i didn't understand you, the adapter doesn't have a getView method El viernes, 1 de febrero de 2013 12:50:46 UTC+1, Kostya Vasilyev escribió: > > 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] <javascript:>> > >> 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]<javascript:> >> To unsubscribe from this group, send email to >> [email protected] <javascript:> >> 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] <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > >
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