使用Gmail身份验证使用JavaMail API在Android中发送电子邮件。

创建示例项目的步骤：

MailSenderActivity.java：

public class MailSenderActivity extends Activity {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

final Button send = (Button) this.findViewById(R.id.send);

send.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

try {

GMailSender sender = new GMailSender("username@gmail.com", "password");

sender.sendMail("This is Subject",

"This is Body",

"user@gmail.com",

"user@yahoo.com");

} catch (Exception e) {

Log.e("SendMail", e.getMessage(), e);

}

}

});

}

}

GMailSender.java：

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 com.provider.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 {

try{

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);

}catch(Exception e){

}

}

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.java：

/*

*  Licensed to the Apache Software Foundation (ASF) under one or more

*  contributor license agreements.  See the NOTICE file distributed with

*  this work for additional information regarding copyright ownership.

*  The ASF licenses this file to You under the Apache License, Version 2.0

*  (the "License"); you may not use this file except in compliance with

*  the License.  You may obtain a copy of the License at

*

*     http://www.apache.org/licenses/LICENSE-2.0

*

*  Unless required by applicable law or agreed to in writing, software

*  distributed under the License is distributed on an "AS IS" BASIS,

*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

*  See the License for the specific language governing permissions and

*  limitations under the License.

*/

/**

* @author Alexander Y. Kleymenov

* @version $Revision$

*/

import java.security.AccessController;

import java.security.Provider;

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;

}

});

}

}

在您的Android项目的以下链接中添加3个罐子

并且不要忘记在清单中添加此行：

运行该项目并检查收件人邮件帐户中的邮件。干杯!

PS并且不要忘记你不能从android中的任何Activity做网络操作。因此，建议在主线程异常时使用AsyncTask或IntentService避免网络。