rxjava: Can I use retry() but with delay?

Question

I am using rxjava in my Android app to handle network requests asynchronously. Now I would like to retry a failed network request only after a certain time has passed.

Answer 1

Simply do it like this:

                  Observable.just("")
                            .delay(2, TimeUnit.SECONDS) //delay
                            .flatMap(new Func1>() {
                                @Override
                                public Observable call(String s) {
                                    L.from(TAG).d("postAvatar=");

                                    File file = PhotoPickUtil.getTempFile();
                                    if (file.length() <= 0) {
                                        throw new NullPointerException();
                                    }
                                    return Observable.just(file);
                                }
                            })
                            .retry(6)
                            .subscribe(new Action1() {
                                @Override
                                public void call(File file) {
                                    postAvatar(file);
                                }
                            }, new Action1() {
                                @Override
                                public void call(Throwable throwable) {

                                }
                            });