title: Disable Home button in Android 4.0+
body: <p>I'm trying to replace the stock lock screen with my own app.<br>
  In my code, i want to disable the Home button.<br>
  I know how to do this in Android 2.3 and below,<br>
  but the same code doesn't work with Android 4.0+ (return to desktop when Home button pressed)<br>
  <br>
  Recently I found out an app called MiHome which has its own lock screen and is able to disable the Home button.<br>
  Does anyone know how it achieves this???<br></p>