how to know User have entered wrong password or pattern? (android lock) [duplicate]

Question

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patterns unlock attempts by a BroadcastReceiver in android (1 answer)

Closed 8 years ago.

I want a service to look if user enters wrong pattern and number of that.
I Googled it, but got nothing useful. some say it's impossible, because it's for Android system and inaccessible, and there are some saying it's possible and they're talking about "PASSWORD_FAILED attempts" or something.
And I think it's completely possible, because there is an app when you enter a wrong pattern, it takes a picture with front camera.
Any help will be appreciated.

Answer 1

A device administrator can use the <watch-login /> policy to see this. It receives ACTION_PASSWORD_SUCCEEDED or ACTION_PASSWORD_FAILED each time, and it can use DevicePolicyManager#getCurrentFailedPasswordAttempts to query for it.

See Device Administration.