The simplest way to create signed/unsigned APKs using Eclipse and ADT is as follows:
- Right click your project in the "Project Explorer"
- Hover over "Android Tools"
- Select either "Export Signed Application Package" or "Export
Unsigned Application Package"
Select the location for the new APK file and click "Save".
- NOTE: If you're trying to build a APK for beta distribution, you'll
probably need to create a signed package, which requires a
keystore. If you follow the "Signed Application" process in Eclipse
ADT it will guide you through the process of creating a new keystore.
Hope this helps.