RxJava 操作符 interval

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/**     * Returns an Observable that emits a sequential number every specified interval of time.     * <p>     * <img width="640" height="195" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/interval.png" alt="">     * <dl>     *  <dt><b>Scheduler:</b></dt>     *  <dd>{@code interval} operates by default on the {@code computation} {@link Scheduler}.</dd>     * </dl>     *      * @param interval     *            interval size in time units (see below)     * @param unit     *            time units to use for the interval size     * @return an Observable that emits a sequential number each time interval     * @see <a href="https://github.com/ReactiveX/RxJava/wiki/Creating-Observables#interval">RxJava wiki: interval</a>     */    public final static Observable<Long> interval(long interval, TimeUnit unit) {        return interval(interval, unit, Schedulers.computation());    }

interval操作符，类似于计数器，测试代码如下：

public void test() {    Observable.interval(1, TimeUnit.SECONDS).subscribe(new Subscriber<Long>() {      @Override public void onCompleted() {        Log.e("------ onNext ", "onCompleted");      }      @Override public void onError(Throwable e) {      }      @Override public void onNext(Long aLong) {        Log.e("------ onNext ", "aLong : " + aLong);      }    });  }

日志如下：

04-22 19:40:37.542  11947-11960/com.fernandocejas.android10.sample.presentation E/------ onNext﹕ aLong : 004-22 19:40:38.532  11947-11960/com.fernandocejas.android10.sample.presentation E/------ onNext﹕ aLong : 104-22 19:40:39.542  11947-11960/com.fernandocejas.android10.sample.presentation E/------ onNext﹕ aLong : 2

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