title: check if an android scrollview can scroll
body: <p>Do you know if it is possible to know if an Android Widget ScrollView can scroll?
  If it has enough space it doesn't need to scroll, but as soon as a dimension exceeds a maximum value the widget can scroll.</p>
  
  <p>I don't see in the reference a method who can give this information.
  Maybe is it possible to do something with the size of the linearlayout inside the scrollview?</p>