MIDlet device availability events are sent through the javax.microedition.media.PlayerListener interface.
The device sends the DEVICE_UNAVAILABLE state event to
the registered PlayerListeners when a player becomes
unavailable, and DEVICE_AVAILABLE state event when the
device is again available. The player will be in the realized state when it
becomes available, so the MIDlet will not need to call the realize method
before restarting the sound.
Note: When a voice call interrupts the MMAPI MIDlet use, Series 40 devices
send the DEVICE_UNAVAILABLE event. In S60 3rd Edition
and later, when there is incoming call, all the players in STARTED state are
stopped (they go to PREFETCHED state). The PlayerListener is
also notified with the PlayerListener.STOPPED event. Players
are not automatically restarted when call ends.