Example Save XML

 public void SaveNotas(Context c,String dir)
    {
        XmlSerializer serializer = Xml.newSerializer();
        StringWriter writer = new StringWriter();
        File file = new File(c.getFilesDir(), dir);
        String Campo;
        String Valor;
        try
        {
            FileOutputStream outputStream = new FileOutputStream(file);
            serializer.setOutput(writer);
            serializer.startDocument("UTF-8", true);
            serializer.startTag("", "root");
            for(XMLObject O : Obj)
            {
                serializer.startTag("","Nota");
                for(CPValor C : O.GetCampos())
                {
                    Campo = C.GetCampo();
                    Valor = C.GetValor();
                    serializer.startTag("",Campo);
                    serializer.text(Valor);
                    serializer.endTag("",Campo);
                }
                serializer.endTag("","Nota");
            }
            serializer.endTag("", "root");
            serializer.endDocument();
            outputStream.write(writer.toString().getBytes());
            writer.close();
            outputStream.close();
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }