Writing XML on Android

Question

Given an instance of org.w3c.dom.Document, how do I save its contents to a file/stream?

Answer 1

You can write xml like all others text files. For parsing Document to string I used:

public static String getStringFromNode(Node root) throws IOException {

        StringBuilder result = new StringBuilder();

        if (root.getNodeType() == 3)
            result.append(root.getNodeValue());
        else {
            if (root.getNodeType() != 9) {
                StringBuffer attrs = new StringBuffer();
                for (int k = 0; k < root.getAttributes().getLength(); ++k) {
                    attrs.append(" ").append(
                            root.getAttributes().item(k).getNodeName()).append(
                            "="").append(
                            root.getAttributes().item(k).getNodeValue())
                            .append("" ");
                }
                result.append("<").append(root.getNodeName()).append(" ")
                        .append(attrs).append(">");
            } else {
                result.append("<?xml version="1.0" encoding="UTF-8"?>");
            }

            NodeList nodes = root.getChildNodes();
            for (int i = 0, j = nodes.getLength(); i < j; i++) {
                Node node = nodes.item(i);
                result.append(getStringFromNode(node));
            }

            if (root.getNodeType() != 9) {
                result.append("</").append(root.getNodeName()).append(">");
            }
        }
        return result.toString();
    }

But there is one more simple way to do this: http://www.ibm.com/developerworks/opensource/library/x-android/index.html#list11

private String writeXml(List<Message> messages){
    XmlSerializer serializer = Xml.newSerializer();
    StringWriter writer = new StringWriter();
    try {
        serializer.setOutput(writer);
        serializer.startDocument("UTF-8", true);
        serializer.startTag("", "messages");
        serializer.attribute("", "number", String.valueOf(messages.size()));
        for (Message msg: messages){
            serializer.startTag("", "message");
            serializer.attribute("", "date", msg.getDate());
            serializer.startTag("", "title");
            serializer.text(msg.getTitle());
            serializer.endTag("", "title");
            serializer.startTag("", "url");
            serializer.text(msg.getLink().toExternalForm());
            serializer.endTag("", "url");
            serializer.startTag("", "body");
            serializer.text(msg.getDescription());
            serializer.endTag("", "body");
            serializer.endTag("", "message");
        }
        serializer.endTag("", "messages");
        serializer.endDocument();
        return writer.toString();
    } catch (Exception e) {
        throw new RuntimeException(e);
    } 
}