Android Utililty Methods Random String Create

String returnStr = "";
char[] ch = new char[len];
Random rd = new Random();
for (int i = 0; i < len; i++) {
    ch[i] = (char) (rd.nextInt(9) + 97);
returnStr = new String(ch);
return returnStr;
...

if (length < 1) {
    return null;
Random random = new Random();
char[] buf = new char[length];
int index = 0;
for (int i = 0; i < length; i++) {
    index = random.nextInt(SOURCE.length);
...

Random random = new Random(System.currentTimeMillis());
byte[] randomBytes = new byte[length];
for (int i = 0; i < length; i++) {
    randomBytes[i] = CHARS[random.nextInt(CHARS.length)];
return new String(randomBytes);

StringBuilder sb = new StringBuilder();
for (int i = 0; i < size; i++) {
    sb.append((char) (((int) 'A') + Math.random() * 25));
return sb.toString();

return new BigInteger(130, random).toString(16);

final SecureRandom random = new SecureRandom();
return String.valueOf(random.nextLong());

StringBuilder sb = new StringBuilder();
for (int i = 0; i < 6; i++) {
    sb.append(getRandomIntNum(9));
return sb.toString();

Random r = new Random();
String letter = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
StringBuffer sb = new StringBuffer();
for (int i = 0; i < pLength; i++) {
    sb.append(letter.charAt(r.nextInt(1000000) % (letter.length())));
return sb.toString();

Random number = new Random();
StringBuilder message = new StringBuilder();
for (int i = 0; i < 1405; i++) {
    message.append('a' + number.nextInt(52));
return message.toString();

StringBuffer buffer = new StringBuffer();
String characters = "abcdefghijklmnopqrstuvwxyz0123456789";
int charactersLength = characters.length();
for (int i = 0; i < length; i++) {
    double index = Math.random() * charactersLength;
    buffer.append(characters.charAt((int) index));
return buffer.toString();
...