Android™

Extract Linked Domains from an HTML Email

Demonstrates the Chilkat Email.LinkedDomains method, which extracts the domain names from the hyperlinks in an HTML email. Lowercase domains are appended to a StringTable without creating duplicates. This example sets an HTML body with several links and lists the distinct domains.

Background: The set of domains a message links to is a strong signal for spam and phishing analysis — legitimate mail usually points at a few expected domains, while abusive mail often hides links to many unrelated or look-alike hosts. LinkedDomains gives you that de-duplicated list directly. Note it only parses the links; it does not fetch them, so no network request is made.

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// 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 LinkedDomains method, which extracts the domain names from the
    //  hyperlinks in an HTML email.  Lowercase domains are appended to a StringTable without
    //  creating duplicates.

    CkEmail email = new CkEmail();
    email.put_Subject("LinkedDomains example");

    //  An HTML body containing several hyperlinks.
    email.SetHtmlBody("<html><body>Visit <a href=\"https://www.example.com/page\">Example</a>, <a href=\"http://sales.contoso.com\">Contoso</a>, and <a href=\"https://www.example.com/other\">Example again</a>.</body></html>");

    //  Extract the linked domains into a StringTable.
    CkStringTable domains = new CkStringTable();

    success = email.LinkedDomains(domains);
    if (success == false) {
        Log.i(TAG, email.lastErrorText());
        return true;
        }

    int n = domains.get_Count();
    int i;
    for (i = 0; i <= n - 1; i++) {
        Log.i(TAG, domains.stringAt(i));
        }


  }

  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."
  }
}