If anyone has the same problem: I found a way to do it now. I had to
build my own gallery but it wasn't as hard as I feared it would be
since I found this excellent tutorial:
http://blogs.sonyericsson.com/developerworld/2010/05/26/android-one-finger-zoom-tutorial-part-2/
The best thing about it is that you can download and use the whole
source code which implements a robust framework for zooming and
panning. They only use one finger for zooming and you have to switch
between zooming and panning functionality via the options menu which
is kind of cumbersome but it's easy to change it to pinch zooming with
the help of another great tutorial:
http://www.zdnet.com/blog/burnette/how-to-use-multi-touch-in-android-2/1747
After that, adding support for multiple images isn't very hard either.

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