added support for FOCUSCHANGE AUDIOFOCUS_GAIN auto playback

Change-Id: Idf4feeb2db5eb3a11b90054575a21997d372532b
play the song from the VIEW-intent

Change-Id: Id30fbf2a2f6b39b951958f9feac4fd47bd5789da
small fixes

Change-Id: Iced205cc6b5d529ec9c30035bcbb3e300e19075a
small fixes

Change-Id: Ie1868077201f87a510a7238e2c9fb71b489d5335
mFileToPlay and mPausedPosition for post AUDIOFOCUS continue

Change-Id: I40f79869d92717c7ba615b7fc2c959aaa8ef959e
preventing npe during sudden power loss

Change-Id: I9388ca62e0cd2da6d8fb734888ae9b11cd19d294
preventing more npe's during sudden power loss

Change-Id: I7cd8d88eb1ed9277fe2aaff6b2f39b5a6c5770d9