async task buffered reader

package id.pptik.bawaslubatch.helpers;

import android.os.AsyncTask;
import android.os.Environment;
import android.os.Handler;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import id.pptik.bawaslubatch.features.FileTransfer;

public class DownloadCSV extends AsyncTask<String, Void, BufferedReader> {

    private String domain = "";
    private int port = 21;
    private String user = "";
    private String pass = "";
    private String filepath = "";
    private String destinationpath = "";

    Handler mHandler;

    FileTransfer fileTransfer = new FileTransfer();

    // run async task
    protected BufferedReader doInBackground(String... args) {

        domain = args[0];
        port = Integer.parseInt(args[1]);
        user = args[2];
        pass = args[3];
        filepath = args[4];
        destinationpath = args[5];

        try {
            fileTransfer.downloadAndSaveFile(domain, port, user, pass, filepath, new File(Environment.getExternalStorageDirectory()+destinationpath));
            FileInputStream fis = new FileInputStream(new File(Environment.getExternalStorageDirectory()+destinationpath));
            DataInputStream in = new DataInputStream(fis);
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            in.close();
            return br;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}