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();
            
        }
    });

最后，我找到了一个解决方案，从适配器中的onBindViewHolder事件了解当前项是否可见。

关键是来自LayoutManager的isViewPartiallyVisible方法。

在您的适配器中，您可以从RecyclerView中获得LayoutManager，它作为参数从onAttachedToRecyclerView事件中获得。

对于那些在Kotlin中寻找答案的人:

fun getVisibleItem(recyclerView : RecyclerView) {
        recyclerView.addOnScrollListener(object: RecyclerView.OnScrollListener() {
            override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                 if(newState == RecyclerView.SCROLL_STATE_IDLE) {
                     val index = (recyclerView.layoutManager.findFirstVisibleItemPosition
                     //use this index for any operation you want to perform on the item visible on screen. eg. log(arrayList[index])
                 }
            }
        })
    }

您可以根据您的用例探索获取该职位的其他方法。

int findFirstCompletelyVisibleItemPosition()
int findLastVisibleItemPosition()
int findLastCompletelyVisibleItemPosition()

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。

Addendum: The proposed functions findLast...Position() do not work correctly in a scenario with a collapsing toolbar while the toolbar is expanded. It seems that the recycler view has a fixed height, and while the toolbar is expanded, the recycler is moved down, partially out of the screen. As a consequence the results of the proposed functions are too high. Example: The last visible item is told to be #9, but in fact item #7 is the last one that is on screen. This behaviour is also the reason why my view often failed to scroll to the correct position, i.e. scrollToPosition() did not work correctly (I finally collapsed the toolbar programmatically).

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。