How to reveal that screen is locked?

Question

In my application I need to know when device is locked (on HTC\'s it looks like short press on \"power\" button). So the question is: which event is triggered when device is

Answer 1

In addition to the above answer, in-case you want to trigger some action when your app is at the foreground:

You could use the event called onResume() to trigger your own function when your app takes the spotlight from a previously resting state, i.e, if your app was at the background(paused/minimized...)

protected void onResume()
{
    super.onResume();

    //call user-defined function here
}