(Android™) Get the Last-Modified Date Before HTTP Download

Demonstrates how to send a HEAD request to get the last-modified date of a file on a web server (without downloading the file).

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ 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 {

  private static final String TAG = "Chilkat";

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

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    CkHttpResponse resp = http.GetHead("https://www.chilkatsoft.com/hamlet.xml");
    if (http.get_LastMethodSuccess() == false) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    // Examine the response header.
    Log.i(TAG, resp.header());

    // Here is a sample response header:

    // 	Content-Length: 279658
    // 	Content-Type: text/xml
    // 	Last-Modified: Thu, 12 May 2016 15:14:08 GMT
    // 	Accept-Ranges: bytes
    // 	ETag: "c1cd8bee60acd11:0"
    // 	Server: Microsoft-IIS/8.5
    // 	X-Powered-By: ASP.NET
    // 	X-Powered-By-Plesk: PleskWin
    // 	Date: Thu, 25 Jul 2019 16:40:54 GMT

    // Get the Last-Modified header.
    String lastModStr = resp.getHeaderField("Last-Modified");
    // If the header exists...
    if (resp.get_LastMethodSuccess() == true) {
        // Parse the RFC822 format date/time string
        CkDateTime ckdt = new CkDateTime();
        ckdt.SetFromRfc822(lastModStr);

        // If we want to access individual date/time parts (in the local timezone)
        CkDtObj dt = ckdt.GetDtObj(true);
        Log.i(TAG, "day/month/year = " + String.valueOf(dt.get_Day()) + "/" + String.valueOf(dt.get_Month()) + "/"
             + String.valueOf(dt.get_Year()));

        }


  }

  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."
  }
}