RecyclerView向上/向下滚动侦听器

问题描述：

我们如何知道用户在RecyclerView中是向下滚动还是向上滚动?

How do we know if user scrolled down or up in RecyclerView ?

我尝试使用RecyclerView#OnScrollListener，它给出了垂直滚动量和滚动状态.开始滚动时如何获得最后的滚动位置，滚动状态为空闲时如何获得滚动位置.

I tried with RecyclerView#OnScrollListener , it gives the amount of vertical scroll and the scroll state. How do we get the last scroll position when started to dragging and scrolled position when scroll state idle.

谢谢.

答

尝试这种方式:

private static int firstVisibleInListview;

firstVisibleInListview = yourLayoutManager.findFirstVisibleItemPosition();

在滚动侦听器中:

public void onScrolled(RecyclerView recyclerView, int dx, int dy) 
{
    super.onScrolled(recyclerView, dx, dy);

    int currentFirstVisible = yourLayoutManager.findFirstVisibleItemPosition();

    if(currentFirstVisible > firstVisibleInListview)
       Log.i("RecyclerView scrolled: ", "scroll up!");
    else
       Log.i("RecyclerView scrolled: ", "scroll down!");  

    firstVisibleInListview = currentFirstVisible;

}

RecyclerView向上/向下滚动侦听器

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