No scrolling effect with ScrollView in PopupWindow
<p>I want to implement a popup menu with complex effects, one of them is to support scrolling. It seems PopupMenu and AlertDialog can not meet the requirement what I need. So I tried PopupWindow with ScrollView.</p>

<p>Firstly, I prepared a layout which has a simple strcture just like what ApiDemo shows:</p>

<pre><code>ScrollView
    LinearLayout with Vertical attribute
       TextView
       TextView  
       TextView  
       ...  
</code></pre>

<p>Secondarily, I new a PopupWindow with this layout and 200width/300height, show it at somewhere with showAtLocation().</p>

<p>I can make scrollbar displayed and has scroll effect, but TextViews in LinearLayout do NOT scroll(they are in fixed position)!</p>

<p>Something is wrong but I have no sense on it.
(android3.0)</p>

<p>Thanks for any warm-heart man who can give me some tips.</p>

<p>-_-!!</p>
