(Chilkat for Android™ API)
Restart/Resume FTP Download

Resume downloading a file from an FTP server.

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("ftp.chilkatsoft.com");
    ftp.put_Username("****");
    ftp.put_Password("****");

    //  Connect and login to the FTP server.
    success = ftp.Connect();
    if (success != true) {
        outStr += ftp.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Change to the remote directory where the file is located.
    //  This step is only necessary if the file is not in the root directory
    //  for the FTP account.
    success = ftp.ChangeRemoteDir("temp");
    if (success != true) {
        outStr += ftp.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  To resume a download, it is assumed that the partial file
    //  is already present on the local filesystem.
    //  You only need to set the RestartNext property to resume
    //  the download.  The Chilkat FTP component sets the resume
    //  point by getting the existing size of the target (local) file.
    ftp.put_RestartNext(true);

    String localFilename;
    localFilename = "big.zip";
    String remoteFilename;
    remoteFilename = "big.zip";

    //  Resume downloading...
    success = ftp.GetFile(remoteFilename,localFilename);
    if (success != true) {
        outStr += ftp.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    ftp.Disconnect();

    outStr += "File Downloaded!" + "\n";
    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."
  }
}