How to validate iranian Melli Code (National Code or Code Melli) in android

Question

I need a method to validate the Melli Code (National Code or Code Melli) of iranian people.

I Know it has a formula.

Answer 1

Good job Alireza, Here is my code which is very similar to yours.

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private boolean isValidNationalCode(String nationalCode) {
    if (nationalCode.length() != 10) {
      return false;
    } else {
      //Check for equal numbers
      String[] allDigitEqual = {"0000000000", "1111111111", "2222222222", "3333333333",
          "4444444444", "5555555555", "6666666666", "7777777777", "8888888888", "9999999999"};
      if (Arrays.asList(allDigitEqual).contains(nationalCode)) {
        return false;
      } else {
        int sum = 0;
        int lenght = 10;
        for (int i = 0; i < lenght - 1; i++) {
          sum += Integer.parseInt(String.valueOf(nationalCode.charAt(i))) * (lenght - i);
        }

        int r = Integer.parseInt(String.valueOf(nationalCode.charAt(9)));

        int c = sum % 11;

        return (((c < 2) && (r == c)) || ((c >= 2) && ((11 - c) == r)));
      }

    }
  }