Multiple requests with retrofit to combine results
<p>Im using retrofit (1.9) and trying to work out how i can call 2 apis and merge the results.</p>

<p>I guess the results should be merged when last api has finished returning a response...</p>

<p>How can i do this?</p>

<p>Udpate, as per Antons answer I have tried the following:</p>

<p>added to gradle:</p>

<pre><code>  compile 'io.reactivex:rxjava:1.0.+'
    compile 'io.reactivex:rxandroid:0.23.+'
</code></pre>

<p>Api interface</p>

<pre><code> @GET("/maps/api/place/details/json")
    Observable&lt;PlaceDetailResult1&gt; getPlacesFrom1( @Query("key") String key,  @Query("placeid") String placeid);


@GET("api/places/{id}/ratings")
Observable&lt;PlaceDetailResult2&gt; getPlacesFrom2(@Path("id") String id);
</code></pre>

<p>In fragment</p>

<pre><code>     IPlaces api = adapter.create(IPlaces.class); //endpoint1
     IPlaces api2 = adapter2.create(IPlaces.class); //endpoint2

    Observable.combineLatest(
            api.getPlacesFrom1("key", placeId),
            api2.getPlacesFrom2(placeId),
        new Func2&lt;PlaceDetailResult1, PlaceDetailResult2, MergedReviews&gt;() {
            @Override
            public MergedReviews call(PlaceDetailResult placeDetailResult1, PlaceDetailResult2 placeDetailResult2) {
                // processToMerge(  placeDetailResult1, placeDetailResult2)
                return mr;
            }

            })
            .subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Observer&lt;MergedReviews&gt;() {
                @Override
                public void onCompleted() {

                }

                @Override
                public void onError(Throwable e) {

                }

                @Override
                public void onNext(MergedReviews mr) {

                    SetAdapter(mr.reviews);
                    SetPhotosAdapter(mr.photos);
                }
            });
</code></pre>

<p>One thing maybe worth noting, when I added RxJava to gradle i was getting some error, which went away after I did <code>multiDexEnabled true</code> in the gradle file</p>