mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    
    @Override
    public void onItemSelected(AdapterView parent, View view, int position, long id) 
    { 
        // An item was selected. You can retrieve the selected item using
        // parent.getItemAtPosition(pos)
    }

    @Override
    public void onNothingSelected(AdapterView parent) 
    { 
        // If an option is removed then what to do
        // or anything else
    }

});