Is it possible to lock screen on android?

Question

Android

Hello.
Please tell me, is it possible to lock the screen on android from your application? (not turning off the screen, namely locking with a password that my application will install).
If possible, I would like to see a sample code
Thanks in advance

Answer 1

Such applications will qualify as Locker and be added to anti-virus databases + it will not be allowed in Google Play.
Why do you need this?

Answer 2

Device administrators can do this. For example, in Kaspersky antivirus, the anti-theft function blocks the screen (and this was added to the playmarket, if anything) and can reset the password set on the phone (and generally disable the need to enter a password, fingerprints, face recognition, etc.)

Answer 3

great without root ─ constantly in the background, see if your application is running, if not, start it.