Figuring out which items are visible is pretty easy, you can use ListView.getFirstVisiblePosition() to know what section of your adapter is visible (getFirstVisiblePosition() + getChildCount() - 1 gives you the last visible position.)
On Sat, Apr 30, 2011 at 8:35 PM, Eric <[email protected]> wrote: > > > On Apr 30, 11:29 pm, Dianne Hackborn <[email protected]> wrote: > > I'm not sure what more to say except that this isn't how > > notifyDataSetChanged() is supposed to be used. It is for relatively > > infrequent, significant changes to the underlying data. The typical case > is > > when a new query has been done in a database and the adapter is being > > switched to show the data of the new cursor. > > Let me simplify this. Do you know of a Google example code you could > point me to that shows a ListView with many items updating itself, > without calling notifyDatasetChanged()? Where the items in the list > are updating in real time? > > How is my View code supposed to know which list items are visible? > Why should I be responsible for updating the cells if they aren't even > on the screen? I'd need a pointer to all of the ListView subviews. > Why isn't there simply a method on Adapter named, > notifyDatasetChangedAtIndexes(int[] indexes), so that the ListView can > be smart about merging the changes that I tell it about, with only the > cells that are currently visible? > > -- > 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 > -- 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
