判斷RecyclerView是否滑動到底部

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

            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                View lastChildView = recyclerView.getLayoutManager().getChildAt(recyclerView.getLayoutManager().getChildCount() -1);
                int lastChildBottom = lastChildView.getBottom();
                int recyclerBottom = recyclerView.getBottom() - recyclerView.getPaddingBottom();
                int lastPosition = recyclerView.getLayoutManager().getPosition(lastChildView);

                if (lastChildBottom == recyclerBottom && lastPosition == recyclerView.getLayoutManager().getItemCount() - 1) {
                    //滑動到底部
                    // do something...
                }

            }
        });