Parse XML files using sax in Android

1. Write an XML file in the assets File

<? XML version = "1.0" encoding = "UTF-8"?> <Persons> <person id = "23"> <Name> Li Ming </Name> <age> 30 </age> </person> <person id = "20"> <name> Li xiangmei </Name> <age> 25 </age> </person> </persons>

2. Write a sax-parsed class in the service

Package COM. example. service; import Java. util. arraylist; import Java. util. list; import Org. XML. sax. attributes; import Org. XML. sax. saxexception; import Org. XML. sax. helpers. defaulthandler; import COM. example. domain. person; public class xmlcontenthandler extends defaulthandler {// The resolved person object is stored in the private list <person> persons in the list set; // parse the current person object public person currentperson; // declare the tag name Public String tagname; // obtain the resolution Institute Some person objects are public list <person> getpersons () {return persons;} @ overridepublic void characters (char [] CH, int start, int length) throws saxexception {super. characters (CH, start, length); // first, judge whether the tagname is null if (tagname! = NULL) {string data = new string (CH, start, length); // checks whether the tag is empty if (tagname. equals ("name") {currentperson. setname (data);} else if (tagname. equals ("Age") {// determine whether the tag is agecurrentperson. setage (short) integer. parseint (data) ;}}@ overridepublic void enddocument () throws saxexception {super. enddocument () ;}@ overridepublic void endelement (string Uri, string localname, string QNAME) throws saxexception {super. endelement (Uri, localname, QNAME); // when the person Tag ends, store the person object in the set if (localname. equals ("person") {persons. add (currentperson); currentperson = NULL;} This. tagname = NULL;}/*** event triggered at the beginning of the document */@ overridepublic void startdocument () throws saxexception {super. startdocument (); Persons = new arraylist <person> () ;}@ overridepublic void startelement (string Uri, string localname, string QNAME, attributes) throws saxexception {super. startelement (Uri, localname, QNAME, attributes); // determine whether the parsed tag is personif (localname. equals ("person") {currentperson = new person (); // parse the value of the ID attribute and assign the ID to the currentperson object currentperson. setid (integer. parseint (attributes. getvalue (0);} This. tagname = localname ;}}

3. Get the operations of the sax class in the activity

Package COM. example. lession03_xml; import Java. io. inputstream; import Java. util. list; import javax. XML. parsers. saxparser; import javax. XML. parsers. saxparserfactory; import COM. example. domain. person; import COM. example. service. xmlcontenthandler; import COM. example. service. xmldomservice; import android. OS. bundle; import android. app. activity; import android. view. menu; import android. view. view; import android. view. view. onclicklistener; import android. view. inputmethod. inputbinding; import android. widget. button; import android. widget. toast; public class xmlactivity extends activity {// declare the public button btn_sax, btn_dom, btn_pull; Public xmldomservice; @ overrideprotected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); // sets the displayed view setcontentview (R. layout. activity_xml); xmldomservice = new xmldomservice (); // obtain the component btn_sax = (button) findviewbyid (R. id. btn_sax); btn_dom = (button) findviewbyid (R. id. btn_dom); btn_pull = (button) findviewbyid (R. id. btn_pull); // register the event listener for the button (New myonclicklistener (); btn_dom.setonclicklistener (New myonclicklistener (); btn_pull.setonclicklistener (New myonclicklistener ());} @ overridepublic Boolean oncreateoptionsmenu (menu) {// inflate the menu; this adds items to the action bar if it is present. getmenuinflater (). inflate (R. menu. XML, menu); Return true;} // Anonymous class myonclicklistener implements onclicklistener {@ overridepublic void onclick (view v) {int id = v. GETID (); Switch (ID) {case R. id. btn_sax: Toast. maketext (xmlactivity. this, "using sax Parsing", toast. length_long ). show (); try {// The factory object saxparserfactory factory parsed by sax = saxparserfactory. newinstance (); // get the SAX Parser saxparser = factory. newsaxparser (); // create the handler object xmlcontenthandler handlerservice = new xmlcontenthandler (); inputstream is = getassets (). open ("csdn. XML "); // parse saxparser directly. parse (is, handlerservice); // get toast through the handlerservice object. maketext (xmlactivity. this, "----" + handlerservice, toast. length_long ). show ();} catch (exception e) {e. printstacktrace ();} break; case R. id. btn_dom: inputstream is = NULL; try {// get the input stream object for reading the file is = getassets (). open ("csdn. XML "); // use Dom to parse list <person> Persons = xmldomservice. parsexml (is); // simple test // toast. maketext (xmlactivity. this, "" + persons. get (0 ). getname (), toast. length_long ). show (); toast. maketext (xmlactivity. this, "using Dom Parsing" + persons. get (0 ). getname (), toast. length_long ). show ();} catch (exception e) {e. printstacktrace ();} break; case R. id. btn_pull: Toast. maketext (xmlactivity. this, "using pull Parsing", toast. length_long ). show (); break; default: break ;}}}}