server = "192.168.0.100";
        port = 21;
        user = "anonymous";
        pass = "anonymous";


ftpConnect(server, user, pass, port);
        ftpPrintFilesList("/");
        ftpChangeDirectory("/datalogger/");
        ftpPrintFilesList("/datalogger/");
        ftpDownload("/datalogger/", Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getPath());
        ftpDisconnect();



 public boolean ftpConnect(String host, String username, String password, int port)
    {
        try {
            ftpClient = new FTPClient();
            // connecting to the host
            ftpClient.connect(host, port);

            // now check the reply code, if positive mean connection success
            if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
                ftpClient.enterLocalPassiveMode();
                // login using username & password
                boolean status = ftpClient.login(username, password);

            /* Set File Transfer Mode
             *
             * To avoid corruption issue you must specified a correct
             * transfer mode, such as ASCII_FILE_TYPE, BINARY_FILE_TYPE,
             * EBCDIC_FILE_TYPE .etc. Here, I use BINARY_FILE_TYPE
             * for transferring text, image, and compressed files.
             */
                ftpClient.setFileType(org.apache.commons.net.ftp.FTP.ASCII_FILE_TYPE);
                ftpClient.enterLocalPassiveMode();
                Log.d(TAG, "Buffer Size:" + ftpClient.getBufferSize());
                this.ftpClient.setBufferSize(1024 * 1024);
                Log.d(TAG, "Buffer Size:" + ftpClient.getBufferSize());
                ftpClient.setAutodetectUTF8(true);
                return status;
            }
        } catch(Exception e) {
            Log.d(TAG, "Error: could not connect to host " + host );
        }


        return false;
    }


    public void ftpPrintFilesList(String dir_path)
        {
            try {
                FTPFile[] ftpFiles = ftpClient.listFiles(dir_path);
                int length = ftpFiles.length;

                for (int i = 0; i < length; i++) {
                    String name = ftpFiles[i].getName();
                    boolean isFile = ftpFiles[i].isFile();

                    if (isFile) {
                        Log.i(TAG, "File : " + name);
                    }
                    else {
                        Log.i(TAG, "Directory : " + name);
                    }
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
        }