Java / Android-读取，处理XML文件并将其保存到内部存储中

Question

I'm developing an Android Application which will make use of an file System where Data will be stored in xml - files..

I'm successfully reading the according file and altering the Nodes (the Values are changed - if viewing in debugger) but no changes are made to my locally saved file..

Process: 1. Read/open local file //done 2. Change DOM NODE //done 3. Save changes in my local file <- fails

So far I know that I will have to use the TransformerFactory after following some Tutorials and other code snippets the changes are still not saved to my file..

Can someone tell me what I'm doing wrong?

My Code:

try {
        File path = a.getFilesDir();
        DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

        Document doc = docBuilder.parse(path.getPath() + "/" + FILENAME_PERMISSIONS);

        NodeList myCourses = doc.getElementsByTagName(NODE_COURSE);

        for (int i = 0; i < myCourses.getLength(); i++) {
            Node course = myCourses.item(i);
            Element e = (Element)myCourses.item(i);

            Node myPermission = course.getFirstChild();
            String name = e.getAttribute(ATTR_NAME);

            switch (name){
                case FLAG_CrossCult:
                    myPermission.setTextContent(boolToString(crossCult));
                    break;

                case FLAG_KAIROS:
                    myPermission.setTextContent(boolToString(kairos));

                    break;

                case FLAG_UnfinStory:
                    myPermission.setTextContent(boolToString(unfinStory));

                    break;

                case FLAG_EmpToInf:
                    myPermission.setTextContent(boolToString(empToInf));

                    break;

                case FLAG_YouthKairos:
                    myPermission.setTextContent(boolToString(youthKairos));

                    break;
            }

            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            DOMSource source = new DOMSource(doc);

            StreamResult streamResult = new StreamResult(new File(path.getPath() + "/" + FILENAME_PERMISSIONS));
            transformer.transform(source,streamResult);





        }


    }
    catch (ParserConfigurationException e){

    } catch (SAXException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }catch(TransformerConfigurationException e){
        e.printStackTrace();
    } catch (TransformerException e) {
        e.printStackTrace();
    }

Answer 1

I found the Problem ...

The Code was almost correct.. 2 changes needed to be done:

1: need to use "new File()"

String myPath = path.getPath() + "/" + FILENAME_PERMISSIONS;
Document doc = docBuilder.parse(new File(myPath));

2: I was writing to the wrong Node

//Node myPermission = course.getFirstChild();
//is now:

NodeList permissionList = e.getElementsByTagName(NODE_PERMISSION);
Node myPermission = permissionList.item(0);

I'll leave the question here incase someone needs to do the same..