How to handle Item clicks for a recycler view using RxJava

Question

I was interested to find out what is the best way to respond to a item click of a recycler view.

Normally I would add a onclick() listener to the ViewHolder and pass ba

Answer 1

I would suggest you to do with your initial aproach of an observable per element on click, but in order to avoid create a new observable every time you can just cache the items emitted the first time using cache.

      /**
 * Here we can prove how the first time the items are delayed 100 ms per item emitted but second time becuase it´s cached we dont have any delay since 
 * the item emitted are cached
 */
@Test
public void cacheObservable() {
    Integer[] numbers = {0, 1, 2, 3, 4, 5};

    Observable observable = Observable.from(numbers)
                                               .doOnNext(number -> {
                                                   try {
                                                       Thread.sleep(100);
                                                   } catch (InterruptedException e) {
                                                       e.printStackTrace();
                                                   }
                                               })
                                               .cache();
    long time = System.currentTimeMillis();
    observable.subscribe(System.out::println);
    System.out.println("First time took:" + (System.currentTimeMillis() - time));
    time = System.currentTimeMillis();
    observable.subscribe(System.out::println);
    System.out.println("Second time took:" + (System.currentTimeMillis() - time));

}