Starting activity when screen goes on
<p>This is my scenario:</p>

<p>I need to start an activity when screen goes on, no problem, just it works slow(take a second at least).</p>

<p>So what I did is start the activity when screen goes of, and just wait till user turn his screen.</p>

<p>Now my problem is that the activity opens the lock screen, which is what I want, but it makes the unlock sound when screen goes of. Is there a possibility to cancel the sound? Or maybe make the activation when screen on work faster?</p>
