How is a transparent status bar made in android studio, such as it is done in google maps?

Question

Android

In addition to maps, it is also used in many applications where the picture is visible under the status bar

Answer 1

Found only how to hide .-. But there are suspicions that this spy resource still has some for transparency, no? And if not, then there is a suspicion that this is set by the OS, and not by the application developer. But I can be wrong. https://developer.android.com/training/system-ui/s...
UPD: Ah, here it seems, on the topic https://developer.android.com/training/system-ui/d...
UPD2: Well, this is also https://developer.android.com/training/material/th...