> We can't really do that. Many of the screens in the app show market > depth, and the depth changes update-by-update. You need to redraw the > entire list every time.
ListView is not designed to support setAdapter() being called with that frequency. If that is how you "redraw the entire list every time", I would not expect good results. You may even wind up allocating memory faster than the garbage collector can free it, causing you to eventually run out of heap space. If, however, when the data updates come in, you are walking the current child Views of the ListView (i.e., the visible rows) and tweaking their contents, that should be OK. When the user scrolls, you'll be binding the then-latest data to the recycled rows as they roll onto the screen, then updating from there afterwards. You may still run into problems with flings being slow, but I don't know how long your list is. On Fri, Apr 29, 2011 at 8:20 PM, Eric <[email protected]> wrote: > On Apr 29, 3:37 pm, Dianne Hackborn <[email protected]> wrote: >> but you don't want to tell the list view that your data set has changed >> because >> then it needs to throw all of its current views away, retrieve the new data, >> and bind that data to new views. > > I thought the views get recycled? Isn't that what the convertView > argument is in the ListAdapter? If you are replacing the adapter, the old views get flushed completely. They have to be. There is no assumption that the views from Adapter instance #1 are remotely relevant for Adapter instance #2. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy Android Training...At Your Office: http://commonsware.com/training -- 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
