我已经从外部存储中提取了所有PDF文件，并在我的应用程序回收视图中显示它们，但现在我有问题，我想从一些特定的文件夹中提取所有PDF文件，并在我的应用程序的回收视图中显示它们，有没有可能的方法从特定的目录中提取？
这个功能将完全罚款和提取所有文件从存储，但我不想提取所有从外部存储我想这样做从一些特定的目录这个功能将给予我的所有pdf文件在我的外部存储列表我想在这个功能中做一些改变，但我不知道如何？

/**
 * reading SD card from this function
 *
 */
private List<PdfModel> ReadSDcard()
{
    List<PdfModel> myList = new ArrayList<>();
    String[] projection = {MediaStore.Files.FileColumns.DATA,
            MediaStore.Files.FileColumns.DATE_ADDED,
            MediaStore.Files.FileColumns.DISPLAY_NAME,
            MediaStore.Files.FileColumns.MIME_TYPE,
            MediaStore.Files.FileColumns.DATE_MODIFIED
    };

    final String selection = MediaStore.Files.FileColumns.MIME_TYPE +" = ?";
    String pdf = MimeTypeMap.getSingleton().getMimeTypeFromExtension("pdf");
    String[] selectionArgs = new String[]{pdf};

    Uri collection;
    if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.Q)
    {
//        collection = MediaStore.Downloads.getContentUri("external");
        collection = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY);
//        collection = MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL+"/"+"Abbas_1122");
        Log.e(TAG, "ReadSDcard: path______________________________________________"+collection );
        myList.addAll( getListOfPdfFiles(collection, projection, selection, selectionArgs));
    }
    else
    {
//        collection = MediaStore.Files.getContentUri(Environment.getExternalStorageDirectory().getAbsolutePath()+"/myFolder_1122/");  _________"myFolder_1122" this is the folder which i have created
//        collection = MediaStore.Files.getContentUri("external");//this will work for fetching all files from external below API level 30
        collection = MediaStore.Files.getContentUri("//media//storage/emulated/0/Abbas_1122/");//this will work for fetching all files from external below API level 30
        Log.e(TAG, "ReadSDcard: path ______________________________________________ "+collection );
        Toast.makeText(this, "collection: "+collection.toString(), Toast.LENGTH_SHORT).show();

        myList.addAll( getListOfPdfFiles(collection, projection, selection, selectionArgs));

    }
    return myList;
}

    private List<PdfModel> getListOfPdfFiles(Uri collection, String[] projection, String selection, String[] selectArgs)
    {
        List<PdfModel> pdfList = new ArrayList<>();
        try {
            Cursor cursor = getApplicationContext().getContentResolver().query(collection, projection,selection, selectArgs,null);
            if (cursor.moveToFirst())
            {
                int columIndex = cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATA);
                do {
                    try {
                        File file = new File(cursor.getString(columIndex));
                        String fileName = file.getName();
                        PdfModel pdfModel = new PdfModel(fileName, "129", 0, "pdf", file.getPath());
                        pdfList.add(pdfModel);
                    }
                    catch (Exception e)
                    {
                        e.printStackTrace();
                    }
                }while (cursor.moveToNext());
            }
            cursor.close();
        }catch (Exception e)
        {
            e.printStackTrace();
        }
        return pdfList;
    }