如果可见的项目位置与项目位置不同，吐司消息将显示在屏幕上。

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

            LinearLayoutManager manager= (LinearLayoutManager) myRecyclerview.getLayoutManager();
            assert manager != null;
            int visiblePosition = manager.findLastCompletelyVisibleItemPosition();


            if(visiblePosition > -1&&a!=visiblePosition) {
                Toast.makeText(context,String.valueOf(visiblePosition),Toast.LENGTH_SHORT).show();
                //do something
                a=visiblePosition;

            }
        }

        @Override
        public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            //Some code while the list is scrolling


        }
    });

对于那些需要在RecyclerView适配器中实现逻辑的人来说，您仍然可以使用@ernesto方法结合on scrollListener来在咨询RecyclerView时获得您想要的东西。 在适配器内部，你会有这样的东西:

@Override
    public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if(manager instanceof LinearLayoutManager && getItemCount() > 0) {
            LinearLayoutManager llm = (LinearLayoutManager) manager;
            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) {
                    super.onScrolled(recyclerView, dx, dy);
                        int visiblePosition = llm.findFirstCompletelyVisibleItemPosition();
                        if(visiblePosition > -1) {
                            View v = llm.findViewByPosition(visiblePosition);
                            //do something
                            v.setBackgroundColor(Color.parseColor("#777777"));
                        }
                }
            });
        }
    }

上面的每个答案都是正确的，我也想添加一个快照从我的工作代码。

recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
           // Some code when initially scrollState changes
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            // Some code while the list is scrolling
            LinearLayoutManager lManager = (LinearLayoutManager) recyclerView.getLayoutManager();
            int firstElementPosition = lManager.findFirstVisibleItemPosition();
            
        }
    });

您可以使用recyclerView.getChildAt()来获取每个可见的子视图，并在适配器代码中对这些视图设置一些convertview.setTag(index)标记将帮助您将其与适配器数据关联起来。

第一个/最后一个可见子节点依赖于LayoutManager。 如果您正在使用LinearLayoutManager或GridLayoutManager，您可以使用

int findFirstVisibleItemPosition();
int findFirstCompletelyVisibleItemPosition();
int findLastVisibleItemPosition();
int findLastCompletelyVisibleItemPosition();

例如:

GridLayoutManager layoutManager = ((GridLayoutManager)mRecyclerView.getLayoutManager());
int firstVisiblePosition = layoutManager.findFirstVisibleItemPosition();

对于LinearLayoutManager，第一个/最后一个取决于适配器的顺序。不要从RecyclerView中查询子元素;LayoutManager可能更倾向于布局比缓存可见的更多的项。

对于StaggeredGridLayoutManager执行以下操作:

RecyclerView rv = findViewById(...);
StaggeredGridLayoutManager lm = new StaggeredGridLayoutManager(...);
rv.setLayoutManager(lm);

要获得可见的项目视图:

int[] viewsIds = lm.findFirstCompletelyVisibleItemPositions(null);
ViewHolder firstViewHolder = rvPlantios.findViewHolderForLayoutPosition(viewsIds[0]);
View itemView = viewHolder.itemView;

记得检查它是否为空。