After adding each item to listItems I do a notifyDataSetChanged() on the
adapter.
Why you call adter adding each time.
public void updateListItems(){
// TODO clear list
// TODO Add element to list
// TODO NOTIFY DATA SET CHANGED
// TODO try to get list item size (I do not know why you need it)
}
P.S Sure you created adapter with this list and adapter set to list.
On Friday, May 16, 2014 11:58:17 PM UTC+5, plnelson wrote:
>
> I have a listView in an android app which works fine when I first populate
> it - it displays and scrolls with no problem. But if I load in a new,
> smaller dataset and call notifyDataSetChanged() the app crashes because
> getView() gets called with a position value that's bigger than the dataset,
> i.e., if listItems.size==6, valid values for position should be [0]-[5] but
> getView() is called with 6, so I'm getting index out of bounds when I try
> to access an item in my list. While investigating this I noticed that*
> ListView's getCount() is still returning the old value of 12.*
>
> Details:
>
> ...In MyListActivity, which is a ListActivity . . .
>
> public static ListView lv; // my ListView in the code
>
> ... during onCreate() . . .
>
> setContentView(R.layout.mylist);
> lv = getListView();
>
> create the adapter and bind it . . .
>
> mylistadapter = new MyListAdapter(MyListActivity.this);
> setListAdapter(mylistadapter); // bind the adapter
>
> ...the data source is an ArrayList called listItems. The first time around
> it has 12 items in it; later I clear it and add in 6 items. (see below)
>
> public static ArrayList<String>listItems=new ArrayList<String>();
>
> ... in my adapter, which is a BaseAdapter, my override of getCount() looks
> like this. After shrinking listItems to 6 it correctly returns 6.
>
> @Override
> public int getCount() {
> return listItems.size();
> }
>
> ... To shrink my dataset to 6 I first do a
>
> listItems.clear();
> lv.invalidate(); // my (failed) attempt to get lv to reset its count
>
> ... and then add in the 6 new items. After adding each item to listItems I
> do a notifyDataSetChanged() on the adapter. What I've noticed is that if*
> I do an lv.getCount it returns 12, i.e., the value it was before doing the
> listItems.clear()* and invalidate(). Why does the ListView still think
> it's 12? How do I reset it? Is that why the adapter thinks it's too big?
>
>
>
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