1. If you know the two components are running in the same process,
just follow the LocalService sample code to directly call between the
two.

2. You can create a PendingIntent to deliver a result to an activity.
That PendingIntent can be given to the service either as one of the
extras in the Intent given to startService().

3. You can use Messenger to perform message-based communication back
and forth between the service and activity.  Just create a Handler in
the Service, return the Messenger from it as the onBind() result, and
have the activity connect and send messages through the Messenger.
The activity can send back its own Messenger for the service to
deliver messages to it as needed.

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