lv.setOnItemClickListener(new OnItemClickListener() {
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Toast.makeText(ShoppingListApp02Activity.this, "List item selected:" +
    items.get(position).getId(), Toast.LENGTH_LONG).show();
    }
});

public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
    menu.add(0, v.getId(), 0, "Something");
    menu.add(0, v.getId(), 0, "Something else");
}

lv.setOnItemLongClickListener(new OnItemLongClickListener() {
   @Override
   public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2,
       long arg3) {
        // TODO Auto-generated method stub

        return false;
   }
});

convertView.setOnLongClickListener(new OnLongClickListener() {

            @Override
            public boolean onLongClick(View v) {
                ((Activity)mContext).openContextMenu(v);
                return true;
            }
        });

registerForContextMenu(YOUR LIST-VIEW OBJECT);

public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
    menu.add(0, v.getId(), 0, "Something");
    menu.add(0, v.getId(), 0, "Something else");
}