private String cacleTotal(String number, String price) {
    if (!ValidateUtil.isNumeric(number)) {
      return null;
    } else if (!ValidateUtil.isDecimal(price)) {
      return null;
    }

    int numInt = Integer.parseInt(number);
    double priceDb = Double.parseDouble(price);

    return String.valueOf(numInt * priceDb);
  }
  private boolean checkForm() {
    String productNumberStr = productNumber.getText().toString();
    String productPriceTextStr = productPriceText.getText().toString();

    boolean isFlag = true;

    if (!ValidateUtil.isNumeric(productNumberStr)) {
      numberTextInputLayout.setError("请输入整数!");
      isFlag = false;
    } else {
      numberTextInputLayout.setErrorEnabled(false);
    }

    if (!ValidateUtil.isDecimal(productPriceTextStr)) {
      priceTextInputLayout.setError("请输入小数 xx.xx!");
      isFlag = false;
    } else {
      priceTextInputLayout.setErrorEnabled(false);
    }
    return isFlag;
  }