I understand I can walk through all children, but this is very bad approach, very inefficient and takes a lot of CPU time. When you need to update several child views in the list several times a second this drastically impacts the peformance. I need to retrieve the child view quickly using some hash map or other quick and efficient way.
On May 23, 8:02 am, Kostya Vasilyev <[email protected]> wrote: > There are methods in ListView for getting the first/last visible row. I > think if you iterated just over these, it would be fast enough. > > 23.05.2010 14:59 пользователь "ls02" <[email protected]> написал: > > I need to frequently update listview row, What's the best way to find > the row? I wonder how findViewById and findViewByTag work? Do they > walk over all child views and check each view ID or tag? Because this > could be very inefficient. Or they have some sort of hash map to > quickly retrieve the requested view by ID or tag? > > Or maybe there is another way of updating listview items? I know > listview reuses views and as you scroll they essentially hand adapter > the same views in getView method. > > -- > 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]<android-developers%[email protected]> > For more options, visit this group > athttp://groups.google.com/group/android-developers?hl=en > > -- > 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 > athttp://groups.google.com/group/android-developers?hl=en -- 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
