Question

Is it possible to broadcast any message from any Service which is running in background so that any broadcast receiver from that app or any other app can receive the message?

Answer 1

The broadcastreceivers must have some filter and if your broadcast doesn’t set this filter your broadcast wouldn’t receive the broadcast.

So if you would like to send some message to all of your broadcastreceivers, then all of them should have the same filter properties, but then they are unnecessary.

See the documentation for further details.

When you use sendBroadcast(Intent) or related methods, normally any other application can receive these broadcasts. You can control who can receive such broadcasts through permissions described below.
-> http://developer.android.com/reference/android/content/BroadcastReceiver.html