Android BroadcastReceiver without intent filters

Question

I saw in few android ad networks sdks that they are declaring BroadcastReceiver with no intent filters. Something like this:

Answer 1

I think that the following question/answer should give you some clues:

Create an IntentFilter in android that matches ALL intents

Answer 2

If you do not have some intent filters, the only way to receive something is to call the receiver explicitly. This would look like this:

context.sendBroadcast(new Intent(context, MyBroadcastReceiverClass.class));

Another guy already answered this question in the following post: https://stackoverflow.com/questions/10051256/broadcast-receiver-not-receiving