你可以找到recycle视图的第一个和最后一个可见的子视图，并检查你正在寻找的视图是否在范围内:

var visibleChild: View = rv.getChildAt(0)
val firstChild: Int = rv.getChildAdapterPosition(visibleChild)
visibleChild = rv.getChildAt(rv.childCount - 1)
val lastChild: Int = rv.getChildAdapterPosition(visibleChild)
println("first visible child is: $firstChild")
println("last visible child is: $lastChild")

你可以找到recycle视图的第一个和最后一个可见的子视图，并检查你正在寻找的视图是否在范围内:

var visibleChild: View = rv.getChildAt(0)
val firstChild: Int = rv.getChildAdapterPosition(visibleChild)
visibleChild = rv.getChildAt(rv.childCount - 1)
val lastChild: Int = rv.getChildAdapterPosition(visibleChild)
println("first visible child is: $firstChild")
println("last visible child is: $lastChild")

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。

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).

以下线性/网格LayoutManager方法可用于检查哪些项是可见的。

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

如果你想跟踪屏幕上可见的项目，那么你可以参考下面的博客。

https://proandroiddev.com/detecting-list-items-perceived-by-user-8f164dfb1d05