Better approach for XML Creation in Blackberry

Question

I have created XML file,but I can\'t view it/output it.I know there is no way to output created XML file.

Can anyone please suggest what is better way of creating xm

Answer 1

I'm using kXML2 to create/chage/save/read xml. Using it with BlackBerry remember:
- for release you have to preverify it & build proj with ant
Ahmad Ferdous Bin Alam - How to Import kxml jar File to Your Project
Slashdev - BlackBerry Development with Ant & Eclipse
UPDATE: Tutorial: How To Use 3rd Party Libraries in your Applications
- for debug you have to add kXML sources and org.xmlpull.v1 sources to your BB project

Create XML

    Document d = new Document();
    Element root = d.createElement("", "parent");       
    root.setName("catalog");
    Element book = d.createElement("", "child");            
    book.setName("book");       
    book.setAttribute(null, "id", "1");             
    Element author = d.createElement("", "child");              
    author.setName("author");               
    author.addChild(0, Node.TEXT, "Colin Wilson");      
    book.addChild(0, Node.ELEMENT, author);

    Element title = d.createElement("", "child");           
    title.setName("title");             
    title.addChild(0, Node.TEXT, "The Mind Parasites");     
    book.addChild(1, Node.ELEMENT, title);

    Element genre = d.createElement("", "child");           
    genre.setName("genre");
    genre.addChild(0, Node.TEXT, "Horror novel, Science fiction novel");    
    book.addChild(2, Node.ELEMENT, genre);

    Element publishDate = d.createElement("", "child");             
    publishDate.setName("publish-date");                
    publishDate.addChild(0, Node.TEXT, "1967"); 
    book.addChild(3, Node.ELEMENT, publishDate);

    root.addChild(0, Node.ELEMENT, book);
    d.addChild(root.ELEMENT, root);

Save XML on BlackBerry filesystem

• If use emulator don't forget to emulate SD card (Tools->Change SD Card...)

• be sure you have access rights for read/write operation

  String fileName = "file:///SDCard/books.xml";
  DataOutputStream os = null;
  FileConnection fc = null;
  try {
      fc = (FileConnection) Connector.open(fileName, Connector.READ_WRITE);
      if (!fc.exists())
          fc.create();
  
      os = fconn.openDataOutputStream();
      KXmlSerializer serializer = new KXmlSerializer();
      serializer.setOutput(os, "UTF-8");
      d.write(serializer);
  
  } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
  } 
  

  See also:
  RIM API - Interface FileConnection
  SUN Dev Network - Getting Started with the FileConnection APIs
  RIM - How To - Add plain text or binary files to an application
  BB Support Forum - Some questions about FileConnection/JSR 75
  Sony Ericsson Forum - Create XML file

Read XML file

    Document d= new Document();
    FileConnection fc =  null;
    DataInputStream is = null;
    try {
        fc = (FileConnection) Connector.open(fileName, Connector.READ);
        is = fc.openDataInputStream();

        KXmlParser parser = new KXmlParser();
        parser.setInput(is, "UTF-8");
        d.parse(parser);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (XmlPullParserException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

See also: RoseIndia.net - J2ME Kxml Example

Change XML document

All you have to do is get needed element and change it:

    Element catalog = d.getElement("", "catalog");

    Element book = catalog.getElement("", "book");

    Element title = book.getElement("", "title");
    title.removeChild(0);
    title.addChild(Element.TEXT, "Spider World: The Tower");

    Element publish = book.getElement("", "publish-date");
    publish.removeChild(0);
    publish.addChild(Element.TEXT, "1987");

Output XML document to BlackBerry screen (somewhere in Screen class)

Simply serialize xml doc to string and put it in RichTextField:

    deleteAll();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();       
    KXmlSerializer serializer = new KXmlSerializer();
    try {
        serializer.setOutput(baos, "UTF-8");
        d.write(serializer);    
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }   
    add(new RichTextField(baos.toString()));