arg... you didn't understand me or i can't understand you
getChildView and getGroupView are from the ExpandableListView, but we are
talking about the Adapter,
i dont know how to update only the view of only the two childs i want to
update, please, can you give me code example of what you want to say to me?
i can't understand
El viernes, 1 de febrero de 2013 13:08:36 UTC+1, Kostya Vasilyev escribió:
>
> Urm, for an expandable list view -- getChildView or getGroupView.
>
> -- K
>
> 2013/2/1 saex <elpab...@gmail.com <javascript:>>
>
>> 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 <elpab...@gmail.com>
>>>
>>> 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.**getFirstVisib**lePosition();
>>>>> final int nLast = mAccountListView.**getLastVisibl**ePosition();
>>>>> for (int position = nFirst; position <= nLast; ++position) {
>>>>>
>>>>> View itemView = mAccountListView.getChildAt(**po**sition - 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 <elpab...@gmail.com>
>>>>>
>>>>> 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 <elpab...@gmail.com>
>>>>>>>
>>>>>>>> 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
>>>>>>>>
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