Android™

Download an IMAP Message Set

Demonstrates how to read a set of IMAP emails. 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;

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

    CkImap imap = new CkImap();

    //  Connect using TLS.
    imap.put_Ssl(true);
    imap.put_Port(993);
    success = imap.Connect("imap.example.com");
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    //  Authenticate
    success = imap.Login("email_account_login","email_account_password");
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    //  Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    //  Search for messages with the word "test" in the subject.
    boolean fetchUids = true;

    CkMessageSet messageSet = new CkMessageSet();
    success = imap.QueryMbx("Subject test",fetchUids,messageSet);
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    //  Download the messages in a single call to FetchMsgSet.
    //  
    //  This only makes sense if the number of emails to be downloaded is not too large.  
    //  For example, you wouldn't want to download 10000 emails in a single call to FetchMsgSet.
    //  Why? For two reasons:  (1) It could potentially cause an out-of-memory condition, and 
    //  (2) it would take an extremely large amount of time.  The longer the amount of time,
    //  the greater the likelihood of some kind of external networking or server problem occuring,
    //  and if it happens, then you would need to re-download everything from the beginning again.
    //  For large numbers of emails, it's better to loop over the emails in the message set
    //  and download/process one at a time as shown here: Download IMAP Messages One at a Time
    //  Downloading one message at a time makes it possible to resume the downloads rather than restart the entire operation all over again.

    //  If the message set is reasonable in size, you can download all at once using FetchMsgSet:

    Log.i(TAG, "Number of messages = " + String.valueOf(messageSet.get_Count()));

    CkEmailBundle bundle = new CkEmailBundle();
    boolean headersOnly = false;
    success = imap.FetchMsgSet(headersOnly,messageSet,bundle);
    if (success == false) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

    //  Display the Subject and From of each email.
    CkEmail email = new CkEmail();
    int i = 0;
    int numEmails = bundle.get_MessageCount();
    while (i < numEmails) {
        bundle.EmailAt(i,email);

        Log.i(TAG, email.getHeaderField("Date"));
        Log.i(TAG, email.subject());
        Log.i(TAG, email.ck_from());
        Log.i(TAG, "--");
        i = i + 1;
        }


  }

  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."
  }
}