data & synchronization - manually sync mail. calender and contacts

Question

I am trying to write an app that syncs my mail and my calender with just a single click. After looking through this forum I found some good hints and wrote a short test app

Answer 1

OK, it seems the the Authority for contacts is:

"com.android.contacts"

and for calander:

"com.android.calendar"

But I could not find the String for syncing Gmail...