In the following task, an exception may be thrown when you invoke the Transport.more() method.

1. Import the required classes and interfaces.

   import net.rim.blackberry.api.mail.BodyPart;
   import net.rim.blackberry.api.mail.MimeBodyPart;
   import net.rim.blackberry.api.mail.Transport;
   import net.rim.device.api.ui.component.Dialog;
   

2. Create a method that takes a MimeBodyPart object as a parameter.

   void readEmailBody(MimeBodyPart mbp)
   {

3. Invoke MimeBodyPart.getContent() and MimeBodyPart.getContentType() to retrieve the content of the MimeBodyPart object.

   Object obj = mbp.getContent();
   String mimeType = mbp.getContentType();

4. Create a String variable to hold the String representation of the MimeBodyPart object.

   String body = null;

5. If the BlackBerry® device can convert the HTML body of a message to a String, the MimeBodyPart object will be a String. Cast the MimeBodyPart object as a String and assign it to the String representation of the body part of the message.

   if (obj instanceof String)
   {
      body = (String)obj;
   }

6. If the BlackBerry device cannot convert the HTML body of a message to a String, the MimeBodyPart object will be a byte array. Create a new instance of String using as a parameter the MimeBodyPart object cast as a byte array. Assign the String to the String representation of the body part of the message.

   else if (obj instanceof byte[])
   {
      body = new String((byte[])obj);
   }

7. Check to see if the String representation of the content of the MimeBodyPart object contains ContentType.TYPE_TEXT_PLAIN_STRING to determine if the MimeBodyPart object is the plain text body part of the message.

   if (mimeType.indexOf(ContentType.TYPE_TEXT_PLAIN_STRING) != -1)
   {

8. Invoke MimeBodyPart.hasMore() and MimeBodyPart.moreRequestSent() to determine if all of the text body part is present in the MimeBodyPart object.

   if (mbp.hasMore() && !mbp.moreRequestSent())
   {
    

9. If more data is available for the MimeBodyPart object, invoke Transport.more() to retrieve the rest of the data for the MimeBodyPart object.

   Transport.more((BodyPart)mbp, true);
   

10. Check to see if the String representation of the content of the MimeBodyPart object contains ContentType.TYPE_TEXT_HTML_STRING to detemine if the MimeBodyPart object is the HTML body part of the message.

    else if (mimeType.indexOf(ContentType.TYPE_TEXT_HTML_STRING) != -1)
    {

11. Invoke MimeBodyPart.hasMore() and MimeBodyPart.moreRequestSent() to determine if all of the HTML body part is present in the MimeBodyPart object.

    if (mbp.hasMore() && !mbp.moreRequestSent())
    {

12. If more data is available for the MimeBodyPart object, invoke Transport.more() to retrieve the rest of the MimeBodyPart object.

    Transport.more((BodyPart)mbp, true);
    

private void readEmailBody(MimeBodyPart mbp)
{
   //Extract the content of the message.
   Object obj = mbp.getContent();
   String mimeType = mbp.getContentType();
   String body = null;

   if (obj instanceof String)
   {
      body = (String)body;
   }
   else if (obj instanceof byte[])
   {
      body = new String((byte[])obj);
   }

   if (mimeType.indexOf(ContentType.TYPE_TEXT_PLAIN_STRING) != -1)
   {
      _plainTextMessage = body;

      //Determine if all of the text body part is present.
      if (mbp.hasMore() && !mbp.moreRequestSent())
      {
         try
         {
            Transport.more((BodyPart)mbp, true);
         }
         catch (Exception ex)
         {
            Dialog.alert("Exception: " + ex.toString());
         }
      }
   }
  
   else if (mimeType.indexOf(ContentType.TYPE_TEXT_HTML_STRING) != -1)
   {
      _htmlMessage = body;

      //Determine if all of the HTML body part is present.
      if (mbp.hasMore() && !mbp.moreRequestSent())
      {
         try
         {
            Transport.more((BodyPart)mbp, true);
         }
         catch (Exception ex)
         { 
            Dialog.alert("Exception: " + ex.toString());
         }
      }
   }
}