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问题：XML解析返回空指针异常，无法从xml中的程序标签中检索到文本。单步执行代码显示：（这是来自调试语句，如下面的代码所示）

err StartTag entry
err StartTag record
err Text 4

调用 parser 的行（也是导致 nullpointer 的行，pail 是一个新创建的容器）：

pail = XmlParsee.parsee(getResources().openRawResource(R.raw.testprogramlist));

我的 XML 文件：

<entry>
    <record>
        <program>Program 1(English)</program>
    </record>
    <record>
        <program>Program 2(Mandarin)</program>
    </record>
</entry>

我的解析器（我尝试了 getText() 和 nextText()，都返回相同的问题）：

public class XmlParsee {
// jealousy has invaded! Generic xml parser that returns a container
public static Container parsee(InputStream inputriver) {
    Container container = null;

    try {
        // get new parser object from factory
        XmlPullParser parsee = XmlPullParserFactory.newInstance().newPullParser();
        parsee.setInput(inputriver, null);

        int eventType = parsee.getEventType();
        // while xml still has more, we read.

        while (eventType != XmlPullParser.END_DOCUMENT) {
            switch (eventType) {
                case XmlPullParser.START_DOCUMENT: {
                    //these comments to be replaced with logging functions, if you desire
                    //wokay, we begin
                    container = new Container();
                    System.err.println("doc start");
                    break;
                }
                case XmlPullParser.END_DOCUMENT:{
                    //wokay, we end.
                    break;
                }
                case XmlPullParser.START_TAG:{
                    //new tag! first we get the tag's name
                    String tag = parsee.getName();
                    System.err.println("StartTag "+parsee.getName());
                    //then we check, individually, what the tag is to confirm content
                    //if <program>
                    if(tag.equalsIgnoreCase(Container.PROGRAM)){
                        System.err.println("Text "+parsee.TEXT);
                        //container.addProgramList(parsee.getText());
                    }
                    //if <>                     
                    break;
                }
            }
            //done with this line, next!
            eventType = parsee.next();
        }
    } catch (Exception e) {
        container = null;
    }

    return container;
}

有任何想法吗？从早上开始我就一直在敲我的头=\

4

1 回答 1

1

nextText() 对我有用；

    //System.err.println("Text "+parsee.TEXT);
    System.err.println("Text "+parsee.nextText());

输出：

...
09-13 14:51:22.035: W/System.err(12080): doc start
09-13 14:51:22.035: W/System.err(12080): StartTag entry
09-13 14:51:22.045: W/System.err(12080): StartTag record
09-13 14:51:22.065: W/System.err(12080): StartTag program
09-13 14:51:24.285: W/System.err(12080): Text Program 1(English)
09-13 14:56:57.505: W/System.err(12080): StartTag record
09-13 14:56:57.515: W/System.err(12080): StartTag program
09-13 14:56:58.075: W/System.err(12080): Text Program 2(Mandarin)
...

问候

陈子腾

于 2012-09-13T06:57:53.193 回答