Great work on DSub. The regular updates are excellent and it's a great improvement over the official Android app. I wanted to suggest a few ideas to improve the app.
First, I'd like to request the ability to swipe between the Home, Library, Playlists, and Playing tabs. This could be similar to the implementation of the standard/Google-play music app. The general idea of what I'm talking about is described here:
http://developer.android.com/design/bui ... /tabs.html
and also here:
http://developer.android.com/design/pat ... views.html
Second, I'd like to suggest implementing the bread crumb navigation paradigm across the whole app. Especially for navigating the library, I think this could be very useful. This is the related Android UI guideline:
http://developer.android.com/design/pat ... ation.html