package com.example.ftp;

import android.util.*;
import android.app.Activity;
import org.apache.commons.net.ftp.*;

public class MainActivity extends Activity{
 
//Now, declare a public FTP client object.
private FTPClient mFTPClient = null;

//Method to connect to FTP server:
 
public boolean ftpConnect(String host, String username, String password, int port){
    try {
        mFTPClient = new FTPClient();
        // connecting to the host
        mFTPClient.connect("192.168.30.222", 21);

  // now check the reply code, if positive mean connection success
        if (FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())) {
            // login using username & password
            boolean status = mFTPClient.login("test", "1234");

            /* 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.
             */
            mFTPClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            mFTPClient.enterLocalPassiveMode();

            return status;
        }
    } catch(Exception e) {
        Log.d("TAG", "Error: could not connect to host " + host );
    }

    return false;
}

//Method to disconnect from FTP server:

public boolean ftpDisconnect()
{
  try {
      mFTPClient.logout();
      mFTPClient.disconnect();
      return true;
  } catch (Exception e) {
      Log.d("TAG", "Error occurred while disconnecting from ftp server.");
  }

  return false;
}

//Method to get current working directory:

public String ftpGetCurrentWorkingDirectory()
{
  try {
      String workingDir = mFTPClient.printWorkingDirectory();
      return workingDir;
  } catch(Exception e) {
      Log.d("TAG", "Error: could not get current working directory.");
  }

  return null;
}

//Method to change working directory:

public boolean ftpChangeDirectory(String directory_path)
{
  try {
      return mFTPClient.changeWorkingDirectory(directory_path);
  } catch(Exception e) {
      Log.d("TAG", "Error: could not change directory to " + directory_path);
  }

  return false;
}

//Method to list all files in a directory:

public void ftpPrintFilesList(String dir_path)
{
  try {
      FTPFile[] ftpFiles = mFTPClient.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();
  }
}

//Method to create new directory:

public boolean ftpMakeDirectory(String new_dir_path)
{
  try {
      boolean status = mFTPClient.makeDirectory(new_dir_path);
      return status;
  } catch(Exception e) {
      Log.d("TAG", "Error: could not create new directory named " + new_dir_path);
  }

return false;
}

//Method to delete/remove a directory:

public boolean ftpRemoveDirectory(String dir_path)
{
  try {
      boolean status = mFTPClient.removeDirectory(dir_path);
      return status;
  } catch(Exception e) {
      Log.d("TAG", "Error: could not remove directory named " + dir_path);
  }

  return false;
}

//Method to delete a file:

public boolean ftpRemoveFile(String filePath)
{
  try {
      boolean status = mFTPClient.deleteFile(filePath);
      return status;
  } catch (Exception e) {
      e.printStackTrace();
  }

  return false;
}

//Method to rename a file:

public boolean ftpRenameFile(String from, String to)
{
  try {
      boolean status = mFTPClient.rename(from, to);
      return status;
  } catch (Exception e) {
      Log.d("TAG", "Could not rename file: " + from + " to: " + to);
  }

  return false;
}

//Method to download a file from FTP server:

/**
* mFTPClient: FTP client connection object (see FTP connection example)
* srcFilePath: path to the source file in FTP server
* desFilePath: path to the destination file to be saved in sdcard
*/
public boolean ftpDownload(String srcFilePath, String desFilePath)
{
  boolean status = false;
  try {
      FileOutputStream desFileStream = new FileOutputStream(desFilePath);;
      status = mFTPClient.retrieveFile(srcFilePath, desFileStream);
      desFileStream.close();

      return status;
  } catch (Exception e) {
      Log.d("TAG", "download failed");
  }

  return status;
}

//Method to upload a file to FTP server:

/**
* mFTPClient: FTP client connection object (see FTP connection example)
* srcFilePath: source file path in sdcard
* desFileName: file name to be stored in FTP server
* desDirectory: directory path where the file should be upload to
*/
public boolean ftpUpload(String srcFilePath, String desFileName, String desDirectory)
{
  boolean status = false;
  try {
      FileInputStream srcFileStream = new FileInputStream(srcFilePath);

      // change working directory to the destination directory
      if (ftpChangeDirectory(desDirectory)) {
          status = mFTPClient.storeFile(desFileName, srcFileStream);
      }

      srcFileStream.close();
      return status;
  } catch (Exception e) {
      Log.d("TAG", "upload failed");
  }

  return status;
}
}
=============================================================================================================

예제 소스 보면서 오류 수정해서 완성시켰는데요..

실행하니까 그냥 하얀 화면만 나와야되는데..

어떻게해야하나요?

대충 예제소스는 탐색기 형식으로 ftp 연결하는건데 보여지는게 없네요..

대충 소스내용은 ftp 연결/로그인/파일업로드/이름바꾸기/삭제 등 이넫..

책보면서 이제 갓 안드로이드 공부하는데.. 띄엄띄엄 예제소스만보니 역시 어렵게만 느껴지네요.