``` Observable.zip(aObservable, ...

# android

[eschrag]

Observable.zip(aObservable,
                bObservable,
                cObservable,
                dObservable,
                Function4<A, B, C, D, CombinedType>
                { a, b, c, d ->
                    // build CombinedType here
                })

has worked for me (for an example combining four types)