How can I add a special extension to a class only ...

# multiplatform

[Cristián Arenas]

How can I add a special extension to a class only for Android?

In iOS, this worked:

fun MyType.newMethod(x: NSSomething) {}

I could call it from iOS with the appropriate type.
But if I add the equivalent in Android, it isn’t callable.

[Kris Wong]

that sounds odd. i've added symbols to my android target and not had any issues calling them from an app

[Kris Wong]

not this case specifically, though

[kpgalligan]

If the goal is adding it so you can call it from common, then you need to do an expect/actual for the extension, which you can do. Expects in each platform on their own should work, though.

[kpgalligan]

Also, as a maybe problem, I’ve seen naming issues in the jvm. So, if the file is MyType.kt on all 3 platforms, you may have an issue there, but I forget the exact trigger sequence

[Cristián Arenas]

@Kris Wong how did you add something to only the android target then?

[Kris Wong]

i right clicked on the source folder and selected new Kotlin class 😛

[Cristián Arenas]

oh, so a new type, not an extension to an already existing one

[Kris Wong]

correct

[Cristián Arenas]

It’s interesting that it did work on iOS, so I guess this is a bug

[Cristián Arenas]

@kpgalligan the idea is not to have a common API to call from commonMain, but rather, to expose different APIs to iOS and Android code

[kpgalligan]

I’d be pretty surprised if you couldn’t add extension functions on Android. If you’ve got a very small repro in a repo I’d take a look.

[Cristián Arenas]

Damn, it’s really hard to make a new repo 😅

[Cristián Arenas]

I had forgotten how long it took us to get the environment “right”

[Kris Wong]

if you only need a JVM target and not android specifically, the new project wizard does a pretty good job for me