RecyclerView OnScrollListener()问题

Question

我在json中有大约32条记录,我使用RecyclerView来显示它们并且我已经实现了OnScrollListener(...)

题

我开始一个Activity,我获取了所有32条记录,现在当我滚动时,为什么我一次又一次地获得相同的32条记录,每当我滚动时,这里是我的OnScrollListener()的实现

public void initializeOnScrollForRecyclerView() {
        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

                int visibleItemCount = recyclerView.getLayoutManager().getChildCount();
                int totalItemCount = recyclerView.getLayoutManager().getItemCount();
                int pastVisiblesItems = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();

                if (!isLoading) {
                    if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
                        isLoading = true;
                        mPostPresenter.loadPosts(false);
                    }
                }
            }
        });
    }

Answer 1

实现似乎是正确的但是对于一个条件它失败了,尝试dy> 0时这样(也把它放在Activity的OnCreate中):

    private boolean loading = true;

 recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
        }


        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy)
        {

            if (loading) {
                if (dy > 0) //check for scroll down
                {
                    visibleItemCount = layoutManager.getChildCount();
                    totalItemCount = layoutManager.getItemCount();
                    pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();

                    if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
                        loading = false;

                        Log.v("...", " Reached Last Item");
                        loadMoreVideos(searchVideos);
                    }

                }
            }
        }
    });