android - 使用 Observable.from 和 flatMap 对 Array 中的每个项目执行操作，不会调用 onComplete

Question

我正在使用 Rx-Java 对数组中的每个项目执行 api 调用。我希望在所有操作完成后调用 OnComplete 操作，但它没有被调用。对数组项的操作确实成功完成。

public Observable<User> report(Long[] userIds) {
    return Observable.from(userIds).flatMap(new Func1<Long, Observable<User>>() {
        @Override
        public Observable<User> call(Long id) {
            return reportSpam(id);
        }
    });
}

public Observable<User> report(final Long id) {
    return Observable.create(new Observable.OnSubscribe<User>() {
        @Override
        public void call(Subscriber<? super User> subscriber) {
            try {
                twitter.report(id);
            } catch (TwitterException e) {
                subscriber.onError(e);
            }
        }
    });
}

final Long[] usersIds = selectedToUsersIds();

report(usersIds).subscribeOn(Schedulers.newThread())
    .observeOn(AndroidSchedulers.mainThread()).subscribe(new Action1<User>() {
        @Override
        public void call(User user) {
            //nothing to do here, don't even need the User
        }
    }, new Action1<Throwable>() {
        @Override
        public void call(Throwable throwable) {
        //handle this
        }
    }, new Action0() {
        @Override
        public void call() {
            Toast.makeText(getActivity(), getString(R.string.reported_for_spam, usersIds.length), Toast.LENGTH_SHORT).show();
        }
});

Answer 1

你需要打电话subscriber.onCompleted()进来Observable<User> report(final Long id)。Observable应始终调用onCompleted或onError在流的末尾。