(Chilkat for Android™ API)
Automatically Determine FTP Proxy Method

Tries each of the five possible ProxyMethod settings and returns the value (1-5) of the ProxyMethod that succeeded.

Download: Chilkat for Android™ Java Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {
  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView tv = new TextView(this);
    String outStr = "";

    CkFtp2 ftp = new CkFtp2();

    boolean success;

    //  Any string unlocks the component for the 1st 30-days.
    success = ftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        outStr += ftp.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    ftp.put_Hostname("www.example-code.com");
    ftp.put_Username("example-code.com");
    ftp.put_Password("****");

    ftp.put_ProxyHostname("ftp.myproxyhost.com");
    ftp.put_ProxyPort(21);
    //  Note: Your FTP Proxy server may or may not require authentication.
    ftp.put_ProxyUsername("myProxyUsername");
    ftp.put_ProxyPassword("myProxyPassword");

    //  The ProxyMethod should be an integer value between 1 and 5.
    //  If you know your FTP proxy server's authentication scheme,
    //  you may set it directly.  To determine the ProxyMethod,
    //  call DetermineProxyMethod.  A return value of -1 indicates a failure.
    //  A return value of 0 indicates that nothing worked.
    //  A return value of 1-5 indicates the ProxyMethod that was
    //  successful, and this should be the value used for the ProxyMethod
    //  property.

    int pMethod;
    pMethod = ftp.DetermineProxyMethod();
    outStr += pMethod + "\n";

    ftp.Disconnect();
    tv.setText(outStr);
    setContentView(tv);
  }

  static {
      // Important: Make sure the name passed to loadLibrary matches the shared library
      // found in your project's libs/armeabi directory.
      //  for "libchilkat.so", pass "chilkat" to loadLibrary
      //  for "libchilkatemail.so", pass "chilkatemail" to loadLibrary
      //  etc.
      // 
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}