Add player to an existing project

[AbreuY]

Is there a problem if I want to add the player to an existing project?

[moneytoo]

You can do anything you want, as the Unlicense allows basically any usage. However the code is messy and any heavy lifting is done by ExoPlayer which you usually need to learn on how to work with anyway. So I would suggest starting with clean ExoPlayer and probably reusing parts from NewPipe and/or other players.