[android help] Is there an onBackPressed() alternative for a service?

Is there an onBackPressed() alternative for a service?

I know that services cannot implement Back key press and I understand the rationale. But there is an app called SideBar (on Play Store) that reacts to back key presses. It is a service that adds a view as system overlay and removes the view when the back key is pressed. Can anybody explain how this is done?

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