how to make exoplayer between little widget and fullscreen display

if exoplayer play in RecyclerView , when i click the fullscreen button , the exoplayer fullscreen , until i press back button , the exoplayer play in RecyclerView again

No file, test, or sample entry point is named. Start by locating the ExoPlayer usage inside a RecyclerView and trace how the fullscreen button and back action are handled. Done means playback can move to fullscreen and return to the RecyclerView when back is pressed.

Written by the indexing model from the issue text.