title: android VIewpager How to achieve the bound effect
body: <p>I google the question many days. Find a solution which is  add a blank View int the first and end  of Viewpager. when viewpager.getcurrentItem()==0,then rePoint to 1. 
  In my opinion this approach is very poor。
  Because, this solution change the viewpager.getcount(). may cause many problem.</p>
  
  <p>I find a class to hanler this,
  <a href="http://developer.android.com/reference/android/support/v4/widget/EdgeEffectCompat.html" rel="nofollow">http://developer.android.com/reference/android/support/v4/widget/EdgeEffectCompat.html</a>
  But I do not know how to use it！
  Can someone give me an example?</p>
  
  <p>like that 
  <a href="https://docs.google.com/open?id=0B9poNqa96rJyLU5Va0lnMHJGY0k" rel="nofollow">https://docs.google.com/open?id=0B9poNqa96rJyLU5Va0lnMHJGY0k</a></p>
  
  <p>When I release the finger back to the original position</p>