How to extend the calendar on Android?

Question

I mean, is there a way

• add extra functionality
• add / remove events
• sync with other Google calendars / formats (authorized)

Answer 1

A content provider is available for calendar entries: android.provider.Calendar.CONTENT_URI( see brief documentation here ).

Although, I would consider using the Google Calendar Data API . You should be able to authenticate the user using AccountManager # getAuthToken and edit calendar entries in very rich and well-documented ways.