Can I add an external app inside the app and inside the View?

Hello, everyone I was just checking, and I have a question.

There is an application called car mode made by Samsung in Google Store If you run this application, and you run any app in it.

The application is running.

It feels like an external app is running in the view, not in the form of start activity (The reason is that the app runs while saving the space while the bottom bar is alive in the app.)

How do I implement this? It feels like putting acitvity in the view I designated?

If possible, cast and insert the activities that are executed in the form of a view Put the activity in the fragment and control the fragment... (Literally, if possible.))

It's not easy to access.

I'd appreciate it if you could at least tell me the keyword.

I google this and that There are only a lot of external apps running.

I was wondering if there's a keyword that I don't know.

ps (It's not a form of drawing on top of the app) - the app runs without permission.