ClassCastException with ListView when executing notifyDataSetChanged

Question

I have added a view to the header of listVivew,

    View TopSearch =  (View) View.inflate(this, R.layout.search, null);
    lv.addHeaderView(TopSearch, null, false);

And everything is fine until I try to execute (when data changes)

adapter.notifyDataSetChanged();

That always crash my application giving me following error:

> java.lang.ClassCastException: android.widget.HeaderViewListAdapter

If I remove header view then there is no error. Any suggestions? Thanks.

Solution 1

It seems that whenever you use header/footer views in a listview, your ListView gets wrapped with a HeaderViewListAdapter. You can fix this using the below code:

((YourAdapter)((HeaderViewListAdapter)lv.getAdapter()).getWrappedAdapter()).notifyDataSetChanged();

Solution 2

API 18 and lower is confused about what it is wrapping. To help it, set your header and/or footer PRIOR to assigning the adapter. That way the correct wrapping takes place under the covers. Then remove the header/footer immediately after (if that is what you want).

myList.addFooterView(myFooterView);
myList.setAdapter(adapter);
myList.removeFooterView(myFooterView);

Solution 3

As written in http://stanllysong.blogspot.ru/2013/08/javalangclasscastexception.html it should be done so:

HeaderViewListAdapter hlva = (HeaderViewListAdapter)l.getAdapter();
YourListAdapter postAdapter = (YourListAdapter) hlva.getWrappedAdapter();
postAdapter.notifyDataSetChanged();