Everybody, I got a question about lambda and SAM conversion. The subject is Android here, but my que...

# getting-started

[febs]

Everybody, I got a question about lambda and SAM conversion. The subject is Android here, but my question is actually Kotlin related so I post here.

Why if I do use the "lambda version" to override the single interface method ( top in the image) I don't have to declare the "object: " explicitly, while if I try to explicitly override the single method, I have to?
Thanks 😄

[spand]

https://kotlinlang.org/docs/reference/java-interop.html#sam-conversions

[febs]

Thanks, I read that; but I still miss it. I likely am not skilled enough to understand it. I'll try to dig deeper.

[karelpeeters]

What you have right now is the point: the first code is just syntax sugar for the second code, they're equivalent.

[spand]

Just to add to what @karelpeeters said. The only reason you can do it is because the OnClickListener is a Java interface. For some reason it is not allowed for kotlin interfaces.

[febs]

It would be interesting to know why then. It could be very handy nevertheless.

[karelpeeters]

For Kotlin code you'd just use a function type, eg. (Event) -> Boolean so no need for SAM conversion. There's an open youtrack issue about it though.