How to verify PAN card?

Question

How to check the validation of edittext for pan card like \"ABCDE1234F\". I am confused how to check the the validation for this. Please help me guys. I will appreciate any kind

Answer 1

Note that none of other answers available so far doesn't verify PAN check digit.

Here is Luhn algorythm from http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers#Java:

public static boolean luhnTest(String number) {
    int s1 = 0, s2 = 0;
    String reverse = new StringBuffer(number).reverse().toString();
    for (int i = 0 ; i < reverse.length(); i++){
        int digit = Character.digit(reverse.charAt(i), 10);
        if (i % 2 == 0) { //this is for odd digits, they are 1-indexed in the algorithm
            s1 += digit;
        } else { //add 2 * digit for 0-4, add 2 * digit - 9 for 5-9
            s2 += 2 * digit;
            if (digit >= 5) {
                s2 -= 9;
            }
        }
    }
    return (s1 + s2) % 10 == 0;
}