LWUIT和使用kXML解析器

Uncaught exception: java.lang.Error: Static initializer: java.lang.NullPointerException, 0 
- java.lang.Class.throwError(), bci=57 
- java.lang.Class.initialize(), bci=221 
- com.sun.lwuit.Component.<init>(), bci=5 
- com.sun.lwuit.Container.<init>(), bci=1 
- com.sun.lwuit.Form.<init>(), bci=8 
- com.sun.lwuit.Form.<init>(), bci=1 
- com.midlet.RSSMidlet.<init>(), bci=11 
- java.lang.Class.newInstance(), bci=0 
- com.sun.midp.main.CldcMIDletLoader.newInstance(), bci=46 
- com.sun.midp.midlet.MIDletStateHandler.createMIDlet(), bci=66 
- com.sun.midp.midlet.MIDletStateHandler.createAndRegisterMIDlet(), bci=17 
- com.sun.midp.midlet.MIDletStateHandler.startMIDlet(), bci=9 
- com.sun.midp.midlet.MIDletStateHandler.startMIDlet(), bci=4 
- com.sun.midp.appmanager.SelectorBase.run(), bci=33 
- java.lang.Thread.run(), bci=11

編碼：LWUIT和使用kXML解析器

package com.midlet; 

import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.Vector; 

import javax.microedition.io.Connector; 
import javax.microedition.io.HttpConnection; 
import javax.microedition.midlet.MIDlet; 
import javax.microedition.midlet.MIDletStateChangeException; 
import org.kxml2.io.KXmlParser; 
import org.xmlpull.v1.XmlPullParser; 
import org.xmlpull.v1.XmlPullParserException; 

import com.sun.lwuit.Command; 
import com.sun.lwuit.Display; 
import com.sun.lwuit.Form; 
import com.sun.lwuit.List; 
import com.sun.lwuit.animations.Transition3D; 
import com.sun.lwuit.events.ActionEvent; 
import com.sun.lwuit.events.ActionListener; 
//import com.sun.lwuit.list.ListModel; 
import com.sun.lwuit.layouts.BorderLayout; 
import com.sun.lwuit.plaf.UIManager; 
import com.sun.lwuit.util.Resources; 

public class RSSMidlet extends MIDlet implements ActionListener{ 

    public Vector feedVector; 
    public String rssFeed; 
    private Command cmdSelect; 
    private Command cmdExit; 

    private Form form1 = new Form("Feeds List"); 
// private Form form2 = new Form("Feed Description"); 

// private Vector feed_Title; 
    private List resultList; 
// private List feedTitle; 
    public RSSModel model = new RSSModel(); 

    class ReadXML extends Thread{ 

     public void run(){ 
      try{ 
       rssFeed = "http://www.rottentomatoes.com/syndication/rss/top_news.xml"; 
       HttpConnection httpConnection = (HttpConnection) Connector.open(rssFeed); 
       KXmlParser parser = new KXmlParser(); 
       parser.setInput(new InputStreamReader(httpConnection.openInputStream())); 

       parser.nextTag(); 
       parser.require(XmlPullParser.START_TAG, null, null); 
       while(parser.nextTag() != XmlPullParser.END_TAG){ 
        parser.nextTag(); 
        parser.require(XmlPullParser.START_TAG, null, "channel"); 
        readXMLData(parser); 
        parser.require(XmlPullParser.END_TAG, null, "channel"); 
       } 
       parser.require(XmlPullParser.END_TAG, null, "rss"); 
       parser.next(); 
       parser.require(XmlPullParser.END_DOCUMENT, null, null); 
      }catch(Exception e){ 

      } 
     } 
    } 

    public RSSMidlet() { 
     // TODO Auto-generated constructor stub 
     Display.init(this); 
     Resources r; 
     try{ 
      r = Resources.open("/LWUITtheme.res"); 
      UIManager.getInstance().setThemeProps(r.getTheme("LWUITDefault")); 
     }catch(IOException e){ 
      //e.printStackTrace(); 
     } 




     resultList = new List(); 
     for(int i=0; i<feedVector.size();i++){ 
      model = (RSSModel) feedVector.elementAt(i); 
      resultList.addItem(model.getTitle().toString()); 
     } 


     form1.addComponent(BorderLayout.CENTER,resultList); 
     form1.addCommand(cmdExit); 
     form1.addCommand(cmdSelect); 
     form1.setScrollable(true); 
     //form1.addCommandListener((ActionListener) this); 
     form1.setTransitionInAnimator(Transition3D.createRotation(250, true)); 
     form1.show(); 
    } 

    protected void destroyApp(boolean unconditional) 
      throws MIDletStateChangeException { 
     // TODO Auto-generated method stub 

    } 

    protected void pauseApp() { 
     // TODO Auto-generated method stub 

    } 

    protected void startApp() throws MIDletStateChangeException { 
     // TODO Auto-generated method stub 


     new ReadXML().start(); 
    } 

    public void readXMLData(KXmlParser parser) throws IOException, XmlPullParserException{ 


     while(!"item".equals(parser.getName())){ 
      /** Check if document doesn't include any item tags */ 
      if(parser.next() == XmlPullParser.END_DOCUMENT) 
       throw new IOException("No items in RSS feed!"); 
     } 

     parser.require(XmlPullParser.START_TAG, null, "item"); 



     while(parser.nextTag() != XmlPullParser.END_TAG){ 

      parser.require(XmlPullParser.START_TAG, null, null); 
      String name = parser.getName(); 
      String text = parser.nextText(); 
      //System.out.println ("<"+name+">"+text); 

      if(name.equals("pubDate")){ 
       model.setPubDate(text); 
      }else if(name.equals("title")){ 
       model.setTitle(text); 
      }else if(name.equals("link")){ 
       model.setLink(text); 
      }else if(name.equals("description")){ 
       model.setDescription(text); 
      } 
      parser.require(XmlPullParser.END_TAG, null, name); 
     } 
     feedVector.addElement(model); 
     parser.require(XmlPullParser.END_TAG, null, "item"); 
    } 

    public void actionPerformed(ActionEvent evt) { 
     // TODO Auto-generated method stub 
     if(evt.getCommand() == cmdExit){ 
      notifyDestroyed(); 
     }else if(evt.getCommand() == cmdSelect){ 

     } 
    } 
}

這是我的代碼。我似乎無法使用kXML運行LWUIT。有一個論壇帖子說，我需要在Display.init(this)行之後初始化圖形對象。但那條線應該在哪裏呢？請幫助我...

來源

2010-08-23 Kevin Tan

Display.init（your_midlet）負責初始化LWUIT的Display，不需要自己做。只有限制是，您必須在使用任何表單之前初始化顯示。招行

form1 = new Form("Feeds List")

行

Display.init(this);

所以你初始化顯示初始化後的形式在構造後！

來源

2010-09-02 07:06:11 endevour

LWUIT和使用kXML解析器

回答

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