ContentObserver should call if and only if ContactsContract.Contacts.CONTENT_URI changes
问题 As my application uses content from android.provider.ContactsContract.Data (API > 11) and ContactsContract.Contacts.CONTENT_URI (API < 11) to populate Contacts . I've tried to registerContentObserver() against these provider. But it calls my ContentObserver even if I tries to Call a person from device as soon as I put the call. It does trigger my ContentObserver which is not useful for me as there's no Content Change in Contacts Provider . Root Cause: Seems like LAST_TIME_CONTACTED or