Android: Hmac SHA512 in java

I have the following code in php:

$binKey = pack("H*", $keyTest);
$hmac = strtoupper(hash_hmac($pbx_hash, $msg, $binKey));

How can i achieve the same in android (java).

I have tried few methods available for hmac sha512 but the result of php snippet is different from that of mine.

Thanks in advance

via Chebli Mohamed