如何在Android上正確縮進XML？

Question

基於StackOverflow上的幾個示例，我有以下用於縮進XML的代碼。 我在String中有一個源xml文件。然而，輸出不是縮進的，但它也不會給出任何錯誤。在調試器中檢查輸出，並且不包含空格或製表符等任何字符，這些字符可能會被錯誤地渲染並因此被忽略。

String input = "xmldata"; 
Source xmlInput = new StreamSource(new StringReader(input)); 

StringWriter stringWriter = new StringWriter(); 
StreamResult xmlOutput = new StreamResult(stringWriter); 
TransformerFactory transformerFactory = TransformerFactory.newInstance(); 

Transformer transformer = transformerFactory.newTransformer(); 

transformer.setOutputProperty(OutputKeys.ENCODING, "utf-8"); 
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no"); 
transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2"); 
transformer.transform(xmlInput, xmlOutput); 
return stringWriter.toString(); 

我自己也嘗試設置indent-amount到"2"，但隨後的應用程序會抱怨一個未知屬性。可能這不是在Android中實現的。

難道我做錯了什麼嗎？是否有其他選項用於從源xml字符串生成縮進xml文件？

Answer 1

你可以嘗試這樣的事情：

String input = "xmldata"; 
InputSource is = new InputSource(new StringReader(input)); 
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
Document doc = dbf.newDocumentBuilder().parse(is); 
System.out.println(prettyPrint(doc)); 

public static final String prettyPrint(Node xml) throws TransformerConfigurationException, TransformerFactoryConfigurationError, TransformerException { 
    StringWriter stringWriter = new StringWriter(); 
    StreamResult out = new StreamResult(stringWriter); 

    Transformer tf = TransformerFactory.newInstance().newTransformer(); 
    tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes"); 
    tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); 
    tf.setOutputProperty(OutputKeys.INDENT, "yes"); 
    tf.transform(new DOMSource(xml), out); 
    return out.getWriter().toString(); 
}