rx java2 - RxJava Single.concat -


i have following code:

 model.getcategories()                 .subscribeon(schedulers.io())                 .observeon(androidschedulers.mainthread())                 .subscribe(new action1<list<category>>()                 {                     @override                     public void call(final list<category> categories)                     {                         model.getunits()                                 .subscribeon(schedulers.io())                                 .observeon(androidschedulers.mainthread())                                 .subscribe(new action1<list<unit>>()                                 {                                     @override                                     public void call(list<unit> units)                                     {                                         view.showaddproductdialog(units, categories);                                     }                                 });                     }                 });

i have ugly nesting. how can fix it. tried this:

single.concat(model.getcategories(), model.getunits())                 .subscribeon(schedulers.io())                 .observeon(androidschedulers.mainthread())                 .subscribe(new action1<list<? extends object>>()                 {                     @override                     public void call(list<? extends object> objects)                     {                         //                     }                 });

but problem cannot determinate whether list<category> or list<unit> comes.

is there way use concat , detect kind of stream comes (list<category> or list<unit> or else) ?

also need detect observers completed perform action.

thanks in advice.

use single.zip():

single.zip(     getcategories().subscribeon(schedulers.io()),     getunits().subscribeon(schedulers.io()),     (a, b) -> pair.of(a, b) ) .observeon(androidschedulers.mainthread()) .subscribe(     pair -> view.showaddproductdialog(pair.first, pair.second),     error -> showerror(error.tostring()) )

where pair can tuple implementation, i.e., this.


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