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1private String getHmac(String textToSign, String apiKey) {
2    String result = "";
3    try {
4        Charset utf8CharSet = Charset.forName("UTF-8");
5        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
6        SecretKeySpec secret_key = new javax.crypto.spec.SecretKeySpec(utf8CharSet.encode(apiKey).array(), "HmacSHA256");
7        sha256_HMAC.init(secret_key);
8        byte[] mac_data = sha256_HMAC.doFinal(utf8CharSet.encode(textToSign).array());
9        for (byte element : mac_data)
10        {
11            result += Integer.toString((element & 0xff) + 0x100, 16).substring(1);
12        }
13    } catch (Exception e) { 
14        result = e.toString();
15    }
16    return result;
17}