Android app with more than one package

As a newbie in Android development, I want to learn to run an android app from Eclipse if different java files combined have more than one package.

For ex. I was following this SQLite Database Tutorial here . You can find all the source code here(java files, manifest, strings, etc.). I have seen many websites but could not find an apt answer. I would be thankful if you can tell the concept in this case i.e. do we have to make 2 packages or the app can be run with one package only and which java file should go in which package?