如何使RxJava间隔立即执行操作

Question

您好我正在观察我的服务器每15秒询问其在线/离线状态:

public Observable<Response> repeatCheckServerStatus(int intervalSec, final String path) {
        return Observable.interval(intervalSec, TimeUnit.SECONDS)
                .flatMap(new Func1<Long, Observable<Response>>() {
                    @Override
                    public Observable<Response> call(Long aLong) {
                        return Observable.create(new Observable.OnSubscribe<Response>() {
                            @Override
                            public void call(Subscriber<? super Response> subscriber) {
                                try {
                                    Response response = client.newCall(new Request.Builder()
                                            .url(path + API_ACTION_CHECK_ONLINE_STATUS)
                                            .header("Content-Type", "application/x-www-form-urlencoded")
                                            .get()
                                            .build()).execute();

                                    subscriber.onNext(response);
                                    subscriber.onCompleted();
                                    if (!response.isSuccessful())
                                        subscriber.onError(new Exception());
                                } catch (Exception e) {
                                    subscriber.onError(e);
                                }
                            }
                        })
                                .subscribeOn(Schedulers.io())
                                .observeOn(AndroidSchedulers.mainThread());
                    }
                });

    }

在我调用此方法之后,首先执行代码将在intervalSec时间之后(在我的情况下为15秒).查看区间方法的rxJava文档:

http://reactivex.io/documentation/operators/interval.html

这应该是这样的.

问题:有没有办法立即执行代码然后重复间隔？

Answer 1

您可以立即执行它,如下所示:

Observable.interval(0, 1000, TimeUnit.MILLISECONDS).subscribe();

Answer 2

你在寻找什么 startWith

Observable.interval(15, SECONDS).startWith(1);

这将从间隔获得更新,但在订阅后立即发出一个项目.