Android™

Add a Related String Resource to an Email

Demonstrates the Chilkat Email.AddRelatedString method, which adds a text-based related MIME resource, such as a style sheet, from an in-memory string and returns the generated Content-ID. The first argument is the MIME resource name, the second is the text content, and the third is the charset used to encode it. Because the Content-ID is generated by the call, this example adds the style sheet first, then builds an HTML body in a StringBuilder that references the style sheet by that cid:, and passes the result to SetHtmlBody.

Background: Related items are not always images loaded from disk — sometimes the resource is text you already have in memory, like a generated CSS style sheet or an SVG. AddRelatedString lets you embed such content directly without writing a temporary file first. As with other related items, it lives in the multipart/related enclosure and is referenced from the HTML by the Content-ID the method returns.

Chilkat Android™ Downloads

Download Chilkat for Android™

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);

    //  Demonstrates the AddRelatedString method, which adds a text-based related MIME resource
    //  (such as a style sheet) from an in-memory string and returns the generated Content-ID.
    //  The first argument is the resource name, the second is the text content, the third is the charset.

    CkEmail email = new CkEmail();
    email.put_Subject("Email with a related style sheet");

    //  Add the text-based related resource first; capture the generated Content-ID.
    String cid = email.addRelatedString("styles.css","body { color: navy; }","utf-8");
    if (email.get_LastMethodSuccess() == false) {
        Log.i(TAG, email.lastErrorText());
        return true;
        }

    //  Build the HTML body, referencing the related style sheet by its Content-ID.  A
    //  placeholder is used and then replaced with the actual Content-ID.
    CkStringBuilder sbHtml = new CkStringBuilder();
    sbHtml.Append("<html><head><link rel=\"stylesheet\" href=\"cid:PLACEHOLDER_CID\"/></head><body>Styled content.</body></html>");
    int numReplaced = sbHtml.Replace("PLACEHOLDER_CID",cid);
    email.SetHtmlBody(sbHtml.getAsString());

    Log.i(TAG, "Related Content-ID = " + cid);
    Log.i(TAG, "NumRelatedItems = " + String.valueOf(email.get_NumRelatedItems()));

  }

  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."
  }
}