Detecting when screen is locked

by

There is a better way:

KeyguardManager myKM = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
if( myKM.inKeyguardRestrictedInputMode()) {
 //it is locked
} else {
 //it is not locked
}

No need for broadcastRecievers, permissions or anything similar.

Note: It doesn’t work when user has set his/her screen lock to none
in settings–>security–>screenlock–>none

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