title: how to make an expandable list of cardviews?
body: <p>I searched a lot to find a direct and clear solution for I think a popular problem but unfortunately I couldn't find it.</p>
  
  <p>We want to have a list of cardviews so each card bind to a specific data and each card has a list inside that shows meta or detail data about its parent.</p>
  
  <p>So we have a nested list inside a cardview.</p>
  
  <p>With a simple search, we know that we should use expanded list view which parents items are cardviews and we must have another layout for its child.</p>
  
  <p>So when you click on cards a list of items appears below of your cards on the root.
  But we want to show child list inside of cards?</p>
  
  <p>And there is no access to the something like child list id or any other things to refer to a transition animation and change of layout.</p>
  
  <p>So the clear question is how to add a listview inside a cardview?</p>
  
  <p>i follow my work by using tablelayout and table row. and prefer not to use external libraries for stability and version problems.
  this is what i mean.</p>
  
  <p><strong>Image that describe my question</strong></p>
  
  <p><img src="https://i.stack.imgur.com/yn6km.png" alt="image that describe my question"></p>