将订户添加到单个观察值

Question

I would like to know how can I add the subscriber for single as shown below in the code. when i try to add .subscribe() or .blockingsubscribe() the autocomplete in eclise does not show them

code :

Single<List<List<Person>>> singles = Single.just(Main.getPersons());
    singles
    .observeOn(Schedulers.io())
    .map(x->System.out.println(x.size()))

Answer 1

Your map function should return something that you want to subscribe on:

.map(x -> {
    System.out.println(x.size());
    return ???;
 });

Answer 2

You are using the wrong lambda and it throws off your IDE. Try this:

Single<List<List<Person>>> singles = Single.just(Main.getPersons());
singles
.observeOn(Schedulers.io())
.doOnSuccess(x -> System.out.println(x.size()))
.  // <---------------------------------------- now it should bring up the autocomplete