RxJava Timer for fun

Timer.java

/**
 * Rx based timer that implements a simple timer functionality. Should be
 * disposed when it goes out of scope since RxJava leaks otherwise.
 *
 * @author Pär Amsen 05/2017
 */
public class Timer {
    private Observable<Void> timer;
    private long time;
    private boolean started;

    public Timer() {
        timer = Observable.<Void>create(sub -> {
            while (started && sub.isUnsubscribed()) {
                time += 10;

                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                }
            }

            sub.onCompleted();
        }).subscribeOn(Schedulers.newThread()).observeOn(AndroidSchedulers.mainThread());
    }

    public void start() {
        time = 0;
        started = true;
        timer.subscribe();
    }

    public void pause() {
        started = false;
    }

    public void resume() {
        started = true;
        timer.subscribe();
    }

    public long stop() {
        started = false;
        return time;
    }

    public long getTime() {
        return time;
    }

    public void dispose() {
        started = false;
        timer = null;
    }
}