title: ClassCastException when adding LayoutParams
body: <p>Which class do I have to use, when setting the <code>LayoutParams</code> of my <code>LinearLayout</code>? The following two are not working:</p>
  
  <ol>
  <li><code>linLayout.setLayoutParams(new ViewGroup.LayoutParams(50,50));</code></li>
  <li><code>linLayout.setLayoutParams(new android.widget.LinearLayout.LayoutParams(50,50));</code></li>
  </ol>
  
  <p>if I get the params first, change them and set them back it's working. So I suppose the Params I get returned inherit from ViewGroup.LayoutParams...</p>
  
  <p>Any idea? THX</p>