检查RecyclerView是否可滚动 [英] Check if RecyclerView is scrollable

问题描述

如何检查RecyclerView是否可滚动，即可见区域下方/上方有项目

How to check if a RecyclerView is scrollable, ie, there are items below/above the visible area

我的回收站视图中有一个下拉列表，可通过使用notifyItemRangeInserted()和notifyItemRangeRemoved()进行操作.每当发生这种情况时，我都想检查RecyclerView是否可滚动，因为我必须相应地调整另一个视图，例如报亭中的横幅广告

I have a dropdown in my recycler view which works by using notifyItemRangeInserted() and notifyItemRangeRemoved(). Whenever any of this happens, I want to check if the RecyclerView is scrollable or not, as I have to adjust another view, a banner like in newsstand, accordingly

推荐答案

去那里:

public boolean isRecyclerScrollable() {
  LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
  RecyclerView.Adapter adapter = recyclerView.getAdapter();
  if (layoutManager == null || adapter == null) return false;

  return layoutManager.findLastCompletelyVisibleItemPosition() < adapter.getItemCount() - 1;
}

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