title: android set ExpadableListview height dynamically
body: <p>i have <code>ExpandableListview</code> inside <code>ScrollView</code> and i know that's not good but i had too, the only solution to show the whole list is by set its height by code using <code>layoutParams</code></p>
  
  <p>RelativeLayout.LayoutParams params = new
  RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT,
  ExpandableListViewData.length());</p>
  
  <p>i came up with a solution that every time i expand a group of the list am gonna change the height to fit with new height</p>
  
  <p>this solution is good but i can't figure a Fixed Value for height to give to the Params at the first time, SO is there a way to know the actual size from the size of the array</p>