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
コーディング：
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){
}
}
}
これは私のコードです。kXML で LWUIT を実行できないようです。行の後にグラフィックス オブジェクトを初期化する必要があるというフォーラムの投稿がありますDisplay.init(this)。しかし、その線はどこにあるべきでしょうか? 助けてください...