Android Utililty Methods Hex String Create

return getHexString(new int[] { i });

for (int i = 0; i < sampleData.length(); i++) {
    if (!isHexStringChar(sampleData.charAt(i)))
        return false;
return true;

return (Character.isDigit(c) || Character.isWhitespace(c) || (("0123456789abcdefABCDEF"
        .indexOf(c)) >= 0));

int index = filename.lastIndexOf(".");
if (index != -1) {
    return filename.substring(index, filename.length());
} else {
    return "";

int point = fileName.lastIndexOf('.');
int length = fileName.length();
if (point == -1 || point == length - 1) {
    return "";
} else {
    return fileName.substring(point + 1, length);

if (hexString == null || hexString.equals("")) {
    return null;
hexString = hexString.toUpperCase();
int byteArrayLength = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[byteArrayLength];
for (int i = 0; i < byteArrayLength; i++) {
...

stringbuffer.append(toHexChar(byte0 >> 4));
stringbuffer.append(toHexChar(byte0));

return toHexString((byte) achar0);

if (str == null) {
    return null;
char[] charArray = str.toCharArray();
if (charArray.length % 2 != 0) {
    throw new RuntimeException(
            "hex str length must can mod 2, str:" + str);
byte[] bytes = new byte[charArray.length / 2];
for (int i = 0; i < charArray.length; i++) {
    char c = charArray[i];
    int b;
    if (c >= '0' && c <= '9') {
        b = (c - '0') << 4;
    } else if (c >= 'A' && c <= 'F') {
        b = (c - 'A' + 10) << 4;
    } else {
        throw new RuntimeException("unsport hex str:" + str);
    c = charArray[++i];
    if (c >= '0' && c <= '9') {
        b |= c - '0';
    } else if (c >= 'A' && c <= 'F') {
        b |= c - 'A' + 10;
    } else {
        throw new RuntimeException("unsport hex str:" + str);
    bytes[i / 2] = (byte) b;
return bytes;

return convertToHex(dataDigest(input));