Java Ftpclient Application Doesn't Connect

I am new to android and java programing. I write following code to connect to ftp server public class NewMainActivity extends Activity { TextView Display; //declare a public FTP cl

Solution 1:

I've tried your code and it works ok. Based on the response code you're getting I assume the connection to the server has not been even established. Make sure you have granted your app with INTERNET permission in the manifest file:

<uses-permissionandroid:name="android.permission.INTERNET" />

EDIT: From the exception stack trace it's clear, that you're trying to execute this code from a main thread. In Android 3.0 (Honeycomb) or later you're not permitted to execute any network call in UI thread by default. The reason is simple: network call may block for an indefinite amount of time, effectively freezing application UI. You have two options how to fix it:

Lazy way - Disable therad check for network calls:

StrictMode.ThreadPolicypolicy=newStrictMode.ThreadPolicy.Builder()
                                     .permitAll()
                                     .build();   
StrictMode.setThreadPolicy(policy);

You can always enable thread checks again using

StrictMode.ThreadPolicypolicy=newStrictMode.ThreadPolicy.Builder()
                                     .detectAll()
                                     .penaltyLog()
                                     .penaltyDeath()
                                     .build();
StrictMode.setThreadPolicy(policy);

Proper way - execute FTP calls from a background worker thread using AsyncTask. Take a look here for examples and comprehensive explanation about AsyncTasks.