How do I determine Android Screen Width/Height?

Hello,
I've done a Google Search for finding the screen size in Android, but only found Java code(which I can't use).
The closest thing I found was:
maxwidth=stage.stageWidth;
maxheight=stage.stageHeight;
And they seemed reasonable, however when I drew an object at maxwidth on my HTC Sensation, it only drew in about the middle of the screen.
So I am very confused. A person simply cannot write Aps for Android unless they can get screen size because everyone's phone is different.
Any help?

I don't need an answer very fast because I can still develop for my own resolution and tweak later once I get this code.
I do have a game you can play for free here:
http://www.goodnewsjim.com/DiamondDrop/HowToPlay.html
Which I ported to Android.
But no one can play it because everyone has different resolution phones
Someday, I'll have an ap on the Market

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