How do I use unregisterReceiver

Hi,
Im trying to use Unity in android app.
When I finish unity-activity, log says

Activity has leaked IntentReceiver com.unity3d.player.UnityPlayer$17@41866de0 that was originally registered here. Are you missing a call to unregisterReceiver()?

As I don’t know receiver name, I can’t use unregisterReceiver().
How I can use unregisterReceiver() or solve that error?

I finally found an answer to this… just follow the stackoverflow link above and read my answer!