multiple api request using retrofit and rx java

Question

I am new to android and I have a scenario where I want to get get data from multiple api. Let suppose api_a, api_b, api_c,

Answer 1

Merge operator combines multiple observable into one

Set up Base URL of API:

Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(Constants.BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                    .client(oktHttpClient.build())
                    .build();

Now setup two observables for the two network requests:

Observable Observable1 = ApiClient.getApiService().getApi_1();

Observable Observable2 = ApiClient.getApiService().getApi_2();

Now we use RxJava's mergemethod to combine our two Observables:

Observable.merge(Observable1, Observable2 )
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(JsonElement value) {
                        Log.d("RESPONSE", "onNext:=======" + value);
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {
                        Log.d("RESPONSE", "DONE==========");
                    }
                });