Hi, Multiplatform community. I am Salathiel, an ex...

# multiplatform

[Salathiel Genese]

Hi, Multiplatform community. I am Salathiel, an experienced Dev, Ops but only 1w XP with Kotlin and 1d with Multiplatform.

I built a simple ToDo list to validate my understanding and am facing a few challenges:
• I built an Android APK using ./gradlew :composeApp:assembleRelease but the resulting APK couldn't be installed b/c it was invalid
• I built a Desktop (Linux) JAR using ./gradlew :composeApp:desktopJar but I couldn't launch the app using java -jar path/to/todo-app.jar (using javap to find which of the generated class files could be the main class, I ass MainKt to my java -jar command but to no avail)
• I was not able to find the documentation entry that addresses these build issues
• I was not able to find any online documentation that catalogs widgets available (maybe I needed some Android background first?! I dunno)
Thanks beforehand.

[ian.shaun.thomas]

assembleRelease will only work if you've setup a keystore which is entirely on the android plugin side, not kotlin. assembleDebug will create usable apks using a dev keystore

[Salathiel Genese]

Thank you Ian. I actually tried assembledDebug (the next best thing) and I had the same behaviour.

[Salathiel Genese]

Hi. It is me again, with updates...

I do not know which of these actions helped but one did (maybe not in this list). From Android Studio (Not IntelliJ Idea which I prefer):
• I installed Android SDK Build-tools 35, Android SDK Command-line Tools (latest), CMake, Android API Simulators, Android Emulator
• I installed API 34 (done priorly), API 34-ext8, API 34-ext12 (I have no idea what the two others are)
Then, from my terminal in project root, ./gradlew :composeApp:assembleDebug output a working debug APK.

For my Desktop build, I found one task that did it:
• ./gradlew packageReleaseUberJarForCurrentOs which gives me a uber JAR
• I'm well versed into Java so I went native from that Uber JAR using GraalVM native-image -jar /path/to/uber.jar and voila
On the UI widgets, I found some entries (although without visual illustrations):
• https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-android-only-components.html
• https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-desktop-components.html
• https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-swiftui-integration.html
• https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-uikit-integration.html
My next steps will be to publish the app on the Google Play Store (which has always to hardest and unsuccessful step for me 😭).

✌️