LazyList 's listview can not refresh with new arraylist

I m trying to use searchView with LazyList. In my lazyAdapter I m updating my arraylist , this works smoothly but my listview doesn't update with arrayList. This is my filer method. I suppose notifyDataSetChanged does not work.Please help how can I refresh my listview?

public void filter(String charText) {

    charText = charText.toLowerCase(Locale.getDefault());
    //list.clear();
    list = new ArrayList<HashMap<String, String>>();
    if (charText.length() == 0) {
        list.addAll(arraylist);
    } 
    else 
    {
        for (HashMap<String, String> map : arraylist) 
        {
            if (map.get("radio").toString().toLowerCase(Locale.getDefault()).contains(charText)) 
            {
                list.add(map);
            }
        }
    }
    notifyDataSetChanged();
}

The variable list holds a different object after the third line. You are changing this new ArrayList but the adapter still remembers the old one. Instead of

list = new ArrayList<HashMap<String, String>>();

write

list.clear();

You then work with the same object as before.