【异常】Could not find class 'javax.activation.DataHandler'

Android中使用java mail 1.4.1的lib发邮件时出现该问题，

Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeMessage.getDataHandler
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeMessage.setContent
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeMessage.setContent
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeMessage.updateHeaders
Could not find class 'javax.mail.MultipartDataSource', referenced from method javax.mail.internet.MimeMultipart.<init>
Could not find class 'javax.activation.FileDataSource', referenced from method javax.mail.internet.MimeBodyPart.attachFile
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeBodyPart.getDataHandler
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeBodyPart.setContent
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeBodyPart.setContent
Could not find class 'javax.activation.DataHandler', referenced from method javax.mail.internet.MimeBodyPart.updateHeaders

解决方法：

在android工程lib目录下放入additionnal.jar ， activation.jar ，mail.jar

下载地址：https://code.google.com/p/javamail-android/downloads/list

下载不下来的到这里下载：http://download.csdn.net/detail/weizi4332/7054871