Question

假设我们获得了分页API Single<List<Foo>> getFoos(pageToken: String?)并使用RxBinding来观看RecyclerView滚动事件RxRecyclerView.scrollEvents(recyclerView)。据我所知，实现一个将scroll事件转换为pageToken的运算符。这样，可流动的滚动事件取决于API的结果。我应该以递归的方式实现它还是有任何优雅的方式？

Answer 1

如果要对rxJava使用分页，则无需使用rxBinding 你可以自己做rxjava分页：

 private Observable<Integer> getScrollObservable(RecyclerView recyclerView, int limit, int emptyListCount) {
        return Observable.create(subscriber -> {
            final RecyclerView.OnScrollListener sl = new RecyclerView.OnScrollListener() {
                @Override
                public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                    if (!subscriber.isUnsubscribed()) {
                        int position = getLastVisibleItemPosition(recyclerView);
                        int updatePosition = recyclerView.getAdapter().getItemCount() - 1 - (limit / 2);
                        if (position >= updatePosition) {
                            int offset = emptyListCountPlusToOffset ? recyclerView.getAdapter().getItemCount() : recyclerView.getAdapter().getItemCount() - emptyListCount;
                            subscriber.onNext(offset);
                        }
                    }
                }
            };
            recyclerView.addOnScrollListener(sl);
            subscriber.add(Subscriptions.create(() -> recyclerView.removeOnScrollListener(sl)));
            if (recyclerView.getAdapter().getItemCount() == emptyListCount) {
                int offset = emptyListCountPlusToOffset ? recyclerView.getAdapter().getItemCount() : recyclerView.getAdapter().getItemCount() - emptyListCount;
                subscriber.onNext(offset);
            }
        });
    }

查看完整example

什么是RxJava方式的应用程序分页的最佳实践？

1 个答案: