title: android RecyclerView onScrolled not call
body: <p>I want to load last chapter when pull down and load next chapter when pull up,but get some problems, when I inited the first page ,then I pull up to load last chapter, the recyclerview not call onScrolled. But if I pull down small distance then pull down ,I can get the result ,here is my code:</p>
  
  <pre><code>recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
  @Override
  public void onScrolled (RecyclerView recyclerView, int dx, int dy) {
      super.onScrolled(recyclerView, dx, dy);
      if(dy &lt; 0 &amp;&amp; mLayoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
          getNextChapter();
      }
      if(dy &gt; 0 &amp;&amp;
          mLayoutManager.findLastCompletelyVisibleItemPosition() ==
          mAdapter.getItemCount() - 1) {
          getNextChapter();
       }
       Logger.i("onScrolled:" + dy);
      }
  });
  </code></pre>