Maybe related, maybe not... I use a CursorAdapter to update a list - whenever the list refreshes (due to the database changing) the 'onBindView()' for a given position always seems to deliver me a *different* view from the one that originally contained the list item. So, during the update at least some of the list-items are actually re-ordered and re-drawn. (Just as you describe above)
The reason I found out about this behavior was because I was (incorrectly) only overriding the 'onNewView()' method - making the assumption that once the view was created its content would remain fairly static. This was causing all sorts of fun and games with the UI. Now that I follow "The Rules" and faithfully fill in whichever view I am handed in the onBindView() (rather than try to second guess the platform) everything is sweet. Doug On Jun 26, 3:48 pm, Peter <[email protected]> wrote: > On Jun 26, 5:59 pm, Mark Murphy <[email protected]> wrote: > > > Peter wrote: > > > Sorry. I'm making the mistake of hoping people identify the problem > > > based on not very much information, partially because I'm lazy, I > > > guess. > > > I may also simply be a bit thick. > > > > Row 0 in the ListView contains an ImageView. Initially, all rows have > > > a placeholder image. The thread updates row 0's ImageView > > > "The thread"? > > Well, the thread sends a message to a Handler. Incidentally, the > Handler is what kicks off the icon-grabbing thread as well. I am using > a similar pattern to this:http://tinyurl.com/p5hlxz(Android source > link). > > > > > That better be "the UI thread". Anything else should blow up and would > > be unreliable if it somehow doesn't blow up. Always update your UI via > > the UI thread. > > > So, for example, if you use AsyncTask for your data fetch and UI update, > > you would do the HTTP operations in doInBackground() and update the list > > in onPostExecute(). > > I am doing the equivalent of that, as far as I can tell. > > > > > > and I see > > > the image updated on the screen. A split-second later, row 5's image > > > is the same as row 0. So now, 0 has the new image, 1-4 still have the > > > placeholder, and 5 shows the image associated with row 0. > > > That is pretty strange. > > > Have you either used Eclipse breakpoints or Log statements to see when > > getView() is called? In the pattern you're describing here, how many > > times is it called? > > > -- > > Mark Murphy (a Commons > > Guy)http://commonsware.com|http://twitter.com/commonsguy > > > Android Development Wiki:http://wiki.andmob.org > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
