Missing AndroidManifest.xml when importing an old Android project into Eclipse
A simple solution is to either reimport the AndroidManifest.xml file or make a change to the file and save it. This worked for me.
If you see an error about AndroidManifest.xml, or some problems related to an Android zip file, right click on the project and select Android Tools > Fix Project Properties. (The project is looking in the wrong location for the library file, this will fix it for you.)
from: http://developer.android.com/resources/tutorials/notepad/notepad-ex1.html