title: Android - detect phone unlock event, not screen on
body: <p>Is there a way to detect when a user unlocks the phone? I know about <code>ACTION_SCREEN_ON</code> and <code>ACTION_SCREEN_OFF</code>, but these seem to be fired when the screen switches on/off when pressing the power button, but not actually when the phone gets unlocked when pressing the Menu button...</p>
  
  <p>I am trying to detect the unlock/lock while an activity is running, and I want to resume the activity once unlocked.</p>