blocks|key|2538868|text|您可以使用JavaMail接口处理您的电子邮件任务。JavaEE包中提供了JavaMail接口，其jar可供下载。遗憾的是，它不能直接在Android应用程序中使用，因为它使用的AWT组件在Android中完全不兼容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2538869|您可以在以下位置找到用于JavaMail的安卓端口：http://code.google.com/p/javamail-android/|offset|length|2538870|将jars添加到您的应用程序中并使用SMTP方法|2538871|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/javamail-android/^0|0|Q|16|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

You can use JavaMail API to handle your email tasks. JavaMail API is available in JavaEE package and its jar is available for download. Sadly it cannot be used directly in an Android application since it uses AWT components which are completely incompatible in Android.

You can find the Android port for JavaMail at the following location:
<a href="http://code.google.com/p/javamail-android/" rel="noreferrer">http://code.google.com/p/javamail-android/</a>

Add the jars to your application and use the SMTP method

blocks|key|54682|text|SMTP|type|unstyled|depth|inlineStyleRanges|entityRanges|data|54683|使用SMTP是一种方法，其他人已经指出了如何做到这一点。只需注意，在执行此操作时，您将完全绕过内置的邮件应用程序，并且您必须在代码中静态地提供SMTP服务器的地址、用户名和密码，或者从用户处查询它。|54684|HTTP|54685|另一种方式是使用一个简单的服务器端脚本，比如php，它接受一些URL参数并使用它们发送邮件。这样，您只需要从设备发出HTTP请求(通过内置的库很容易实现)，而不需要在设备上存储SMTP登录数据。与直接使用SMTP相比，这是一种更间接的方式，但因为从PHP发出HTTP请求和发送邮件非常容易，所以它甚至可能比直接方式更简单。|54686|邮件应用程序|54687|如果邮件是从用户已经在手机上注册的默认邮件帐户发送的，你必须采取一些其他的方法。如果你有足够的时间和经验，你可能想要检查Android电子邮件应用程序的源代码，看看它是否提供了在没有用户交互的情况下发送邮件的入口点(我不知道，但也许有一个)。|54688|也许你甚至会找到一种方法来查询用户的帐户详细信息(这样你就可以使用它们来进行SMTP了)，尽管我非常怀疑这是不可能的，因为这将是一个巨大的安全风险，而且Android的构建相当安全。|54689|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

<h2>SMTP</h2>

Using SMTP is one way to go, and the others have already pointed out ways how to do it. Just note that while doing this, you completely circumvent the built in mail app, and you will have to provide the address of the SMTP server, the user name and password for that server, either statically in your code, or query it from the user.

<h2>HTTP</h2>

Another way would involve a simple server side script, like php, that takes some URL parameters and uses them to send a mail. This way, you only need to make an HTTP request from the device (easily possible with the built in libraries) and don't need to store the SMTP login data on the device. This is one more indirection compared to direct SMTP usage, but because it's so very easy to make HTTP request and send mails from PHP, it might even be simpler than the direct way.

<h2>Mail Application</h2>

If the mail shall be send from the users default mail account that he already registered with the phone, you'd have to take some other approach. If you have enough time and experience, you might want to check the source code of the Android Email application to see if it offers some entry point to send a mail without user interaction (I don't know, but maybe there is one).

Maybe you even find a way to query the users account details (so you can use them for SMTP), though I highly doubt that this is possible, because it would be a huge security risk and Android is built rather securely.

