Writing to XML file in Android

Question

I'm trying to write to an XML file, within my XML file I have:

<user>
   <name></name>
</user>

And the method I can to write to the XML file:

public void WriteToXML() throws ParserConfigurationException, IOException, SAXException {
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
    Document doc = dBuilder.parse(inputStream);
    Element element = doc.getDocumentElement();
    element.normalize();
    NodeList nList = doc.getElementsByTagName("user");
    Node node = nList.item(0);

    if (node.getNodeType() == Node.ELEMENT_NODE) {

        Element element2 = (Element) node;
        if(element2.getTagName() == "name")
        {
            element2.setNodeValue("SFDSFSDF");
        }

    }
}

However, the method gets called but for some reason it doesnt actually write to the XML file because when I read it their isn't actually anything within the XML?

@cricket_007 How would I declare which tag to insert in? Since I may have multiple tags within — KTOV, Dec 05 '16 at 22:14
That's just not how to [compare strings in Java](http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java) — OneCricketeer, Dec 05 '16 at 22:15
@cricket_007 Okay, I replaced it.. do you have any idea why it still doesn't work? — KTOV, Dec 05 '16 at 22:17
I'm guessing that `element2.setNodeValue` changes the value in memory. No part of your code modifies or writes to the file — OneCricketeer, Dec 05 '16 at 22:25

score 0 · Answer 1 · edited Dec 06 '16 at 00:32

0

Try to replace :

element2.getTagName() == "name"

by :

(element2.getTagName()).equals("name")

Also, try to replace :

element2.setNodeValue("SFDSFSDF");

by :

element2.setTextContent("SFDSFSDF");  //adds content

edited Dec 06 '16 at 00:32

answered Dec 05 '16 at 22:41

Belbahar Raouf

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This wont actually write to the xml file right? it would just change in memory? – KTOV Dec 05 '16 at 22:49
The getNodeValue() / setNodeValue() methods work differently depending on what type of Node you have. – Belbahar Raouf Dec 05 '16 at 23:01
So how do i actually write to the file – KTOV Dec 05 '16 at 23:04
setNodeValue() works on Text Nodes. If the node is an Element then setting nodeValue does nothing. – Belbahar Raouf Dec 05 '16 at 23:05
Like i said in the answer, to write in the node, you have to replace element2.setNodeValue("YOUR TEXT"); by element2.setTextContent("YOUR TEXT"); – Belbahar Raouf Dec 05 '16 at 23:09
I understand, I've done this.. but it doesn't actually write the xml file when I load the XML file – KTOV Dec 05 '16 at 23:21

Writing to XML file in Android

1 Answers1