Is it possible to handle the screen unlock event?

Question

Java

For example, so that immediately after unlocking the screen, the application starts in the background?

Answer 1

no such scenario

Answer 2

In general, you can use the USER_PRESENT broadcast. But there are many pitfalls, for example, custom launchers cannot generate it.
It is more likely that you have problems with the application script.

Answer 3

For the application to work in the background, there is a Service
Class android.app.Service