Writing subsequent API requests with RxJava2 in Java

Question

I need to write subsequent requests in my Android project. So first an API request is made and when the asynchronous response comes back, the response are used in the second request, and so on.

I've been studying the RxJava2 library but I haven't comprehended fully yet. Furthermore, the RxJava code will be in an Interactor class, that will call functions that reside in a repository, so I don't want to write out code directly inside the RxJava2 code, but call functions from another class. A GitHub repo that cover these areas would be very useful for me.

Just read some about it, but I can't see right away how that'll help me. Some real examples would be very helpful. — Max
– Max, Commented Jan 15, 2018 at 8:50
You can see some examples of flatMap here github.com/politrons/reactive/blob/master/src/test/java/rx/… — paul
– paul, Commented Jan 15, 2018 at 11:38

akarnokd · Accepted Answer · 2018-01-15 10:09:02Z

3

The flatMap operator is a canonical way for specifying continuations that depend on the result(s) of a previous source(s):

retrofitAPI.getData(params)
.flatMap(data -> 
     retrofitAPI.getMoreData(data)
     .flatMap(moreData -> retrofitAPI.getEvenMoreData(data, moreData))
)

answered Jan 15, 2018 at 10:09

akarnokd

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1 Comment

Max Over a year ago

Thanks! Just the kind of answer I was hoping for, will definitely test this.

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