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 

i try to used this two library and have the 

<https://github.com/AAkira/ExpandableLayout>

<https://github.com/traex/ExpandableLayout>

but get same problem expand cant see any item on recyclerview 

i try to use 
 mExpandableLayout1.invalidate(); to update it but do nothing

but when i add minHeigh on recyclerview i can show one item as heigh i added 

[![enter image description here](https://i.stack.imgur.com/M6VJb.png)](https://i.stack.imgur.com/M6VJb.png)