Parse XML files using DOM 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 DOM parsing operation in the service

Package COM. example. service; import Java. io. inputstream; import Java. util. arraylist; import Java. util. list; import javax. XML. parsers. documentbuilder; import javax. XML. parsers. documentbuilderfactory; import Org. w3C. dom. document; import Org. w3C. dom. element; import Org. w3C. dom. node; import Org. w3C. dom. nodelist; import COM. example. domain. person; public class xmldomservice {public list <person> parsexml (inputstream is) {list <person> List = new arraylist <person> (); // create the DOM factory object documentbuilderfactory factory = documentbuilderfactory. newinstance (); try {// documentbuilder object documentbuilder builder = factory. newdocumentbuilder (); // obtain the Document Object document = builder. parse (is); // obtain the rootelement root = Document of the Document Object. getdocumentelement (); // obtain all the person node objects in the root node of persons. nodelist personnodes = root. getelementsbytagname ("person"); // traverses all the person nodes for (INT I = 0; I <personnodes. getlength (); I ++) {person = new person (); // obtain the Node object element personnode = (element) personnodes corresponding to the index based on item (index. item (I); // specific person node // sets the ID attribute value "person. setid (integer. parseint (personnode. getattribute ("ID"); // get all the byte points under the node nodelist personchildnodes = personnode. getchildnodes (); // traverses the byte points of person for (INT Index = 0; index <personchildnodes. getlength (); index ++) {// obtain the subnode node = personchildnodes. item (INDEX); // determines whether a node is an element node. If (node. getnodetype () = node. element_node) {// converts a node to an element = (element) node; // determines whether the element node is a name element node if ("name ". equals (element. getnodename () {person. setname (element. getfirstchild (). getnodevalue ();} else if ("age ". equals (element. getnodename () {// determines whether it is an age node person. setage (new short (element. getfirstchild (). getnodevalue () ;}}// Add the person object to the list in the set. add (person);} // close the input stream is. close ();} catch (exception e) {// todo auto-generated catch blocke. printstacktrace ();} return list ;}}

3. Display operations in 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 ;}}}}