music stops after switching back about a2dp-connect HOT 1 CLOSED

Stopping the music player on Bluetooth disconnect is part of Android.  This 
widget has nothing to do with that.  You could however but some code in there 
when disconnecting that you toggle the play command back to Android.  This is 
not a feature most would like though so I don't plan to integrate that in here. 
 The reason Android does stop the music is because that is the desired behavior 
for the vast majority of use cases.  

Feel free to clone the source and extend it to do that you want.  You can look 
at my A2DP Volume app to see how to send the resume command.  Take a look 
around line 733 here: 
http://code.google.com/p/a2dpvolume/source/browse/src/a2dp/Vol/service.java
It shows sending a broadcast intent to Android.