public static String bytes2HexString(byte[] b) {

String r = "";

for (int i = 0; i < b.length; i++) {

String hex = Integer.toHexString(b[i] & 0xFF);

if (hex.length() == 1) {

hex = '0' + hex;

}

r += hex.toUpperCase()+" ";

}

return r;

}

 

 

bytes2HexString(OldFile.getValue().getBytes())