Hey, have you try to download your Spotify Music for offline listening. You can use TuneFab Spotify Music Converter to download your Spotify Music for offline listening and then you can cast Chromecast for playing.
Posts made by ericmcmahon
RE: Play Spotify Playlist on Android
Have you downloaded your Spotify Playlists on your Android Devices? There might be some internet problem for a failure of playing Spotify Music on Android Devices. If you want to get rid of this problem, you can try to use Spotify Music Converter for download all your Spotify Music playlists for offline listening.