I’ve been playing around with Android lately and I’ve run into a problem building UIs. More precisely, I’m pretty sure when I was building the first layout, the layout editor in Eclipse adjusted the visible area so when I added new widgets, it stretched in height to display them.
Now I have a problem that whenever the widgets fill the area, it’s impossible for me to properly lay them out since the preview window displays only the height of a single screen, even if it’s a simple LinearLayout with a bunch of textviews to fill about 2 screen heights.
Also, I’m using the latest stable Eclipse and ADT plugin, target platform is 2.2.
EDIT
What I meant was that the editor doesn’t display the elements that don’t fit inside a single screen height and clips the stuff (see the image to see how it clips, there are actually 2 more textviews that are clipped totally) which makes impossible to build UIs that are taller that a single screen height.

That’s normal there is a clipping occuring. I just tested it on my eclipse and I have the same behavior than you.
If what you want to achieve is creating a layout bigger than your screen size, you should use scroll views (and insert your initial layout in it):
Once in scroll mode, the layout will auto adjust.