blocks|key|53171|text|在Android中使用Gmail身份验证的JavaMail+API发送电子邮件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53172|创建示例项目的步骤：|53173|MailSenderActivity.java:|offset|length|style|BOLD|53174|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);+++
++++++++++++++++}+
++++++++++++++++
++++++++++++}
++++++++});
++++++++
++++}
}|code-block|syntax|javascript|53175|GMailSender.java:|53176|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");+++
++++++++}+++
++++}+++
}++|53177|JSSEProvider.java:|53178|/*
+*++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<Void>()+{
++++++++++++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;
++++++++++++}
++++++++});
++++}
}|53179|将以下链接中的3个jars添加到您的Android项目中|53180|53181|mail.jar|unordered-list-item|53182|activation.jar|53183|additional.jar|53184|53185|Click+here+-+How+to+add+External+Jars|53186|别忘了在你的清单中添加这一行：|53187|<uses-permission+android:name="android.permission.INTERNET"+/>|53188|只需单击以下链接即可更改安全性较低的应用程序的帐户访问权限+https://www.google.com/settings/security/lesssecureapps|53189|运行项目并检查邮件的收件人邮件帐户。干杯!|53190|另外，别忘了，你不能在android的任何活动中进行网络操作。因此，建议使用AsyncTask或IntentService，以避免主线程上的网络异常。|CODE|53191|Jar文件：https://code.google.com/archive/p/javamail-android/|53192|entityMap|0|LINK|mutability|MUTABLE|url|https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/javamail-android/mail.jar|1|https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/javamail-android/activation.jar|2|https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/javamail-android/additionnal.jar|3|https://stackoverflow.com/a/6859020/28557|4|https://www.google.com/settings/security/lesssecureapps|5|https://code.google.com/archive/p/javamail-android/^0|0|0|0|O|0|0|0|H|0|0|0|I|0|0|0|0|0|8|0|0|0|E|1|0|0|E|2|0|0|0|11|3|0|0|0|0|T|U|1J|4|0|0|12|9|1C|D|0|6|1F|5|0^^$0|@$1|2|3|4|5|6|7|24|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|25|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|26|8|@$F|27|G|28|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|29|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|2A|8|@$F|2B|G|2C|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|2D|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|2E|8|@$F|2F|G|2G|H|I]]|9|@]|A|$]]|$1|U|3|V|5|L|7|2H|8|@]|9|@]|A|$M|N]]|$1|W|3|X|5|6|7|2I|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|2J|8|@]|9|@]|A|$]]|$1|Z|3|10|5|11|7|2K|8|@]|9|@$F|2L|G|2M|1|2N]]|A|$]]|$1|12|3|13|5|11|7|2O|8|@]|9|@$F|2P|G|2Q|1|2R]]|A|$]]|$1|14|3|15|5|11|7|2S|8|@]|9|@$F|2T|G|2U|1|2V]]|A|$]]|$1|16|3|-4|5|6|7|2W|8|@]|9|@]|A|$]]|$1|17|3|18|5|6|7|2X|8|@]|9|@$F|2Y|G|2Z|1|30]]|A|$]]|$1|19|3|1A|5|6|7|31|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|L|7|32|8|@]|9|@]|A|$M|N]]|$1|1D|3|1E|5|6|7|33|8|@$F|34|G|35|H|I]]|9|@$F|36|G|37|1|38]]|A|$]]|$1|1F|3|1G|5|6|7|39|8|@]|9|@]|A|$]]|$1|1H|3|1I|5|6|7|3A|8|@$F|3B|G|3C|H|1J]|$F|3D|G|3E|H|1J]]|9|@]|A|$]]|$1|1K|3|1L|5|6|7|3F|8|@]|9|@$F|3G|G|3H|1|3I]]|A|$]]|$1|1M|3|-4|5|6|7|3J|8|@]|9|@]|A|$]]]|1N|$1O|$5|1P|1Q|1R|A|$1S|1T]]|1U|$5|1P|1Q|1R|A|$1S|1V]]|1W|$5|1P|1Q|1R|A|$1S|1X]]|1Y|$5|1P|1Q|1R|A|$1S|1Z]]|20|$5|1P|1Q|1R|A|$1S|21]]|22|$5|1P|1Q|1R|A|$1S|23]]]]

Send e-mail in Android using the JavaMail API using Gmail authentication.
<h3>Steps to create a sample Project:</h3>
MailSenderActivity.java:
<pre><code>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(&quot;username@gmail.com&quot;, &quot;password&quot;);
 sender.sendMail(&quot;This is Subject&quot;, 
 &quot;This is Body&quot;, 
 &quot;user@gmail.com&quot;, 
 &quot;user@yahoo.com&quot;); 
 } catch (Exception e) { 
 Log.e(&quot;SendMail&quot;, e.getMessage(), e); 
 } 
 
 }
 });
 
 }
}
</code></pre>
GMailSender.java:
<pre><code>public class GMailSender extends javax.mail.Authenticator { 
 private String mailhost = &quot;smtp.gmail.com&quot;; 
 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(&quot;mail.transport.protocol&quot;, &quot;smtp&quot;); 
 props.setProperty(&quot;mail.host&quot;, mailhost); 
 props.put(&quot;mail.smtp.auth&quot;, &quot;true&quot;); 
 props.put(&quot;mail.smtp.port&quot;, &quot;465&quot;); 
 props.put(&quot;mail.smtp.socketFactory.port&quot;, &quot;465&quot;); 
 props.put(&quot;mail.smtp.socketFactory.class&quot;, 
 &quot;javax.net.ssl.SSLSocketFactory&quot;); 
 props.put(&quot;mail.smtp.socketFactory.fallback&quot;, &quot;false&quot;); 
 props.setProperty(&quot;mail.smtp.quitwait&quot;, &quot;false&quot;); 
 
 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(), &quot;text/plain&quot;)); 
 message.setSender(new InternetAddress(sender)); 
 message.setSubject(subject); 
 message.setDataHandler(handler); 
 if (recipients.indexOf(',') &gt; 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 &quot;application/octet-stream&quot;; 
 else 
 return type; 
 } 
 
 public InputStream getInputStream() throws IOException { 
 return new ByteArrayInputStream(data); 
 } 
 
