Android Java Read With BufferedReader Parallel And

问题:

My Dears, I'm flighting to can read multiple CSV Files from Google Cloud Firebase Store.

I'm doing that:

new GetCompaniesCsvFile().execute("companies.csv");

and

new GetLinesCsvFile().execute("lines.csv");

Both Classes Does that:

    private static class GetLinesCsvFile
        extends AsyncTask<String, Integer, Reader>
    {
        @Override
        protected Reader doInBackground(String... tableName) {
            return getLinesCsvFile(tableName[0]);
        }

        @Override
        protected void onPostExecute(Reader reader) {
            importLinesFromCsv(reader);
        }
    }

    private static void importLinesFromCsv(Reader reader) {
        try {
            CsvReader csvReader = new CsvReader(reader);
            // nextLine[] is an array of values from the line
            while (csvReader.getHasNext()) {
                csvReader.readNext(linesStringArray);
            }
        } catch (Exception ex) {
            Log.d("CsvUtil", ex.getMessage());
        }
    }

My readNext(List list) Method Does That:

private static final class GetNextLine extends AsyncTask<Void, Integer, String>
implements ParseLine.TaskDelegate {

        private List<String[]> list;

        public GetNextLine(List<String[]> l) {
            list = l;
        }

        @Override
        protected String doInBackground(Void... companies) {
            try {
                return getNextLine();
            } catch (IOException ex) {
                Log.e("CsvReader", ex.getMessage());
            }
            return null;
        }

        @Override
        protected void onPostExecute(String nextLine) {
            if (nextLine != null) {
                ParseLine parseLine = new ParseLine(this);
                parseLine.execute(nextLine);
            }
        }

        @Override
        public void onTaskEndWithResult(String[] parseLine) {
            list.add(parseLine);
        }
    }

And ParseLine Class That:

    public static final class ParseLine extends AsyncTask<String, Integer, String[]> {
        private TaskDelegate delegate;

        public ParseLine(TaskDelegate delegate) {
            this.delegate = delegate;
        }

        public interface TaskDelegate {
            public void onTaskEndWithResult(String[] parseLine);
        }

        @Override
        protected String[] doInBackground(String... nextLine) {
            try {
                return parseLine(nextLine[0]);
            } catch (IOException ex) {
                Log.e("CsvReader", ex.getMessage());
            }
            return null;
        }

        @Override
        protected void onPostExecute(String[] parseLine) {
            if (parseLine != null && delegate != null)
                delegate.onTaskEndWithResult(parseLine);
        }
    }

Just Read Only the First File and I need read 2 CSV Files with Some Lines and Some Fields, but the application can read only one file with AsyncTask, may you help me please, I lost a lot of hours in this issue, Help me please, Thanks a lot.