elegos wrote:
> I'm new to the Java programming (see the other messages), I come from
> PHP for handling XML files. I usually use SimpleXML, a very simple
> class to manage this type of files. Here is an example:
>
> $xml = new simplexml_load("http://mycoolsite.com/file.xml";);
> foreach($xml->contents as $entity => $value)
> echo "$entity: $value";
>
> Ok, now tell me why I should handle XML files like THIS:
> http://www.anddev.org/parsing_xml_from_the_net_-_using_the_saxparser-t353.html
1. Because it is part of standard Java.
2. Because you are no longer writing PHP to run on a 2009 Web server,
with quad-core-plus processors and multiple GB of RAM; rather, you are
writing Java for a phone whose hardware specifications most closely
resemble a Web server from 1996. Having owned and operated a Web server
in 1996, I speak from personal experience...
Parsing an XML file fully into RAM can be done (using the DOM parser),
but it is expensive in terms of CPU time and RAM, neither of which exist
in abundance on a phone. The better-performing solutions, SAX and XPP,
are event-based, meaning you only hold onto in RAM the bits and pieces
you actually need, and Java can accelerate past chunks of the file that
you do not need.
Of the three (DOM, SAX, XPP), XPP is probably the least used, since it
is not part of standard Java, though it is available in the Android SDK
via a third-party library. Hence, the other two will be more widely
documented, with samples and tutorials and books and whatnot.
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
Android Training in Germany, 18-22 January 2010: http://bignerdranch.com
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