Screen lock for android. Are there any custom locking libraries other than those in the SDK?

Question

Android

Tasks:
1) Blocking a mobile device for a user-specified time
2) User selection of the "lock" hold time for urgent unlocking
I would be glad for any information on the topic of blocking.

Answer 1

Why do you need libraries? You can do it yourself.
1) lock, wait, wake
2) make your own lock screen
Example