Sliding in a layout for user input
<p>I have a ListView and each item contains a TextView displaying a number.  I'd like to give my users the ability to change this number while staying on the ListView (as opposed to drilling down into a detailed view by clicking on the list item).</p>

<p>What I'm looking to do is to slide in a layout from the bottom of the screen that covers about half of the screen.  I'd like this layout to be OVER the Activity behind it (as opposed to being part of that Activity's layout and simply showing it).  I'd also like it to be model (or seem modal).  Meaning the Activity behind it can not be focused and manipulated.  In this layout I will essentially create a calculator.</p>

<p>What I need help with right now is:
1) How to display a layout over the current Activity
2) How make the background (the Activity) modal</p>

<p>Could someone point me to some tutorials/resources and/or give me a few tips?</p>
