How to parse XML with sax in java / android ?

public Document getDomElement(String xml) {
        Document doc = null;
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {

            DocumentBuilder db = dbf.newDocumentBuilder();

            InputSource is = new InputSource();
            is.setEncoding("ISO-8859-1"); //UTF-8 or 16
            is.setCharacterStream(new StringReader(xml));
            doc = db.parse(is);
            //doc = db.parse(new ByteArrayInputStream(xml.getBytes()));

        }
        catch (ParserConfigurationException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        }
        catch (SAXException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        }
        catch (IOException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        }
        return doc;
    }