(Android™) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

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 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);
    boolean success = imap.Connect("imap.example.com");
    if (success != true) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

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

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

    // Search for messages and return a set of matching messages.
    // (This example will simply search for ALL messages.)
    boolean fetchUids = true;
    CkMessageSet messageSet = imap.Search("ALL",fetchUids);
    if (imap.get_LastMethodSuccess() != true) {
        Log.i(TAG, imap.lastErrorText());
        return;
        }

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

    int i = 0;
    while (i < messageSet.get_Count()) {
        CkEmail email = imap.FetchSingle(messageSet.GetId(i),fetchUids);
        if (imap.get_LastMethodSuccess() != true) {
            Log.i(TAG, imap.lastErrorText());

            return;
            }

        Log.i(TAG, email.ck_from() + "; " + email.subject());

        i = i + 1;
        }

    Log.i(TAG, "OK");

  }

  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."
  }
}