Here are some more details about the problem.
I am running Eclipse on a Mac.
Everything was ok, until I updated the SDK version (and ADT plugin) to
the sdk 2.2.
Now I can't use the emulator, or export .apk files for most of my pre Android-sdk-2.2 projects.
The error message contains something like: ".apk file not found".
When looking in the projects bin directory the .apk file isn't there.
How did that happen. I didn't delete them.
When I use the "android update project" on the command line I can generate a build.xml file.
However when I use ant debug to export or build the .apk file I get the following error message:
BUILD FAILED
/Applications/apps/android-sdk-mac_86/platforms/android-4/ant/ant_rules_r2.xml:220: null returned: 139
I have also tried to use the project clean option in Eclipse.
It looks like countless hours of work have been wasted.
Since I can't build the .apk file I can't move it to the emulator, or phone.
This wasn't a problem in the previous Android-SDK version.
Any solution?