How to implement a "hidden" Android app?
<p>I would like an application which is not readily apparent to casual perusal of the Android.   </p>

<p>How best to activate it and bring its screen to the fore? Can I detect a special dialing sequence, like <code>*1234#</code>? Or a hotkey combination?  </p>

<p>When activated, I guess I can pop up an anonymous screen which does not mention the app, but only asks for a password.</p>

<p>If password is ok, then show the app.</p>

<p>Any suggestions?</p>
