Regularly locking your phone’s screen can be an annoyance. So much so that a third of Android users don’t even lock their phones at all, and those that do choose painfully obvious PINs or patterns. Fortunately, there’s a better way: It’s called Smart Lock for Android.
Android (rooted): Some Android handsets support a “knock code” unlock feature — tapping on the screen in a certain pattern to gain access. An Xposed module can bring the same option to just about any rooted phone running Android 4.2 and above.