Android export vcard and android.pim class

I am looking for a built in method for converting contacts into a VCard string. I've found the classes VCardBuilder and VCardComposer which lives in the android.pim.vcard package. Eclipse is unable to find this package 开发者_如何学Cwhen importing and the official documentation makes no mention of them.

How can I import and use these classes? Or is the only option to write my own Vcard exporter?

Regards