Build Contacts Application using Android SDK

I am trying to build default Contacts application from Source code using Android SDK (i.e. Eclipse & ADT) as I wanted to add some more options into contact details (which are specific to my requir开发者_开发百科ement). But it's giving me some compilation errors as android.jar is not having all the classes required to build this application. Please tell me how can I achieve this.

Thanks, Parag

You cannot build the "default Contacts application from Source code using Android SDK". You can only build that app as part of a complete custom firmware build.