(Chilkat for Android™ API) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

Download: Chilkat for Android™ Java 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 {
  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView tv = new TextView(this);
    String outStr = "";

    CkImap imap = new CkImap();

    boolean success;

    //  Anything unlocks the component and begins a fully-functional 30-day trial.
    success = imap.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        outStr += imap.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Connect to an IMAP server.
    success = imap.Connect("mail.chilkatsoft.com");
    if (success != true) {
        outStr += imap.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Login
    success = imap.Login("****","****");
    if (success != true) {
        outStr += imap.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        outStr += imap.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    CkMessageSet messageSet;
    //  We can choose to fetch UIDs or sequence numbers.
    boolean fetchUids;
    fetchUids = true;
    //  Get the message IDs of all the emails in the mailbox
    messageSet = imap.Search("ALL",fetchUids);
    if (messageSet == null ) {
        outStr += imap.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  When downloading headers, each email object contains
    //  (obviously) the headers, but the body will be missing.
    //  Also, attachments will not be included.  However, it is
    //  possible to get information about the attachments
    //  as well as the complete size of the email.
    CkEmailBundle bundle;
    bundle = imap.FetchHeaders(messageSet);
    if (bundle == null ) {

        outStr += imap.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  Loop over the email objects and display information
    //  about each:
    int i;
    for (i = 0; i <= bundle.get_MessageCount() - 1; i++) {
        CkEmail email;
        email = bundle.GetEmail(i);

        //  Display the From and Subject
        outStr += email.ck_from() + "\n";
        outStr += email.subject() + "\n";

        //  Display the recipients:
        int j;
        String name;
        String addr;
        for (j = 0; j <= email.get_NumTo() - 1; j++) {
            name = email.getToName(j);
            addr = email.getToAddr(j);
            outStr += name + ", " + addr + "\n";
        }

        for (j = 0; j <= email.get_NumCC() - 1; j++) {
            name = email.getCcName(j);
            addr = email.getCcAddr(j);
            outStr += name + ", " + addr + "\n";
        }

        //  Show the total size of the email, including body and attachments:
        outStr += email.get_Size() + "\n";

        //  When a full email is downloaded, we would use the
        //  email.NumAttachments property in conjunction with the
        //  email.GetMailAttach* methods.
        //  However, when an email object contains only the header,
        //  we need to access the attachment info differently:
        int numAttach;
        numAttach = imap.GetMailNumAttach(email);
        for (j = 0; j <= numAttach - 1; j++) {
            outStr += imap.getMailAttachFilename(email,j) + "\n";
            int attachSize;
            attachSize = imap.GetMailAttachSize(email,j);
            outStr += "    size = " + attachSize
                 + " bytes" + "\n";
        }

        outStr += "--" + "\n";

    }

    //  Disconnect from the IMAP server.
    imap.Disconnect();


    tv.setText(outStr);
    setContentView(tv);
  }

  static {
      // Important: Make sure the name passed to loadLibrary matches the shared library
      // found in your project's libs/armeabi directory.
      //  for "libchilkat.so", pass "chilkat" to loadLibrary
      //  for "libchilkatemail.so", pass "chilkatemail" to loadLibrary
      //  etc.
      // 
      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."
  }
}