Android RxJava Observable.interval（）不会停止发出项目

Question

I have a static field

 private static Subscription timer;

and two static methods:

public static void setTimer() {
    timer = Observable.interval(2, TimeUnit.SECONDS, Schedulers.computation())
            .doOnNext(tick -> update(tick))
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe();
}

public static void removeTimer() {
    if (timer != null && !timer.isUnsubscribed()) {
        timer.unsubscribe();
        timer = null;
    }
}

Guessing after unsubsription Observable have to stop emitting items. However it doesn't work. If function updatePrices is

private static void update(long tick) {
    Log.d(TAG, "tick");
}

Logs continue to be printed after calling removeTimer().

So the question is how to stop emitting items in my observable correctly?

Solved

The issue was in double calling of setTimer().

However I still have a question. Can anybody explain why is the old copy of timer still continues to emit items after the second call of setTimer()?

Answer 1

Maybe too late, But may it help others!

Observable.interval(TICK_MILLIS, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread())
                .map(v -> v * TICK_MILLIS) // use to map value to onNext func,
                .takeUntil(v -> v > MAX_TICKS) // Stop Timer here.
                .take() // You can use take to stop timer after N count
                .subscribe(this::onNext, Log::d ,this::onComplete);