In a android application is a small bug with random music select.
1/Open Application
2/Change connection, example : online to offline
3/Select random music in "home" screen
Bug : Subsonic use a online music instead offline music.
For use this fonctionnality :
1/Open Application
2/Change connection, example : online to offline
3/Exit Application and Open Application
4/Select random music in "home" screen, it's work
the random music is offline 
PS: sorry for my english
