public void onCreate(Bundle savedInstanceState)
{
quantity=(Spinner)findViewById(R.id.quantity);

quantity.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
        {
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id)
            {
                if(quantity.getSelecteditem.equals("5")){

               price.setText("200");
             }

                System.out.println("it works...   ");

            }

            public void onNothingSelected(AdapterView<?> parent)
            {

            }
        });


}