求助：向xml中添加数据时怎么能不覆盖已有数据？

 public void saveInstall_Collection_Record_Info(List<Install_Collection_Info> mICInfos, Writer writer) throws Throwable{

                XmlSerializer serializer = Xml.newSerializer();

                serializer.setOutput(writer);

                serializer.startDocument("UTF-8", true);

                

                serializer.startTag(null, "result");

                for(Install_Collection_Info mICInfo : mICInfos){

                        serializer.startTag(null, "record");

                        serializer.attribute(null, "appid", mICInfo.getAppid()+"");

                        

                        serializer.startTag(null, "appname");

                        serializer.text(mICInfo.getAppname());

                        serializer.endTag(null, "appname");

                        

                        serializer.startTag(null, "version");

                        serializer.text(mICInfo.getVersion());

                        serializer.endTag(null, "version");



                        serializer.startTag(null, "pkgName");

                        serializer.text(mICInfo.getPkgName());

                        serializer.endTag(null, "pkgName");

                        

                        serializer.endTag(null, "record");

                }

                serializer.endTag(null, "result");                

                serializer.endDocument();

                writer.flush();

                writer.close();

        }

 public void saveInstall_Collection_Status(int appid,String appname,String version,String pkgName) throws Throwable{



                List<Install_Collection_Info> mICInfos = new ArrayList<Install_Collection_Info>();

                mICInfos.add(new Install_Collection_Info(appid, appname, version,pkgName));

                File file = new File(MyApplication.getAppContext().getFilesDir(),"Install_Collection_Info.xml");

                FileOutputStream outStream = null;

                if(!(file.exists() && file.isFile()))//文件不存在，创建文件，否则，直接写文件

                        outStream = MyApplication.getAppContext().openFileOutput("Install_Collection_Info.xml",Context.MODE_PRIVATE);

                OutputStreamWriter writer = new OutputStreamWriter(outStream, "UTF-8");

                BufferedWriter bWriter = new BufferedWriter(writer);                

                saveInstall_Collection_Record_Info(mICInfos, bWriter);                                

        }

补充：Java ,  Java相关

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