title: create a custom lockscreen for android and access its camera
body: <p>Ok so, basically i have a project in mind. I am planning to make a custom lockscreen for android. i need to use the front camera to click a pic of a card, match it to a stored image and only then unlock the phone. Much like face unlock, but another pic instead of a face. could i get a few pointers on how to implement this? If not develop a separate lock screen/app, I don't mind editing the core java file of the LockScreen.java. Any pointers on how to develop this?
  Thanx, any help will be appreciated. :)</p>