Java String to SHA1

UPDATE
You can use Apache Commons Codec (version 1.7+) to do this job for you.

DigestUtils.sha1Hex(stringToConvertToSHexRepresentation)

Thanks to @Jon Onstott for this suggestion.

Old Answer
Convert your Byte Array to Hex String. Real's How To tells you how.

return byteArrayToHexString(md.digest(convertme))

and (copied from Real's How To)

public static String byteArrayToHexString(byte[] b) {
  String result = "";
  for (int i=0; i < b.length; i++) {
    result +=
          Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring( 1 );
  }
  return result;
}

BTW, you may get more compact representation using Base64. Apache Commons Codec API 1.4, has this nice utility to take away all the pain. refer here

This is my solution of converting string to sha1. It works well in my Android app:

private static String encryptPassword(String password)
{
    String sha1 = "";
    try
    {
        MessageDigest crypt = MessageDigest.getInstance("SHA-1");
        crypt.reset();
        crypt.update(password.getBytes("UTF-8"));
        sha1 = byteToHex(crypt.digest());
    }
    catch(NoSuchAlgorithmException e)
    {
        e.printStackTrace();
    }
    catch(UnsupportedEncodingException e)
    {
        e.printStackTrace();
    }
    return sha1;
}

private static String byteToHex(final byte[] hash)
{
    Formatter formatter = new Formatter();
    for (byte b : hash)
    {
        formatter.format("%02x", b);
    }
    String result = formatter.toString();
    formatter.close();
    return result;
}