Hi guys, if I compile with jvm target 8 or use java 8 dependencies for my JVM artifact in a multipla...

# multiplatform

[Joffrey]

Hi guys, if I compile with jvm target 8 or use java 8 dependencies for my JVM artifact in a multiplatform project, is it usable anyway from Android? Do I need to add an android-specific target?

[magnumrocha]

this is more a question for android channel, because it is about the support of java 8 features by the android, I recommend you read https://developer.android.com/studio/write/java8-support

[magnumrocha]

just to explain, in your case, the kmp module will produce a lib (java 8 support), so you question is: my android app will support this (java 8 compatible) lib?

[magnumrocha]

in the link above, take a look at this table:
https://developer.android.com/studio/write/java8-support#supported_features

[Joffrey]

Sorry if this question does not belong here. The slack channels have quite a bit of overlap and I find it difficult to find the right place (as opposed to tags on stackoverflow). I had already checked the page you linked, but it seemed to me that this was about Java 8 features supported in the Android project itself, through desugaring done by the build tool. Apparently, it also applies transformations on the dependencies, so I was wrong and it might help me in the end. However, I have no way of knowing whether my own dependencies make use of some Java 8 specific APIs that are not in the whitelist of this page 😞 Is there a way to check in my own gradle build that I’m compliant with the android toolchain? Is that a question for the gradle channel?

[magnumrocha]

no problem about your question, my intention is just to lead you to the right place for the next question 🙂, so, thinking in your use case, if some API of your library is not compliant with the Android Java 8 support, the compiler of Android toolchain will alert, and possibly will fail too.

[Joffrey]

That’s the thing, I am not using any android-specific toolchain at the moment in my MPP lib, just plain jvm and js targets. So I guess for now, it will only fail in the user’s android project (if it fails at all). I would like to find a way to configure my own MPP lib’s build so that it fails if I’m using android-incompatible dependencies or APIs. Do I need to add an android target and an android-lib plugin for this purpose?

[magnumrocha]

so, you can configure an android target on it, and make this target depends of your jvm target

[magnumrocha]

don't need to create the android source folder, just configure the target in kmp plugin and make the dependency...

[magnumrocha]

so, the compilation of your kmp lib will fails if it's not compliant of android

[Joffrey]

I see, thanks a lot for taking the time to answer. Do you know if there’s any existing example out there using this approach?

[magnumrocha]

I don't know, but let test it, who knows your project is the first one 😁

[Joffrey]

I’ll share my project if I manage to make this work

[Joffrey]

I have seen this example, but they’re using a plain jvm target preset for the shared module’s android target