I am moving an iPhone app to Android, where the iPhone app displayed
updated stock quote values continuously. I used background timers that
polled stock quote values and published them as events to all active
controllers. So I need some design suggestions:

  * Should I use local services for background polling task? As, this
service needs to be continuously running so I assume it should be non-
sticky service.
  * What is best way to publish events? Should I use
NotificationManager or Broadcast receivers?
  * I would like the service to be started when the app starts and run
as long as the app is running. Is there a way to declare this in
AndroidManifest.xml as the examples of local service seem to start the
service from activity.
  * Also, there is no direct interaction between activities and
services other than events.

Thanks in advance.

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