Use Google's Assistant
Google's Assistant is becoming more available nowadays, and I think it would be awesome to be able to use it to control my media-player. Like "Ok Google, play my music" or "Ok Google, continue the movie".
As far as I understand how the Assistant works, it uses deep-linking to call various functions.
I guess it's similar to how the widgets work? So maybe it is quite easy to integrate?
Btw, I think the same holds for the app-shortcuts in Android N and O.