Extending a Contacts Manager

Hello everyone!

Before you continue reading please keep in mind that I am a complete newbie in Android development. My related experience is in Java programming and in the Eclipse IDE, so please be mild in your criticism.

To the point now, I want to develop an application which extends a contacts manager. I have an Eclipse Juno environment fully setup for Android development, tested and working. I figured that I should use as much as I can from code that already exists from the Android Open Source project (found at GItHub: github.com/android/platform_packages_apps_contacts/tree/jb-release). I then create a "new Android project from existing source code" in Eclipse. Unfortunately the project that I get is full of errors, all references to classes that do not exist. Obviously things that are needed haven't been imported. Any idea why this is happening and how to resolve it?

Thanks in advance.