如何找到滚动[重复]时显示在RecyclerView顶部的项目

Question

我一直在寻找一个适当的API来做我需要做的事情，我几乎可以肯定的是，必须有一个API。但我找不到。

private ArrayList<Transaction> filteredTransactions = new ArrayList<>();
...            

recyclerView = view.findViewById(R.id.feed_recycle_view);
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager((getActivity()));
        adapter = new FeedAdapter(filteredTransactions);
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setAdapter(adapter);

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
}

提前致谢

Answer 1

findFirstCompletelyVisibleItemPosition（）将返回第一个完全可见视图的适配器位置。

你可以这样做：

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);

                int itemPoition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstCompletelyVisibleItemPosition();

                // Get the item from the list
                mList.get(itemPoition)

            }