How can I start the service without activating?

I want to start the Service without activating, ie without windows. This is not a virus, just a service for an alarm clock, as a supplement.

AlarmManager heard and did, but the point is not much what you think. This is a supplement for an alarm clock which in the file / data / data / package should overwrite the file.

Ie my main application with Activity, will launch apk add-on. In general, it is essentially not important. You can still tell whether it is possible in Android Studio to do so to start the service without activity.

Ie in the menu there is an application. By clicking on it, the process will start, but it will not be visible, that's how it is. without root !. I read something about Broadcast Boot there, I tried it ...