bytes2HexString

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())