recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            //用來標記是否正在向最後一個滑動,即是否向右滑動或向下滑動
boolean isSlidingToLast = false;

            @Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();
                //
 
當不滾動時
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
                    //獲取最後一個完全顯示的ItemPosition
int lastVisibleItem = manager.findLastCompletelyVisibleItemPosition();
                    int totalItemCount = manager.getItemCount();
                    //判斷是否滾動到底部，並且是向右滾動
if (lastVisibleItem == (totalItemCount - 1
 
) && isSlidingToLast) {
//                        addItem();
//                        adapter.notifyDataSetChanged();
}
                }
            }

            @Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                //dx
 
用來判斷橫向滑動方向，dy用來判斷縱向滑動方向
if (dx > 0) {
                    //大於0表示向右滾動
isSlidingToLast = true;
                } else {
                    //小於等於0表示停止或向左滾動
isSlidingToLast = false;
                }
            }
        });