private String writeToFile(String data,String filename) {
        if(isStoragePermissionGranted()){
            Toast.makeText(context,"permission deny",Toast.LENGTH_LONG);
        }
        File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS+"/"+context.getPackageName());
//        File dir = context.getFilesDir();

        if(!dir.exists()){
            dir.mkdirs();
        }
        File file = new File(dir, filename);
        OutputStream out = null;
        try {
            file.createNewFile();
            file.setReadable(true, false);
            file.setExecutable(true, false);
            file.setWritable(true, false);
            out = new FileOutputStream(file);
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(out);
//            File file = new File(context.getFilesDir(), filename);
//            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput(filename, Context.MODE_PRIVATE));
            outputStreamWriter.write(data);
            outputStreamWriter.flush();
            outputStreamWriter.close();
            Log.v("@writeToFile","[Success] "+file.getAbsolutePath());
        }
        catch (IOException e) {
            e.printStackTrace();
            Log.e("Exception", "File write failed: " + e.toString());
        }
        MediaScannerConnection.scanFile(context, new String[] {file.toString()}, null, null); // <-- 이부분 추가된 파일을 이름으로 스캔을 다시 하도록 함
//        context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+Environment.getExternalStorageDirectory())));
        return file.getAbsolutePath();
    }