How to show media controls on lock screen when playing music? I'm using a Nexus 4. When I play music from the Play music app, the full screen lock screen music controls or music art will not show, only the lock screen shows, as if I am not playing music at all.

I do have doubleTwist installed (wanted to try it) but I have the doubleTwist lock screen controls off.

How can I get lock screen controls back?
I had this problem - to resolve it, play a track with Google Play and lock your tablet. You should notice the new lock screen with album art is now present.

Now, quit Google Play etc. and go back to using (the excellent) doubleTwist. You should find doubleTwist's "now playing" track appears on the lock screen just like Google Play.

I suspect Google Play starts a background service enabling this new feature. Hopefully an update to doubleTwist will do the same in future - but I'm just guessing.