As I understand – you need to make a request based on result of another request and combine both results. For that purpose you can use this flatMap operator variant: Observable.flatMap(Func1 collectionSelector, Func2 resultSelector)
Returns an Observable that emits the results of a specified function to the pair of values emitted by the source Observable and a specified collection Observable.
Simple example to point you how to rewrite your code:
private Observable<String> makeRequestToServiceA() {
return Observable.just("serviceA response"); //some network call
}
private Observable<String> makeRequestToServiceB(String serviceAResponse) {
return Observable.just("serviceB response"); //some network call based on response from ServiceA
}
private void doTheJob() {
makeRequestToServiceA()
.flatMap(new Func1<String, Observable<? extends String>>() {
@Override
public Observable<? extends String> call(String responseFromServiceA) {
//make second request based on response from ServiceA
return makeRequestToServiceB(responseFromServiceA);
}
}, new Func2<String, String, Observable<String>>() {
@Override
public Observable<String> call(String responseFromServiceA, String responseFromServiceB) {
//combine results
return Observable.just("here is combined result!");
}
})
//apply schedulers, subscribe etc
}
Using lambdas:
private void doTheJob() {
makeRequestToServiceA()
.flatMap(responseFromServiceA -> makeRequestToServiceB(responseFromServiceA),
(responseFromServiceA, responseFromServiceB) -> Observable.just("here is combined result!"))
//...
}