Android - XPath evaluate very slow

Question

I\'m using XPath to query my XML-file which has at the moment about 100KB.

I\'m iterating of an array and query for every valu

Answer 1

Thanks to @nvrmnd I tried a bit around and found a way better parser:

VTD-XML

Here's a example from the devlopers.

But this Tutorial is way better...

Hope this helps anyone being as frustrated as I was...

Answer 2

XPath itself is not very efficient when it comes to iterating through big XML-documents. I myself made the experience that parsing values out of a ~200kb XML-file took around 10 seconds on a low-end device.

After that I reimplemented the parser as a SAXParser and had huge performance increases of around 2 orders of magnitude. So I would propose that you try the SAXParser. It is actually not too hard to implement and there are a couple of tutorials out there.

There also exists a question on stackoverflow that deals with the topic of the various parsing methods: SAX vs. DOM vs. XPath

I also assume that the evaluation is done in no time when you don't use NodeSet because it will only look for a single node and return as soon as it has found a matching node.

EDIT:

Parsing the XML-document with SAX means that you iterate through it and store the sought information within objects. Take a look at this tutorial: SAX Tutorial

There the author parses staff information and transforms it into objects so I guess that's exactly what you need.