Retrofit & RxJava multiple requests complete

Question

I need to do:

1. Request 2 lists of news from different websites
2. Combine results from requests
3. Sort items by date
4. Get 10 newest news
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Answer 1

You can use zip operator to call 2 requests async and save or process their data on response.

For example.

Below are two Observable

Observable responseOneObservable = getRetrofitClient().getDataOne()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());

Observable responseTwoObservable = getRetrofitClient().getDataTwo()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread());

Using zip operator on above two Observable as below.

Observable> testDataObservable = Observable.zip(responseOneObservable, responseTwoObservable, new Func2>() {
            @Override
                public ArrayList call(ResponseOne responseOne, ResponseTwo responseTwo) {
                  ArrayList testDataList = new ArrayList();
                      // process data from response responseOne & responseTwo
                  return testDataList;
            } 
    })
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(new Subscriber>() {

        @Override
        public void onNext(ArrayList testDataList) {

        }

        @Override
        public void onCompleted() {
            Log.d(TAG, "onCompleted" ); 
            // you can show alert here or do something when completed 
        }

        @Override
        public void onError(Throwable t) {
            Log.d(TAG, "onError Throwable: " + t.toString() );
        }
    });