Question

我尝试使用xml解析器构建应用程序。

ex：http://www.androidpeople.com/android-xml-parsing-tutorial-using-saxparser

但是我想从EditText解析xml文件，它是如何工作的？

Answer 1

更改此行：

xr.parse(new InputSource(sourceUrl.openStream()));

到

String xmlString = editText.getText().toString();
StringReader reader = new StringReader(xmlString);
xr.parse(new InputSource(reader));

Answer 2

您有几种方法可以解析XML，最常用的是SAX和DOM。选择非常具有战略性as explained in this paper。

以下是SAX的简短说明：

您需要一些import s：

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
import android.util.Xml;

创建自己的XML SAX DefaultHandler：

class MySaxHandler extends DefaultHandler {
    // Override the methods of DefaultHandler that you need.
    // See [this link][3] to see these methods.
    // These methods are going to be called while the XML is read
    // and will allow you doing what you need with the content.
    // Two examples below:

    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
         // This is called each time an openeing XML tag is read.
         // As the tagname is passed by parameter you know which tag it is.
         // You also have the attributes of the tag.
         // Example <mytag myelem="12"> will lead to a call of
         // this method with the parameters:
         // - localName = "mytag"
         // - attributes = { "myelem", "12" }  
    }

    public void characters(char[] ch, int start, int length) throws SAXException {
         // This is called each time some text is read.
         // As an example, if you have <myTag>blabla</myTag>
         // this will be called with the parameter "blabla"
         // Warning 1: this is also called when linebreaks are read and the linebreaks are passed
         // Warning 2: you have to memorize the last open tag to determine what tag this text belongs to (I usually use a stack).
    }
}

从String中将XML解压缩为EditText。我们称之为xmlContent

创建并初始化XML解析器：

final InputStreamReader reader = new InputStreamReader(new ByteArrayInputStream(xmlContent.getBytes()));
final MySaxHandler handler = new MySaxHandler();

然后，让解析器读取XML内容。这将导致您的MySaxHandler在阅读过程中调用其各种方法。
```
Xml.parse(reader, handler);
```

如何从EditText解析xml？

2 个答案: