RxJava之网络请求最常见的三种场景

@GET("events")
Single<List<Event>> getEventsFeed(...);

Single<List<Event>> source =
  remoteRepository.getEventsFeed(...);
source
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(data -> {
        // Do something with data e.g. pass it to a view.
      },
      throwable -> {
        // Handle error e.g. get view to show dialog.
      }
    );

Maybe<List<Event>> source1 =
  cacheRepository.getEventsFeed(...);
Single<List<Event>> source2 =
  networkRepository.getEventsFeed(...);
Maybe<List<Event>> source = 
    Maybe.concat(source1, source2.toMaybe()).firstElement();

Single<User> source1 =
  networkRepository.getMyProfile(...);
Single<List<Tweet>> source = source1.flatMap(user -> {
    return networkRepository.getUserTweets(user.getTwitterId());
  });

Single<List<Event>> source1 =
  networkRepository.getEventsFeed(...);
Single<List<Bookmark>> source2 =
  networkRepository.getBookmarks(...);
Single<Stats> source3 =
  networkRepository.getUserStats(...);

Single<MyViewModel> source =
  Single.zip(source1, source2, source3, MyViewModel::new);

public MyViewModel(List<Event>, List<Bookmark>, Stats) {...}