And,Then和When

private void loadList(List<AppInfo> apps) {
​
    mRecyclerView.setVisibility(View.VISIBLE);
​
    Observable<AppInfo> observableApp = Observable.from(apps);
​
    Observable<Long> tictoc = Observable.interval(1, TimeUnit.SECONDS);
​
    Pattern2<AppInfo, Long> pattern = JoinObservable.from(observableApp).and(tictoc); 
​
    Plan0<AppInfo> plan = pattern.then(this::updateTitle);
​
    JoinObservable
        .when(plan)
        .toObservable()
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new Observer<AppInfo>() {
​
            @Override
            public void onCompleted() {
                Toast.makeText(getActivity(), "Here is the list!", Toast.LENGTH_LONG).show();
            }
​
            @Override
            public void onError(Throwable e) {
                mSwipeRefreshLayout.setRefreshing(false); 
                Toast.makeText(getActivity(), "Something went wrong!", Toast.LENGTH_SHORT).show();
            }
​
            @Override
            public void onNext(AppInfoappInfo) {
                if (mSwipeRefreshLayout.isRefreshing()) { 
                mSwipeRefreshLayout.setRefreshing(false);
                } 
                mAddedApps.add(appInfo);
                int position = mAddedApps.size() - 1;
                mAdapter.addApplication(position, appInfo); mRecyclerView.smoothScrollToPosition(position);
            } 
        });
}

JoinObservable.from(observableApp).and(tictoc);

pattern.then(this::updateTitle);

.when(plan).toObservable()