshot 2021-06-01 at 20 02 31

Compose for Desktop
Screenshot 2021-10-01 at 16 45 06

Compose for Web
Screenshot 2021-05-31 at 21 29 53

Web App (Kotlin/JS + React)
Screenshot 2021-06-06 at 23 50 00

Languages, libraries and tools used