Android : Android Tab Child Activity notifyDataSetChanged() is not working

Android Tab child activity notifyDataSetChanged() is not working.I am trying to delete an item from listview using contextmenu list onItemClick(). Item is deleted but the view not updated. Here is my code.

     @Override
    public boolean onContextItemSelected(MenuItem item) {

        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item
                .getMenuInfo();
        String number;

        try {

            if (item.getTitle() == "Delete") {

                DataBaseHandler db = new DataBaseHandler(MyShoppingCart.this);

                db.deleteContact(listItems.get(info.position).getOrderNow());
                Toast.makeText(MyShoppingCart.this.getParent(),
                        "" + info.position, Toast.LENGTH_LONG).show();
                listView.removeViewAt(info.position);
                ListAdapter.listItems.remove(info.position);//Adapter list item delete 

                adapter.notifyDataSetChanged();



            }

            else {
                return false;
            }
            return true;
        } catch (Exception e) {
            return true;
        }
    }

}