why?

# getting-started

[ivano]

why?

[marstran]

Can you please make your example compilable?

[marstran]

Anyway, my guess is that it's because listener is a local variable inside method.

[ivano]

so should work?

[ivano]

if I do it as instance variable

[marstran]

Probably. But I really have no idea, because your example makes no sense at all.

[ivano]

in Java we used to use interfaces to communicate between fragments/activities

[ivano]

I cannot do the same thing in Kotlin

[marstran]

This seems to have nothing to do with interfaces vs lambdas. Your listener is just defined in the wrong scope.

[ivano]

I want to launch some data to a Fragment when get executed at a certain point to another activity

[marstran]

You need to make a compilable example if you want us to be able to help you.

[ivano]

OK, you mean a git repository?

[marstran]

No, just edit your first post. The code snippet you posted doesn't compile.

[ivano]

ah i get

[ivano]

done it:)

[rook]

This works:

fun main() {
    val myFoo = Foo()
    myFoo.call = { println("hello") }
    
    myFoo.call?.invoke()
}

class Foo(var call: (() -> Unit)? = null)