Is that it? >>
You could call the adapter's getView, making sure to pass the existing view as the "convertView". << -- K 2013/2/1 saex <[email protected]> > i know how to get the views, the problems is that i can't reach the way to > tell the adapter to update the content of only these views... did you know? > > thanks > > El viernes, 1 de febrero de 2013 12:37:51 UTC+1, Kostya Vasilyev escribió: >> >> Might look something like this: >> >> final int nFirst = mAccountListView.**getFirstVisiblePosition(); >> final int nLast = mAccountListView.**getLastVisiblePosition(); >> for (int position = nFirst; position <= nLast; ++position) { >> >> View itemView = mAccountListView.getChildAt(**position - nFirst); >> >> As for asking the adapter to update the view, well, there isn't a direct >> way to do this. You could call the adapter's getView, making sure to pass >> the existing view as the "convertView". >> >> Or just "reach into" the content of your item layout (findViewById, >> ViewHolder) and update the values. >> >> If the number of items in the adapter can change dynamically, it gets >> more complicated, as the list view can be out of sync with the adapter. >> >> And remember, this can be considered an ugly hack that violates the holy >> principles of Objectively Orientated Progammation (or whatever that thing >> is called) :) -- but can be useful where performance is important. >> >> -- K >> >> 2013/2/1 saex <[email protected]> >> >> OK, i can get the childs View with: >>> >>> el.getChildAt(1); >>> el.getChildAt(2); >>> >>> but... what shouild i do to notify these views that they must reload >>> their content from the adapter? >>> >>> El viernes, 1 de febrero de 2013 11:38:42 UTC+1, Kostya Vasilyev >>> escribió: >>>> >>>> While TreKing's advice to profile is of course excellent... >>>> >>>> ...rebuilding the entire {expandable} list view just to update one item >>>> is more work that necessary. >>>> >>>> When performance is important, you can walk the list of visible item >>>> views, find the one you need to update, and do it right there. You will >>>> want to use listView.getFirstVisibleItem / getLastVisibleItem / getChild. >>>> >>>> Also there is a callback, AbsListView.onScrollListener, which lets you >>>> know when the list view is scrolling, and perhaps suspend your updates if >>>> necessary. >>>> >>>> -- K >>>> >>>> 2013/2/1 saex <[email protected]> >>>> >>>>> I have a ExpandableListView with some groups, and each group haves >>>>> only one child, with a string on it. >>>>> >>>>> I have a thread that get's some updated data and *each second* calls >>>>> a handler that updates the string of one of the childs of the >>>>> ExpandableListView and then calls this method to refresh the view and show >>>>> the updated data to the user: ((BaseExpandableListAdapter) mAdapter).* >>>>> *notifyDataSetChanged**(); >>>>> >>>>> This is the update handler: >>>>> >>>>> infoUpdateHandler = new Handler(){ >>>>> @Override >>>>> public void handleMessage(Message msg) { >>>>> super.handleMessage(msg); >>>>> children[2][0]=getUpdatedInfo(****); >>>>> ((BaseExpandableListAdapter) >>>>> mAdapter).notifyDataSetChanged****(); >>>>> } >>>>> }; >>>>> >>>>> The problem is that when i'm scrolling the expandable list view, i can >>>>> see how the scroll is showing low performance, it stops sometimes. I think >>>>> that it is because this call ((BaseExpandableListAdapter) mAdapter).** >>>>> notifyDataSetChanged**(); is updating all the ExpandableListView. >>>>> >>>>> *Does not exist a better way to update a expandable list view? Maybe >>>>> a way to update only the child that you want to update?* >>>>> >>>>> Thanks >>>>> >>>>> -- >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Android Developers" group. >>>>> To post to this group, send email to android-d...@**googlegroups.com >>>>> >>>>> To unsubscribe from this group, send email to >>>>> android-developers+**unsubscribe**@googlegroups.com >>>>> For more options, visit this group at >>>>> http://groups.google.com/**group**/android-developers?hl=en<http://groups.google.com/group/android-developers?hl=en> >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Android Developers" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to android-developers+**unsubscribe**@googlegroups.com. >>>>> For more options, visit >>>>> https://groups.google.com/**grou**ps/opt_out<https://groups.google.com/groups/opt_out> >>>>> . >>>>> >>>>> >>>>> >>>> >>>> -- >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Android Developers" group. >>> To post to this group, send email to android-d...@**googlegroups.com >>> To unsubscribe from this group, send email to >>> android-developers+**[email protected] >>> For more options, visit this group at >>> http://groups.google.com/**group/android-developers?hl=en<http://groups.google.com/group/android-developers?hl=en> >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Android Developers" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to android-developers+**[email protected]. >>> For more options, visit >>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out> >>> . >>> >>> >>> >> >> -- > -- > 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 > --- > You received this message because you are subscribed to the Google Groups > "Android Developers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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