These are the sources of "Delete Spotify track",
to be found here on the play store:
https://play.google.com/store/apps/details?id=org.bamboomy.delete.deletespotifytrack
I opensourced them to aid anyone who wants to make an iOs version of the app,
If there is help needed to anything related to Spotify I can help,
for any iOs specific problem you are on your own (or use this link:
or this one ;-)
The users will be thankfull :-D
S.