SimpleCursorAdapter already does the convertView optimization for you. Just avoid allocations in setViewValue().
On Wed, Apr 8, 2009 at 12:00 PM, DavidG <[email protected]> wrote: > > In my application, I have a ListView with a SimpleCursorAdapter, and > using setViewBinder to format each row of data accordingly. It works, > but I noticed while debugging that as I scroll up and down my list, > the binder's setViewValue() function is called for each row as it is > shown on the screen, and basically reformats the rows over and over > again as long as I scroll up and down. So if I have 20 items in my > list, setViewValue() is called 20 times as I scroll from top to > bottom. If I scroll back up, its called again as each row is shown. If > I sit there and just keep scrolling my list, a lot of garbage > collection happens as a result. > > I'm looking for ways to optimize this to hopefully reduce the need to > re-format each row as it is displayed. If it's already been formatted > with setViewValue(), is there a way I can skip doing it again as I > scroll back up? Am I missing something here? > > I came across a comment from Romain Guy on a "Fancy ListViews" > tutorial (http://androidguys.com/?p=635) regarding the use of > convertView which sounds like it would optimize things. Unfortunately, > I can't find a way to apply the logic to my application using the > SimpleCursorAdapter. > > Am I on the right track? Or is this "good enough" to accept the > frequent setViewValue() calls when scrolling? I'm still leaning, but > I'd like to at least learn the right way from the start! > > > > -- Romain Guy Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
