我在 Android 中使用以下代码发送邮件:

 Intent emailIntent = new Intent(Intent.ACTION_SEND);
 emailIntent.setType("text/html");
 emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,sendTo );

 emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "test" );
 emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, "msg" );

编译和运行代码时，它会询问我选择“GMail”、“BlueTooth”等应用程序的选项。但我希望在没有用户干预的情况下发送邮件。即使通过彩信发送对我来说也会好得多。有人可以建议我怎么做吗？

最佳答案

您需要在项目中包含 java 邮件库和依赖项，然后编写如下所示的帮助类。

public class GMailSender extends javax.mail.Authenticator {
 private String mailhost = "smtp.gmail.com";
 private String user;
 private String password;
 private Session session;

 static {
  Security.addProvider(new JSSEProvider());
 }

 public GMailSender(String user, String password) {
  this.user = user;
  this.password = password;

  Properties props = new Properties();
  props.setProperty("mail.transport.protocol", "smtp");
  props.setProperty("mail.host", mailhost);
  props.put("mail.smtp.auth", "true");
  props.put("mail.smtp.port", "465");
  props.put("mail.smtp.socketFactory.port", "465");
  props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
  props.put("mail.smtp.socketFactory.fallback", "false");
  props.setProperty("mail.smtp.quitwait", "false");

  session = Session.getDefaultInstance(props, this);
 }

 protected PasswordAuthentication getPasswordAuthentication() {
  return new PasswordAuthentication(user, password);
 }

 public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {
  MimeMessage message = new MimeMessage(session);
  DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
  message.setSender(new InternetAddress(sender));
  message.setSubject(subject);
  message.setDataHandler(handler);
  if (recipients.indexOf(',') > 0)
   message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
  else
   message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
  Transport.send(message);
 }

 public class ByteArrayDataSource implements DataSource {
  private byte[] data;
  private String type;

  public ByteArrayDataSource(byte[] data, String type) {
   super();
   this.data = data;
   this.type = type;
  }

  public ByteArrayDataSource(byte[] data) {
   super();
   this.data = data;
  }

  public void setType(String type) {
   this.type = type;
  }

  public String getContentType() {
   if (type == null)
    return "application/octet-stream";
   else
    return type;
  }

  public InputStream getInputStream() throws IOException {
   return new ByteArrayInputStream(data);
  }

  public String getName() {
   return "ByteArrayDataSource";
  }

  public OutputStream getOutputStream() throws IOException {
   throw new IOException("Not Supported");
  }
 }
}

JSSEProvider 类

@SuppressWarnings("serial")
public final class JSSEProvider extends Provider {
 public JSSEProvider() {
  super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
  AccessController.doPrivileged(new java.security.PrivilegedAction() {
   public Void run() {
    put("SSLContext.TLS", "org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
    put("Alg.Alias.SSLContext.TLSv1", "TLS");
    put("KeyManagerFactory.X509", "org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
    put("TrustManagerFactory.X509", "org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
    return null;
   }
  });
 }
}

发送邮件就这么简单

GMailSender sender = new GMailSender("username", "password");
sender.sendMail("subject", body, "sender", recipients);

关于Android编程-发送邮件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2713905/