When music player switchs a song, multiple notifications(around 5 in my
test) are sent to NotificationListner, during this,
MediaControllerCompat does not always get the music info we need, the
music info and state seem randomly combined previous song and current
one.
To avoid unnecessary music info updates, debounce
onSetMusicInfo/onSetMusicState calls, so only the last music info and
state are sent to the device.
When receive SMS message, instead of generating multiple notifications
by PDU size, after this change, there will be only one notification for
each sender.
It seems WeChat always mark its notifications as LocalOnly. The reason
may be to avoid double notifications when using Android Wear watches,
since WeChat has a standalone Android Wear app.
Do not ignore WeChat notifications even if they're marked as LocalOnly.
Zhong Jianxin
