android中的xml验证器(xsd)

Question

我有一个在Android中使用API10(2.3.3版本）的项目，我有一个问题是用xsd文件验证xml。这是我的代码：

public static Document buildDoc(String xml, String xsd){
     // parse an XML document into a DOM tree
    Document document = null;

   try {            

       DocumentBuilderFactory parserFactory = DocumentBuilderFactory.newInstance();
        parserFactory.setNamespaceAware(true);
        DocumentBuilder parserdb = parserFactory.newDocumentBuilder();
        doc = parserdb.parse(new InputSource( new StringReader(xml)  ));

       SchemaFactory factory = SchemaFactory.newInstance(
                      XMLConstants.W3C_XML_SCHEMA_NS_URI);     //here the emulator raises an exception


        Source schemaFile = new StreamSource(new File(xsd));
        Schema schema = factory.newSchema(schemaFile);


        Validator validator = schema.newValidator();

        // validate the DOM tree
        validator.validate(new DOMSource(doc));
        System.out.println("Validation OK!");
    } catch (SAXException e) {
        // instance document is invalid!
             System.err.println("Validation ERROR!");
            e.printStackTrace();

    } catch (ParserConfigurationException e) {
                    // TODO Auto-generated catch block
             System.err.println("Validation ERROR!");
                    e.printStackTrace();
    } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
             System.err.println("Validation ERROR!");              
            } catch (IOException e) {
                    // TODO Auto-generated catch block
                     System.err.println("Validation ERROR!");
                    e.printStackTrace();

            }

    return doc;

}

我的Eclipse模拟器抛出一个异常：E/AndroidRuntime（4770）：由：java.lang.IllegalArgumentException引起：http://www.w3.org/2001/XMLSchema

在这一行中：SchemaFactory factory=SchemaFactory.newInstance(XMLConstants.w3c_XML_Schema_NS_URI)；

为什么？？

Answer 1

因为您的平台不支持XML模式。