android - RecyclerView OnScrollListener() 问题

Question

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

问题

我启动了一个 Activity ，我获取了所有 32 条记录，现在当我滚动时，为什么我再次一次又一次地获得相同的 32 条记录，每当我滚动时，这是我对 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，但在一个条件下它失败了，当 dy > 0 时像这样尝试(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);
                    }

                }
            }
        }
    });