title: Upload or Download from/to ftp server: Android Client
body: <p>I'm working on android project to test FTP functions both upload or download files.
  Here's my first try code based on <a href="http://www.jibble.org/simpleftp/" rel="nofollow">this</a> tutorial:</p>
  
  <pre><code>public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  
      try {
          SimpleFTP ftp = new SimpleFTP();
  
          // Connect to an FTP server on port 21.
          ftp.connect("ftp.olympe-network.com", 21, "username", "password");
  
  
          // Set binary mode.
          ftp.bin();
  
          // Change to a new working directory on the FTP server.
          ftp.cwd("web");
  
          // Upload some files.
          ftp.stor(new File("shirt.jpg"));
          //ftp.stor(new File("comicbot-latest.png"));
  
          // You can also upload from an InputStream, e.g.
          ftp.stor(new FileInputStream(new File("shirt.jpg")), "shirt.jpg");
          /*ftp.stor(someSocket.getInputStream(), "blah.dat");
          */
  
          // Quit from the FTP server.
          ftp.disconnect();
      }
      catch (IOException e) {
          // Jibble.
      }
  }
  </code></pre>
  
  <p>My shirt.jpg file is store in the main project folder.i am using emulator not a physical device. I didn't have error in my log, but the file is not uploaded.</p>
  
  <p>Then, i changed to another approach:</p>
  
  <pre><code>private void loadLogs() {
      //radBtn.addView(null);
      new processTask().execute();
  }
  private class processTask extends AsyncTask&lt;String, Void, Void&gt;{
      private ProgressDialog Dialog = new ProgressDialog(activitiMain.this);
       private TextView log; 
       private  Spinner s;
      protected void onPreExecute() {
          Dialog.setMessage("Loading...");
          Dialog.show();
      }
      @Override
      protected Void doInBackground(String... arg0) {
          FTPClient client = new FTPClient();
          try {
          SharedPreferences myPref = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
          String ipaddr = myPref.getString("etServer", "");
          String port= myPref.getString("port", "21");
          String logFile= myPref.getString("logfname", "error_log");
          String filePath= myPref.getString("path", "/public_html");
          String uname= myPref.getString("uname", "");
          String pass= myPref.getString("pass", "");
          client.connect(ipaddr,21);
          client.enterLocalPassiveMode();
          boolean login = client.login(uname, pass);
          client.changeWorkingDirectory(filePath);
          System.out.println(client.printWorkingDirectory());
  
          BufferedReader reader = null;
          String line = null;
          sv = new ScrollView(activitiMain.this);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
          sv.setLayoutParams(LP_FF);
          LinearLayout loglay  =  new LinearLayout(activitiMain.this);
          loglay.setOrientation( LinearLayout.VERTICAL );  //FTPFile[] ftpFiles = client.listFiles();
          FTPFile[] ftpFiles = client.listFiles();
          ArrayList&lt;String&gt; name = new ArrayList&lt;String&gt;();                              
          ArrayAdapter &lt;CharSequence&gt; adapter =new ArrayAdapter &lt;CharSequence&gt; (getBaseContext(), android.R.layout.simple_spinner_item );
              adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  
               adapter.add("Select File");*/      
              //s = new (Spinner)findViewById(R.id.Spinner01);
              s = new Spinner(activitiMain.this);
              for (int i = 0; i &lt; ftpFiles.length; i++) { 
                  String fname =ftpFiles[i].getName();
                  Log.i("FTP", "File " +i +" : "+fname);
                         name.add(fname);
                          long length = ftpFiles[i].getSize();
                          //adapter2.add(ftpFiles[i].getName());
                          //String readableLength = FileUtils.byteCountToDisplaySize( length );
                          ///System.out.println( name + ":\t\t" + readableLength );  
                      }
              //String [] strArray =null;
              //strArray.toArray(name);
              String [] files = name.toArray(new String[name.size()]);
              @SuppressWarnings("unchecked")
              ArrayAdapter&lt;Object&gt; adapter2 = new ArrayAdapter&lt;Object&gt;(getApplicationContext(), android.R.layout.simple_spinner_item,files);  
               adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  
               s.setAdapter(adapter2);  
               loglay.addView(s);
  
           Log.i("Files", ftpFiles.toString());
              for (FTPFile ftpFile : ftpFiles) {
                  String fileName = ftpFile.getName(); 
                  if (fileName.equals(logFile)){
                       try {
                           InputStream stream = client.retrieveFileStream(fileName);                             
                           reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
                           //line = reader.readLine();
  
  
                           while ((line = reader.readLine())!= null &amp;&amp; line.trim().length()&gt;0) {
                                  //System.out.println(line);
                               log = new TextView(activitiMain.this);
                                  String trail = line; 
                                  log.setTextColor(Color.GREEN);                                                                                                                                                                                                                                                                                                                                 
                                  log.setPadding(10, 5, 0, 5);
                                  log.setText(trail);                                                                                                                                                                                                                                                                                                                                   
                                  loglay.addView(log);    
                              }
                           sv.addView(loglay);
                       } finally {
                           if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}
                       }
                  }
              }
                 client.logout();
  
  
          } catch (IOException e) {
              e.printStackTrace();
          } finally {
              try {
                  client.disconnect();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return null;
      }
      protected void onPostExecute(Void unused) {
          Dialog.dismiss();
          setContentView(sv);
          }
  </code></pre>
  
  <p>In my preference screen, i specified the ftp server parameters, but i got also an error in my logcat:</p>
  
  <pre><code>    05-27 18:36:38.237: ERROR/AndroidRuntime(585): FATAL EXCEPTION: main
  05-27 18:36:38.237: ERROR/AndroidRuntime(585): java.lang.NullPointerException
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.view.ViewGroup.addViewInner(ViewGroup.java:1969)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.view.ViewGroup.addView(ViewGroup.java:1865)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.view.ViewGroup.addView(ViewGroup.java:1845)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:217)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.app.Activity.setContentView(Activity.java:1658)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.sam.remote.activitiMain$processTask.onPostExecute(activitiMain.java:160)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.sam.remote.activitiMain$processTask.onPostExecute(activitiMain.java:1)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.AsyncTask.finish(AsyncTask.java:417)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.AsyncTask.access$300(AsyncTask.java:127)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.Handler.dispatchMessage(Handler.java:99)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.Looper.loop(Looper.java:123)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.app.ActivityThread.main(ActivityThread.java:4627)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at java.lang.reflect.Method.invokeNative(Native Method)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at java.lang.reflect.Method.invoke(Method.java:521)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>