JavaMailAPI在模拟器上无法工作，仅适用于真机。

要在Android模拟器上使用Java Mail API，您需要在模拟器上安装SMTP服务器。这需要进行一些复杂的设置，因此更好的解决方案是在实际设备上测试您的应用程序。以下是一些示例代码，用于在Android应用程序中使用Java Mail API发送电子邮件：

1. 导入必要的包

import javax.activation.DataHandler; import javax.activation.DataSource; import javax.activation.FileDataSource; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.AddressException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeBodyPart; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMultipart;

2. 创建Session对象

Properties props = new Properties(); props.put("mail.smtp.host", "smtp.gmail.com"); props.put("mail.smtp.socketFactory.port", "465"); props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory"); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.port", "465");

Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication("example@gmail.com","PASSWORD"); } });

3. 创建MimeMessage对象

try { Message message = new MimeMessage(session);

message.setFrom(new InternetAddress("example@gmail.com"));
message.setRecipients(Message.RecipientType.TO,InternetAddress.parse("recipient@example.com"));
message.setSubject("Testing Subject");

String msg = "This is my test email using JavaMail API.";

MimeBodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setContent(msg, "text/html");

Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);

messageBodyPart = new MimeBodyPart();
String filename = Environment.getExternalStorageDirectory().getPath()+"/test.jpg";
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart