在Android应用程序中加载现有电子邮件并修改其内容

Posted 2021-02-23

This technical tip shows how to load any existing email message and modify its contents before saving it back to disk using Aspose.Email for android API. To do this successfully, specify the MessageFormat when loading the email message from disk. In addition, it is important to specify the correct MailMessageSaveType when saving the message back to disk.

To update and save an email, the following steps can be used:
1. Create an instance of the MailMessage class.
2. Load an existing message using the MailMessage class' load() method and specifying the MessageFormat of the existing message.
3. Get the subject using getSubject().
4. After modifying the subject, set it again using the setSubject() method.
5. Get the body using gethtmlBody().
6. AFter modifying the body, set it using the setHtmlBody() method .
7. Create an instance of the MailAddressCollection class.
8. Get the recipients from the TO field into a MailAddressCollection object using the getTo() method exposed by the MailMessage class.
9. Add or remove recipients using the add() and remove() methods exposed by the MailAddressCollection class.
10. Get the recipients from the CC field into a MailAddressCollection object using the getCC() method exposed by MailMessage class.
11. Add or remove recipients using the add() and remove() methods exposed by the MailAddressCollection class.
12. Call the save() method exposed by the MailMessage class, specifying the correct MailMessageSaveType to save the message file to the disk in MSG format.

public static void UpdateAndSaveEmail()
{
    // Base folder for reading and writing files
String  strBaseFolder  = Environment.getExternalStorageDirectory().getPath();
strBaseFolder = strBaseFolder + "/";
 
    //Initialize and load an existing MSG file by specifying the MessageFormat
MailMessage email = MailMessage.load(strBaseFolder + "anEmail.msg", MessageFormat.getMsg());
 
    //Initialize a String variable to get the Email Subject
    String subject = email.getSubject();
    //Append some more information to Subject
subject = subject + " This text is added to the existing subject";
    //Set the Email Subject
email.setSubject(subject);
 
    //Initialize a String variable to get the Email's HTML Body
    String body = email.getHtmlBody();
    //Apppend some more information to the Body variable
body = body + "<br> This text is added to the existing body";
    //Set the Email Body
email.setHtmlBody(body);
 
    //Initialize MailAddressCollection object
MailAddressCollection contacts = new MailAddressCollection();
 
    //Retrieve Email's TO list
contacts = email.getTo();
    //Check if TO list has some values
if (contacts.size() > 0)
    {
        //Remove the first email address
contacts.remove(0);
        //Add another email address to collection
contacts.add("[email protected]");
    }
    //Set the collection as Email's TO list
email.setTo(contacts);
 
    //Initialize MailAddressCollection
contacts = new MailAddressCollection();
 
    //Retrieve Email's CC list
contacts = email.getCC();
    //Add another email address to collection
contacts.add("[email protected]");
    //Set the collection as Email's CC list
email.setCC(contacts);
 
    //Save the Email message to disk by specifying the MessageFormat
email.save(strBaseFolder + "message.msg", MailMessageSaveType.getOutlookMessageFormat());