Android uses the pull parser to generate XML files and read XML files. androidpull

Android uses the pull parser to generate XML files and read XML files. androidpull

In Android, the Pull parser 1 is used, and the running mode of the Pull parser is similar to that of the SAX Parser. It provides similar events, such as the start element and end element events. 2. Use parser. next () to enter the next element and trigger the corresponding event. 3. The event is sent as an int value. Therefore, you can use a switch to process the event. 4. When parsing an element, call the parser. nextText () method to obtain the value of the next Text node. 5. Related API: Get the current node event type: parser. getEventType (); get the next node event type: parser. next (); get the tag property value: parser. getAttributeValue (); get the text after the tag: parser. nextText (); example: <? Xml version = "1.0" encoding = "UTF-8"?> <Persons> <person id = "18"> <name> allen </name> <age> 36 </age> </person> <person id = "28"> <name> james </name> <age> 25 </age> </person> </persons> // use the Pull parser to generate an XML file, write the local private void writeXmlToLocal () {List <Person> personList = getPersonList (); // obtain the serialized object XmlSerializer serializer = Xml. newSerializer (); // XmlSerializer serializer = XmlPullParserFactory. newInstance (). newSerializer (); try {File path = new File (Environm Ent. getExternalStorageDirectory (), "persons. xml "); FileOutputStream fos = new FileOutputStream (path); // specify the output location of the serialized object and the encoding serializer. setOutput (fos, "UTF-8"); // Write Start <? Xml version = '1. 0' encoding = 'utf-8' standalone = 'Yes'?> Serializer. startDocument ("UTF-8", true); serializer. startTag (null, "persons"); // <persons> for (Person person: personList) {// start to write personserializer. startTag (null, "person"); // <person> serializer. attribute (null, "id", String. valueOf (person. getId (); // write the nameserializer of person. startTag (null, "name"); // <name> serializer. text (person. getName (); serializer. endTag (null, "name"); // </name> // write the ageserial of person Izer. startTag (null, "age"); // <age> serializer. text (String. valueOf (person. getAge (); serializer. endTag (null, "age"); // </age> serializer. endTag (null, "person"); // </person>} serializer. endTag (null, "persons"); // </persons> serializer. endDocument (); // end} catch (Exception e) {e. printStackTrace () ;}}// use the Pull parser to read the private List of the local XML File <Person> parserXmlFromLocal () {try {File path = new File (Environment. get ExternalStorageDirectory (), "persons. xml "); FileInputStream FCM = new FileInputStream (path); // get the pull parser object XmlPullParser parser = Xml. newPullParser (); // XmlPullParser parser = XmlPullParserFactory. newInstance (). newPullParser (); // specify the parsed file and encoding format parser. setInput (FCM, "UTF-8"); // obtain the event type int eventType = parser. getEventType (); List <Person> personList = null; Person person = null; String id; while (eventType! = XmlPullParser. END_DOCUMENT) {// obtain the name of the current node String tagName = parser. getName (); switch (eventType) {case XmlPullParser. START_TAG: // The current value is equal to the Start Node <person> if ("persons ". equals (tagName) {// <persons> personList = new ArrayList <Person> ();} else if ("person ". equals (tagName) {// <person id = "1"> person = new Person (); id = parser. getAttributeValue (null, "id"); person. setId (Integer. valueOf (id);} else if ("name ". equals (tagName) {// <name> person. setName (parser. nextText ();} else if ("age ". equals (tagName) {// <age> person. setAge (Integer. parseInt (parser. nextText ();} break; case XmlPullParser. END_TAG: // </persons> if ("person ". equals (tagName) {// Add the person object with the set value above to the personList in the set. add (person);} break; default: break;} // obtain the next event type eventType = parser. next ();} return personList;} catch (Exception e) {e. printStackTrace ();} return null ;}}