Android Utililty Methods String to Byte Array Convert

char[] nibbles;
int i, x, limit = strings.length(binary);
if (limit == 0)
    return new byte[0];
nibbles = new char[limit];
for (i = 0, x = 0; i < limit; i++) {
    if (strings.isHexChar(binary.charAt(i)))
        nibbles[x++] = (char) Character.digit(binary.charAt(i), 16);
...

ByteArrayOutputStream bs = new ByteArrayOutputStream();
byte[] raw = str.getBytes();
for (int i = 0; i < raw.length; i++) {
    if (!Character.isWhitespace((char) raw[i]))
        bs.write(raw[i]);
byte[] in = bs.toByteArray();
if (in.length % 2 != 0) {
...

if (hexa.length() % 2 != 0) {
    throw new IllegalArgumentException("String hexa inv?lida");
byte[] b = new byte[hexa.length() / 2];
for (int i = 0; i < hexa.length(); i += 2) {
    b[i / 2] = (byte) ((hexDigits.indexOf(hexa.charAt(i)) << 4) | (hexDigits
            .indexOf(hexa.charAt(i + 1))));
return b;

int len = hexString.length() / 2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
    result[i] = Integer.valueOf(
            hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
return result;

int len = hexString.length() / 2;
byte[] result = new byte[len];
for (int i = 0; i < len; i++)
    result[i] = Integer.valueOf(
            hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
return result;

if (str == null) {
    return null;
try {
    return str.getBytes(CHARSET_NAME_UTF8);
} catch (final UnsupportedEncodingException e) {
    throw new RuntimeException(e.getMessage(), e);

try {
    return data.getBytes(DEFAULT_CHARSET);
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
return null;

int length = 0;
if (str == null || str.length() == 0) {
    return length;
for (int i = 0; i < str.length(); i++) {
    int ascii = Character.codePointAt(str, i);
    if (ascii >= 0 && ascii <= 255) {
        length++;
...

String s = new String(str);
int len = 0;
for (int i = 0; i < s.length(); i = s.offsetByCodePoints(i, 1)) {
    len += bytesUtf8(s.codePointAt(i));
return len;

String s = new String(str);
int len = 0;
for (int i = 0; i < s.length(); i = s.offsetByCodePoints(i, 1)) {
    len += bytesUtf8(s.codePointAt(i));
return len;