How to detect is the screen phone is locked?

Problem:

Sometimes is necesary to detect if the screen phone is locked or not. There is a couple of ways to detect that but the best way is the following...

Solution:

Implement the following method and check if return true (locked) or false (unlocked)

Context context = getApplicationContext();

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