Hey guys, I have a Kotlin class with some reified ...

# android

[Schadenfreude]

Hey guys, I have a Kotlin class with some reified and equivalent normal functions:

// Java fun
fun <T:E> registerEvent(cls:Class<T>, consumer: Consumer<T>) : Disposable {
        return this.listen(cls)
            .subscribe(consumer)
    }

// Kotlin fun (calls the java one)
inline fun <reified T:E> registerEvent(consumer: Consumer<T>): Disposable {
        return registerEvent(T::class.java, consumer)
    }

In java I have no problem calling registerEvernt(SomeClass.class, this::consumerMethod), but in Kotlin, when I try to do a method reference for the consumer, the compiler gives me an error and says it returns a KFunction1<SomeClass, Unit> and the required parameter is Consumer<SomeClass>. Is there any way I can make the functions behave the same, or is the inline or something else making it impossible?

[skoric]

It’s the SAM conversion problem. When you pass a function in Kotlin, it can’t be passed like that to Java, but it’s wrapped to KFunction1<>

[skoric]

You have resources online on this topic, e.g. https://medium.com/@krossovochkin/kotlin-java-interop-function-references-and-sam-conversions-3d0cd36f7967

[skoric]

I think you could define your consumer like this and then pass it, but I’d have to look more into the problem to be sure:

val consumer = Consumer { ... }

[Schadenfreude]

@skoric, yes that’s how I do it currently, but I wanted to make it so I don’t have to do that… I tried making the function accept a lambda (Consumer) -> Unit as a consumer, but the subscribe method doesn’t have an override that accepts that… Oh well I guess I’ll have to live with it…