Haven't played with this KXML. Does it have a constructor that takes an
InputStream type as an argument? If so, you can create your own version
of CountingBytesInputStream which acts as a filter. Something like
this:

class CountingBytesInputStream extends FilterInputStream {
   ... // implements methods that call super's methods
   int getCount() {
       ...
   }
}

Then you can call:
   CountingBytesInputStream cbis = new
CountingBytesInputStream(inStream);
   KXML k = new KXML(cbls);
   ....
   System.err.println(clbs.getCount());

You can even add a callback into this class. For example, the
constructor can be
   CountingBytesInputStream(Updater u, InputStream stream) {
       this.updater = u;
   }

And then you can call it in the overriden read methods like this
   int read(...) {
       .....
       if (count % 1024 == 0) updater.notify(count);
   }