Android™

Set a Remote File's Last-Modified Time

Demonstrates the Chilkat SFtp.SetLastModifiedTimeStr method, which sets a remote file's last-modified date and time. The arguments are the remote path (or handle), whether the first argument is a handle, and an RFC 822 formatted date/time string.

Background: Of the three timestamps, the modified time is the one you most often want to set, because sync and build tools compare it to decide what is current. Stamping an uploaded file with its source's modified time keeps a mirror consistent and prevents an incremental sync from needlessly re-copying it. This is the most widely supported timestamp to set across servers.

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Android™

// 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 {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  Demonstrates the SFtp.SetLastModifiedTimeStr method, which sets a remote file's last-modified
    //  date and time.  The 1st argument is the remote path (or handle), the 2nd (bIsHandle) indicates
    //  which, and the 3rd is an RFC 822 formatted date/time string.

    CkSFtp sftp = new CkSFtp();

    //  Connect, authenticate, and initialize the SFTP subsystem.
    int port = 22;
    success = sftp.Connect("sftp.example.com",port);
    if (success == false) {
        Log.i(TAG, sftp.lastErrorText());
        return;
        }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    String password = "mySshPassword";

    success = sftp.AuthenticatePw("mySshLogin",password);
    if (success == false) {
        Log.i(TAG, sftp.lastErrorText());
        return;
        }

    success = sftp.InitializeSftp();
    if (success == false) {
        Log.i(TAG, sftp.lastErrorText());
        return;
        }

    //  The 1st argument is a path, so bIsHandle is false.
    boolean bIsHandle = false;
    String dateTimeStr = "Fri, 10 Jul 2026 20:15:30 -0600";
    success = sftp.SetLastModifiedTimeStr("subdir/report.pdf",bIsHandle,dateTimeStr);
    if (success == false) {
        Log.i(TAG, sftp.lastErrorText());
        return;
        }

    Log.i(TAG, "Last-modified time set.");

    sftp.Disconnect();

  }

  static {
      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."
  }
}