如何在Android上检测屏幕固定的锁定和解锁

Question

I am working on an android app that should be used by students in some kind of practical test. I am using the screen pinning that was introduced in Lollipop ( startLockTask() ), so when my app is launched the user needs to allow the locking.

I couldn't find a way to know when the user click ok for the locking and when he unlock the pinning? (The user can cancel the lock by holding both the Back and Recent buttons). I am not looking for a way to know if the user currently in lock screen (getLockTaskModeState ()), i want to know if i have a way to handle the events of locking or unlocking.

I want that in the begining of the test i will be able to send information to my server if the users 'logged in' properly (by allowing the lock), and as well if the user unlock the device before the end of the test.

EDIT

Hey, people! Please explain yourselves after downvoting! If I wasn't exaplaining myself - i will try again if you will let me know. I read a lot of questions and answers about general lock screen, but not the one of app pinning, I also read about check the status of the current task- if it is locked or not, but i didn't find answer to what i am asking - is there a way to handle the event of unlocking the 'screen pinning' of a specific app. So please, explain your downvotes!

Answer 1

Device Admin Recevier class give you the event of pinning and unpinning... However the example use the class when the installed app is provisioned for device owner.. Not sure if you could use it. You may refer to this too : How to be notified when screen pinning is turned off in Android 5.0 Lollipop?

Answer 2

https://developer.android.com/reference/android/app/ActivityManager.html#getLockTaskModeState()

Just use the function as stated in the link.