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" );


2.必须使用外部java mail library 以及写一个 类似下面的helper class

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"); 
  } 
 } 
} Sending the email is t