XML parsing in Android

Like other systems, android can parse XML in three ways: sax, Dom, and pull. This document mainly records the PULL mode.

Pull parses XML in an event-driven manner. When pull reaches a tag, it can return an event. We parse the entire XML document based on the event.

/** <Br/> * instream indicates the input stream of the file to be parsed <br/> */<br/> Public static list <person> getpersons (inputstream instream) {<br/> List <person> Persons = NULL; <br/> person = NULL; <br/> xmlpullparser parser = xml. newpullparser (); <br/> parser. setinput (instream, "UTF-8"); <br/> int eventtype = parser. geteventtype (); // generates the first event <br/> while (eventtype! = Xmlpullparser. end_document) {// as long as it is not a document end event <br/> switch (eventtype) {<br/> case xmlpullparser. start_document: // actually <persons> <br/> Persons = new arraylist <person> (); <br/> break; </P> <p> case xmlpullparser. start_tag: // actually <person <name <age <br/> string name = parser. getname (); // get the name of the element currently pointed to by the parser <br/> If ("person ". equals (name) {<br/> person = new person (); <br/> person. setid (New INTEGER (parser. getattributeval UE (0); <br/>}< br/> If (person! = NULL) {<br/> If ("name ". equals (name) {<br/> person. setname (parser. nexttext (); // obtain the value of the parser that points to the next text node of the element <br/>}< br/> If ("age ". equals (name) {<br/> person. setage (new short (parser. nexttext (); <br/>}< br/> break; </P> <p> case xmlpullparser. end_tag: // actually </person> </age> </Name> <br/> If ("person ". equals (parser. getname () {<br/> persons. add (person); <br/> person = NULL; <br/>}< br/> break; <br/>}< br/> eventtype = parser. next (); <br/>}< br/> return persons; <br/>}

<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <persons> <br/> <person id = "23"> <br/> <Name> liming </Name> <br/> <age> 30 </age> <br/> </person> <br/> <person id = "20"> <br/> <Name> lixiangmei </Name> <br/> <age> 25 </age> <br/> </person> <br/> </persons> <br/>

 

Additional use of pull to write XML:

Public static void save (list <person> persons, writer) {<br/> xmlserializer serializer = xml. newserializer (); <br/> serializer. setoutput (writer); <br/> serializer. startdocument ("UTF-8", true); </P> <p> serializer. starttag (null, "persons"); <br/> for (person: Persons) {<br/> serializer. starttag (null, "person"); <br/> serializer. attribute (null, "ID", person. GETID (). tostring (); </P> <p> serializer. starttag (null, "name"); <br/> serializer. text (person. getname (); <br/> serializer. endtag (null, "name"); </P> <p> serializer. starttag (null, "Age"); <br/> serializer. text (person. getage (). tostring (); <br/> serializer. endtag (null, "Age"); </P> <p> serializer. endtag (null, "person"); <br/>}< br/> serializer. endtag (null, "persons"); <br/> serializer. enddocument (); <br/> writer. flush (); <br/> writer. close (); <br/>}