Re: [android-developers] Is there a convention for the columns CalendarContract.EventsColumns.SYNC_DATA1 - SYNCDATA10?

Hi,

The SYNC_DATA* columns are reserved for the sync adapters to use.The
GoogleCalendarSyncAdapter can use it for any purpose and change the
usage whenever it wants. There's no standard convention. If you are
using a sync adapter, use it in any way to fit your needs.

> how can I make sure another application doesn't use the very same columns and they override each other?

There's no sure way. The CalendarProvider allows access to the
SYNC_DATA* columns only if the caller identifies itself as a sync
adapter. And in that case, they can only access rows that matches the
supplied ACCOUNT_NAME and an ACCOUNT_TYPE. This is to prevent
accidental access. It doesn't validate whether the caller is a sync
adapter or not.
http://developer.android.com/guide/topics/providers/calendar-provider.html#sync-adapter

Thanks,
Mike

On Mon, Nov 12, 2012 at 5:57 AM, Christopher Masser <cmasser@gmail.com> wrote:
> CalendarContract.EventsColumns.SYNC_DATA1 - SYNCDATA10 are said to be
> columns of the content provider for use with sync adapters. Does anybody
> know if there is some convention for what is the use of these columns? I've
> realized that on my device SYNC_DATA5 stores the date last modified and
> SYNC_DATA1 seems to store the Google event ID. So it seems whenever the
> Calendar app syncs with Google Calendar, these columns are modified.
>
> However, if I choose to use one of these columns for my sync adapter, how
> can I make sure another application doesn't use the very same columns and
> they override each other?
>
> If SYNC_DATA5 is ALWAYS used by Google Calendar to store the date last
> modified I would be fine with just using that for my sync logic, I just need
> to be certain that this is a convention.
>
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