KnockOn brings tap to wake gestures to Androids with AMOLEDs

You know those super useful tap to wake gestures you get on handsets from HTC, LG, and OnePlus? Now you can get them on almost any Android with an AMOLED display, thanks to a new app called KnockOn. Just like the tap to wake gestures on the handsets mentioned above, KnockOn lets you tap twice on