second_amount = Double.parseDouble(second.getText().toString());
                first_amount = Double.parseDouble(first.getText().toString());
                result = first_amount * second_amount;
                second.setText("" + df.format(result));

second_amount = Double.parseDouble();
                bdf = new BigDecimal(second.getText().toString());
                //first_amount = Double.parseDouble(first.getText().toString());
                bds = new BigDecimal(second.getText().toString());
                BigDecimal bdr = bdf.multiply(bds);
                //result = first_amount * second_amount;
                second.setText("" + bdr);