Hey everyone, I am still quite new to both Kotlin ...

# multiplatform

[Mychael Koelfat]

Hey everyone,
I am still quite new to both Kotlin and KMM, so this may be really obvious, I apologize.
I'm just starting to translate some code to KMM to share it between both Android and IOS. Currently I'm working in Android Studio on a Windows device.
I created this class:

class SharedDiscover {
    companion object {
        fun parse(deviceId: Int, data: ByteArray, buffer: ByteBuffer): Boolean  {
            // Some code...
        }
    }
}

However, it has an unsolved reference to ByteBuffer. This links back to import java.nio.ByteBuffer in the existing project, but in the shared folder I obviously cannot link to this, or at least not in this way. Does anyone have a workaround? Or any insight on how this works?

[jessel]

You’ll want a cross platform solution, and the de facto standard for that for KMP is https://square.github.io/okio/

[jessel]

I believe its Buffer implementation should work approximately the same and is available on all kotlin targets

[jessel]

(I’ve not touched Native much though so someone may correct me)

[Mychael Koelfat]

Okay thanks for your help!

[Kevin S]

The reason this happens is that the common kotlin has no reference to Java or JVM. You can use java classes in androidMain, but not in any other source set. So one approach would be to use the expect/ actual functionality. Then you can expect a Buffer class, and then on the androidMain side you can use the actual ByteBuffer since Android uses JVM. Then on the iOS side you would use NSData or the swift alternative. You should be fine with Okio but that’s generally how KMM works.