为什么XmlPullParser传递两个START_DOCUMENT事件? [英] Why is XmlPullParser delivering two START_DOCUMENT events?

问题描述

在一个Android应用中，我有一个 XmlPullParser ，

In an Android app I have an XmlPullParser,

XmlResourceParser xrp = c.getResources().getXml(rid);

...(您可以从Android二进制XML资源中看到)...，并且它传递的前两个事件都是 START_DOCUMENT .为什么?那是正常的吗?凭直觉，我假设一个XML文档:=一个XML文档，而不是XML文档的集合.

... (as you can see it's from an Android binary XML resource) ... and the first two events that it delivers are both START_DOCUMENT. Why? Is that normal? Intuitively, I would suppose that an XML document := one XML document, not a collection of XML documents.

我的XML文档/does/具有多个根级别标签:

My XML document /does/ have more than one root-level tag:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE STUFF OTHER STUFF "http://www.mydtd.com/mydtddtdtdtdtdtdtdtandroid">

<realRootTagOfMyDocument  version="9001">
    <otherStuff>
    ...

DOCTYPE行是否算作另一个XML文档?

Does the DOCTYPE line count as another XML document?

(以下是一些测试代码的打印内容:

(Here is what some test code prints:

01-15 14:11:36.000  11566-11566/com.mypkg I/System.out﹕ Start document
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ Start document -1
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ Start document null
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ xrp android.content.res.XmlBlock$Parser@42771098
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ Start document
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ Start document -1
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ Start document null
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ xrp android.content.res.XmlBlock$Parser@42771098
01-15 14:11:36.007  11566-11566/com.mypkg I/System.out﹕ Start tag realRootTagOfMyDocument

...和测试代码:

private static void test(XmlResourceParser xrp) throws XmlPullParserException, IOException {
    int eventType = xrp.getEventType();
    while (eventType != XmlPullParser.END_DOCUMENT) {
        if(eventType == XmlPullParser.START_DOCUMENT) {
            System.out.println("Start document");
            int attributeCount = xrp.getAttributeCount();
            System.out.println("Start document " + attributeCount);
            System.out.println("Start document " + xrp.getText());
            if (attributeCount > 0)
                System.out.println("Start document " + xrp.getAttributeName(0));
            else
                System.out.println("xrp " + xrp);
        } else if(eventType == XmlPullParser.START_TAG) {
            System.out.println("Start tag " + xrp.getName());
        } else if(eventType == XmlPullParser.END_TAG) {
            System.out.println("End tag " + xrp.getName());
        } else if(eventType == XmlPullParser.TEXT) {
            System.out.println("Text " + xrp.getText());
        }
        eventType = xrp.next();
    }
    System.out.println("End document");
    throw new Error();
}

...)

推荐答案

来自 XMLPullParser 文档:

通知解析器位于文档的开头，并且什么都没读.

Signalize that parser is at the very beginning of the document and nothing was read yet.

因此，我想像一下，由于它什么也没读(没有开始标签，结束标签，文档末尾等)，因此它保持状态?

So I'd imagine that since it hasn't read anything (no start tags, end tags, end of document, etc.) it stays in the state?

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