how can i add additional items in recycleview?

1. Create a generic list.
2. add all your existing items to that list
3. add your new item to the end of the list
4. create two types of viewtype based on instances from generic list
5. create two viewholders with different layouts
6. then on oncreateviewholder method decide which view holder to attach based on view type.

May be refer this answer: https://stackoverflow.com/a/46454246/2404063