title: expandable layout with recyclerview android
body: <p>i have problem with recyclerview and ExpandableLayout , i want to collapse and expand my recyclerview not one item on it , but when expand recyclerview height is 0dp
  and no show any data in the adapter </p>
  
  <p>i try to used this two library and have the </p>
  
  <p><a href="https://github.com/AAkira/ExpandableLayout" rel="nofollow noreferrer">https://github.com/AAkira/ExpandableLayout</a></p>
  
  <p><a href="https://github.com/traex/ExpandableLayout" rel="nofollow noreferrer">https://github.com/traex/ExpandableLayout</a></p>
  
  <p>but get same problem expand cant see any item on recyclerview </p>
  
  <p>i try to use 
   mExpandableLayout1.invalidate(); to update it but do nothing</p>
  
  <p>but when i add minHeigh on recyclerview i can show one item as heigh i added  </p>
  
  <p><a href="https://i.stack.imgur.com/M6VJb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/M6VJb.png" alt="enter image description here"></a></p>