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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