[android] endless scroll listener sample

/**
 * Detects when user is close to the end of the current page and starts
 * loading the next page so the user will not have to wait (that much) for the
 * next entries.
 * 
 * @author Ognyan Bankov
 */
public class EndlessScrollListener implements OnScrollListener
{
  // how many entries earlier to start loading next page
  private int visibleThreshold = 5;
  private int previousTotal = 0;
  private boolean loading = true;
  
  
  @Override
  public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
  {
    if (loading)
    {
      if (totalItemCount > previousTotal)
      {
        loading = false;
        previousTotal = totalItemCount;
      }
    }
    if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold))
    {
      // I load the next page of gigs using a background task,
      // but you can call any function here.
      loadPage();
      loading = true;
    }
  }
  
  
  @Override
  public void onScrollStateChanged(AbsListView view, int scrollState)
  {
    
  }
}

소스 참고 : https://github.com/ogrebgr/android_volley_examples/blob/master/src/com/github/volley_examples/Act_NetworkListView.java