Android Utililty Methods ID Generate

if (sequence == Long.MAX_VALUE)
    sequence = 0;
return convertLongToDateString(System.currentTimeMillis(),
        "yyyy-MM-dd hh:mm:ss")
        + "-"
        + String.format("%20d", sequence++);

String mark = String.valueOf(System.currentTimeMillis());
return mark;

try {
    StringBuilder builder = new StringBuilder();
    for (Object s : value) {
        builder.append(String.valueOf(s));
    MessageDigest md = MessageDigest.getInstance("sha-1");
    md.update(builder.toString().getBytes());
    byte[] hashValBytes = md.digest();
...

if (md == null) {
    return 0L;
StringBuilder builder = new StringBuilder();
for (Object s : value) {
    builder.append(String.valueOf(s));
byte[] hashValBytes;
...

return UUID.randomUUID().toString();

String androidId = android.provider.Settings.Secure.getString(
        context.getContentResolver(),
        android.provider.Settings.Secure.ANDROID_ID);
if (androidId != null)
    return getHash(androidId);
return null;

SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
        "yyyy-MM-dd-HH-mm-ss-SSS");
return simpleDateFormat.format(Calendar.getInstance().getTime());

UUID uniqueKey = UUID.randomUUID();
return uniqueKey.toString();