RxJava Return single, execute completable after

Question

I'm trying to accomplish the following: Return some data as single, execute a completable after. The following code does not compile due to single.andThen(). The actions need to be executed in this order.

val single = Single.create<String> { it.onSuccess("result") }
val completable = Completable.create { println("executing cleanup") }
val together = single.andThen(completable)

together.subscribe(
        { println(it) },
        { println(it) }

)

Answer 1

Use flatMap:

single.flatMap(v -> completable.andThen(Single.just(v)))

Answer 2

Note that if you don't care whether the result is Single or Completable there is a special flatMapCompletable operator in RxJava2 to execute completable after Single:

single.flatMapCompletable(result -> completable);

Answer 3

Assuming you actually want to return the Single after the Completable, here's another way:

Using Java:

single.flatMap(x -> completable.toSingleDefault(x))

Using Kotlin:

single.flatMap { completable.toSingleDefault(it) }