hey, I've got a problem: I'm trying to use Retrofi...

# android

[Leon K]

hey, I've got a problem: I'm trying to use Retrofit with the Kotlin Coroutine-integration (just make the functions in the API interface suspend and return the data directly, without being wrapped in Call)
but as soon as i try to do this, i get java.lang.IllegalArgumentException: Could not locate call adapter for class java.lang.Object.
any ideas? if i use the Call wrapped way it works

[Dustin Lam]

Make sure you're using retrofit 2.6.0+

[Dustin Lam]

As it wasn't added until then I believe

[gildor]

Could you show declaration of this Retrofit method

[gildor]

CallAdapter is not needed for Coroutines and suspend functions, now it's part of core Retrofit

[Dustin Lam]

Oh you're right - my mistake!

[ursus]

@gildor why is that? what if I only want to use rx

[gildor]

why is that

I didn’t get your question. Retrofit supports suspend functions out of the box now, no need to have any adapters.
Rx requires adapter

[Dustin Lam]

I think he means he shouldnt have to take the coroutines dependency if he is using rx

[gildor]

No, suspend function is part of Kotlin itself and stdlib, it has nothing to do with kotlinx.coroutines.
And because Retrofit is written now in Kotlin you anyway have dependency on Kotlin stdlib

[Dustin Lam]

kotlinx.coroutines is an optional dependency of retrofit

[gildor]

Yes, it’s optional, to support cancellation and provide Call.await()