[android-developers] Re: Is it worth writing a ContentProvider and using CursorAdapter for this case?

IOW, the OP most likely should not be using ArrayAdapter at all, but
relying on CursorAdapter talking directly to the ListView; it really
is tailor-made for this situation. ArrayAdapter is really meant for a
different situation: when you have a (static) array containing the
data to be displayed.

Cursors, ContentResolvers and ContentProviders are discussed together
so often, it is easy to forget that -- just as Dianne said --
CursorAdapter does not actually depend on a ContentProvider. Nor does
Cursor itself.

On Sep 21, 9:37 am, Dianne Hackborn <hack...@android.com> wrote:
> What you are doing is potentially really inefficient.  Improving it is not
> really a matter of using a content provider, but using an adapter that
> doesn't require you load all of the data up-front.  Adapters are designed to
> be able to load data on demand as needed, which CursorAdapter does.
>
> Also not that as far as I know CursorAdapter doesn't have a dependency on
> there being a content provider.  It just wants a Cursor, which you can get
> from any SQLite database.
>
>
>
> On Tue, Sep 14, 2010 at 2:21 AM, Samuh <samuh.va...@gmail.com> wrote:
> > We are connecting to a number of WebServices and fetching a lot of
> > structured data(XML). We are parsing this data and storing them into
> > SQLite tables. This part of the application runs periodically in the
> > back ground.
>
> > On the foreground, the data fetched is displayed in ListViews. We have
> > used ArrayAdapter to back these lists up. The thing is, every time the
> > Actvity starts or data set is refreshed, we have to load the
> > ArrayLists by querying the database and call notifyDataSetChanged() on
> > the Adapter.
> > This slows down the application and affects the User experience.
>
> > Question:
> > 1. I'd imagine using a CursorAdapter might result in performance gain,
> > since the framework will take care of managing the cursor. Is this
> > assumption valid?
> > 2. Will the CursorAdapter take care of reflecting updates to the
> > database on the screen automatically?
> > 3. Will I have to write a ContentProvider if I choose to use
> > CursorAdapters?
> > 4. Are there any other considerations that we need to make?
>
> > Please help.
>
> > Thanks.
>
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> --
> Dianne Hackborn
> Android framework engineer
> hack...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails.  All such
> questions should be posted on public forums, where I and others can see and
> answer them.

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