Question

Is it possible that BroadcastReceiver in an activity which have gone to background receiving broadcast? If not, what should I do?

EDIT:

Let me clarify what I really need.
I have a service that will receive data from bluetooth.
When it get data from blue-tooth device successfully, the service will broadcast.

And there are three cases of the activity.

1. foreground

Popup a dialog and ask for user something
I think it can be simply done by register receiver in activity

1. background

I just don’t know how to do this part.
If I register the receiver in application, notification is shown. After taking a look of the answers below, I think I can register in Application.

1. sleep
   Wake up the device.

Thank You.

Answer 1

You probably don’t even want that. Activities are not designed to be used that way.

You should use a service to handle it. Or start an Activity if it needs to have an UI.

There two alternatives the way I see it.

1. Have a service running and register the receiver there instead.
2. If possible you can register the broadcast receiver in the manifest instead and handle it there.
   Please keep in mind that the receiver will run on the main thread, so you should signal to a running service or start a service or activity here. Perhaps a service that performs a single task.

A service that performs a single task can easily be implemented using IntentService. It is kind of like an async task wrapped in a service.