XML 4 parsing examples

Functional classification: Tools

Supported platforms: Android

Operating environment: Eclipse

Development language: Java

Development tool: Eclipse

Source code size: 13.01MB

Source code introduction

A summary example of how XML files are parsed in Android.

It includes the specific implementation steps of parsing the sample XML file using DOM parsing, DOM4J parsing, pull parsing and SAX parsing, with detailed comments. This example parses the XML file into entity classes and displays them through pstView.

Note: dom4j parsing requires an additional class library: dom4j-1.6.1.jar. The compressed package provides a complete dom4j class library. If you only need to do parsing, just import dom4j-1.6.1.jar.

Source code running screenshot

Clicking different buttons will parse in different ways, but the display effect is the same

After the analysis is completed, it will be displayed through pstview

Click on an entry to display detailed information (from the XML file)

Source code snippet

 /**Android has built-in pull parsing, which saves more memory than DOM parsing.*/  
 pubpc   class XmlPullParserUtil { 
  
 pubpc   static Arraypst<cdentity> pullParser(InputStream in){
        Arraypst<cdentity> cds = null ;
 try {
 //Build the pull parsing factory  
            XmlPullParserFactory factory;
            factory = XmlPullParserFactory.newInstance();
 //Build the pull parser object  
            XmlPullParser parser = factory.newPullParser();
 //Set the data source of the parser  
            parser.setInput( new InputStreamReader(in));
 //Get the event and start parsing  
 int eventType = parser.getEventType();
 //The CD object to be generated  
            CDEntity entity = null ;
 //Loop through the XML document until you reach the end of the document  
 while (eventType != XmlPullParser.END_DOCUMENT){
 switch (eventType) {
 //Construct the Arraypst object at the beginning of the xml document.  
 case XmlPullParser.START_DOCUMENT:
                    cds = new Arraypst<cdentity>();
 break ;
 //Judge the tag name at the beginning of the tag  
 case XmlPullParser.START_TAG:
                    String name = parser.getName();
 //When the tag name is CD, construct a CD object  
 if ( "CD" .equals(name)){
                        entity = new CDEntity();
 //If the tag is title, then cd must not be empty, and the obtained text is the cd title, then set the title attribute of cd to the text of the title tag  
 } else   if ( "TITLE" .equals(name)){
                        entity.setTitle(parser.nextText());
 } else   if ( "ARTIST" .equals(name)){
                        entity.setArtist(parser.nextText());
 } else   if ( "COUNTRY" .equals(name)){
                        entity.setCountry(parser.nextText());
 } else   if ( "COMPANY" .equals(name)){
                        entity.setCompany(parser.nextText());
 } else   if ( "PRICE" .equals(name)){
                        entity.setPrice(Float.parseFloat(parser.nextText()));
 } else   if ( "YEAR" .equals(name)){
                        entity.setYear(Integer.parseInt(parser.nextText()));
 }
 break ;
 //After the tag ends, determine what the end tag is. If the cd tag ends, the generation of the cd object is complete and it should be added to Arraypst  
 case XmlPullParser.END_TAG:
 if ( "CD" .equals(parser.getName())){
                        cds.add(entity);
 }
 break ;
 }
 //After the loop is finished, the label needs to be set to the next label to avoid an infinite loop  
                eventType = parser.next();
 }
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
 }
        System.out.println(cds);
 return cds;
 }
 }
 </cdentity></cdentity></cdentity>