 public String getName() { 
 return &quot;ByteArrayDataSource&quot;; 
 } 
 
 public OutputStream getOutputStream() throws IOException { 
 throw new IOException(&quot;Not Supported&quot;); 
 } 
 } 
} 
</code></pre>
JSSEProvider.java:
<pre><code>/*
 * 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 &quot;License&quot;); 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 &quot;AS IS&quot; 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(&quot;HarmonyJSSE&quot;, 1.0, &quot;Harmony JSSE Provider&quot;);
 AccessController.doPrivileged(new java.security.PrivilegedAction&lt;Void&gt;() {
 public Void run() {
 put(&quot;SSLContext.TLS&quot;,
 &quot;org.apache.harmony.xnet.provider.jsse.SSLContextImpl&quot;);
 put(&quot;Alg.Alias.SSLContext.TLSv1&quot;, &quot;TLS&quot;);
 put(&quot;KeyManagerFactory.X509&quot;,
 &quot;org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl&quot;);
 put(&quot;TrustManagerFactory.X509&quot;,
 &quot;org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl&quot;);
 return null;
 }
 });
 }
}
</code></pre>
ADD 3 jars found in the following link to your Android Project
<ul>
<li><a href="https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/javamail-android/mail.jar" rel="noreferrer">mail.jar</a></li>
<li><a href="https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/javamail-android/activation.jar" rel="noreferrer">activation.jar</a></li>
<li><a href="https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/javamail-android/additionnal.jar" rel="noreferrer">additional.jar</a></li>
</ul>
<a href="https://stackoverflow.com/a/6859020/28557">Click here - How to add External Jars</a>
And don't forget to add this line in your manifest:
<pre><code>&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;
</code></pre>
Just click below link to change account access for less secure apps
<a href="https://www.google.com/settings/security/lesssecureapps" rel="noreferrer">https://www.google.com/settings/security/lesssecureapps</a>
Run the project and check your recipient mail account for the mail.
Cheers!
P.S. And don't forget that you cannot do network operation from any Activity in android.
Hence it is recommended to use <code>AsyncTask</code> or <code>IntentService</code> to avoid network on main thread exception.
Jar files: <a href="https://code.google.com/archive/p/javamail-android/" rel="noreferrer">https://code.google.com/archive/p/javamail-android/</a>

blocks|key|53211|text|感谢您提供的宝贵信息。代码运行正常。我能够添加附件也通过添加以下代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53212|private+Multipart+_multipart;+
_multipart+=+new+MimeMultipart();+

public+void+addAttachment(String+filename,String+subject)+throws+Exception+{+
++++BodyPart+messageBodyPart+=+new+MimeBodyPart();+
++++DataSource+source+=+new+FileDataSource(filename);+
++++messageBodyPart.setDataHandler(new+DataHandler(source));+
++++messageBodyPart.setFileName(filename);+
++++_multipart.addBodyPart(messageBodyPart);

++++BodyPart+messageBodyPart2+=+new+MimeBodyPart();+
++++messageBodyPart2.setText(subject);+

++++_multipart.addBodyPart(messageBodyPart2);+
}+



message.setContent(_multipart);|code-block|syntax|javascript|53213|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Thank you for your valuable information. Code is working fine. I am able to add attachment also by adding following code.

<pre><code>private Multipart _multipart; 
_multipart = new MimeMultipart(); 

public void addAttachment(String filename,String subject) throws Exception { 
 BodyPart messageBodyPart = new MimeBodyPart(); 
 DataSource source = new FileDataSource(filename); 
 messageBodyPart.setDataHandler(new DataHandler(source)); 
 messageBodyPart.setFileName(filename); 
 _multipart.addBodyPart(messageBodyPart);

 BodyPart messageBodyPart2 = new MimeBodyPart(); 
 messageBodyPart2.setText(subject); 

 _multipart.addBodyPart(messageBodyPart2); 
} 



message.setContent(_multipart);
</code></pre>

blocks|key|2749109|text|这是一个alt版本，也适用于我，并有附件(上面已经发布了，但与源链接不同的是完整版本，人们发布的链接由于缺少数据而无法正常工作)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749110|import+java.util.Date;+
import+java.util.Properties;+
import+javax.activation.CommandMap;+
import+javax.activation.DataHandler;+
import+javax.activation.DataSource;+
import+javax.activation.FileDataSource;+
import+javax.activation.MailcapCommandMap;+
import+javax.mail.BodyPart;+
import+javax.mail.Multipart;+
import+javax.mail.PasswordAuthentication;+
import+javax.mail.Session;+
import+javax.mail.Transport;+
import+javax.mail.internet.InternetAddress;+
import+javax.mail.internet.MimeBodyPart;+
import+javax.mail.internet.MimeMessage;+
import+javax.mail.internet.MimeMultipart;+


public+class+Mail+extends+javax.mail.Authenticator+{+
++private+String+_user;+
++private+String+_pass;+

++private+String[]+_to;+
++private+String+_from;+

++private+String+_port;+
++private+String+_sport;+

++private+String+_host;+

++private+String+_subject;+
++private+String+_body;+

++private+boolean+_auth;+

++private+boolean+_debuggable;+

++private+Multipart+_multipart;+


++public+Mail()+{+
++++_host+=+"smtp.gmail.com";+//+default+smtp+server+
++++_port+=+"465";+//+default+smtp+port+
++++_sport+=+"465";+//+default+socketfactory+port+

++++_user+=+"";+//+username+
++++_pass+=+"";+//+password+
++++_from+=+"";+//+email+sent+from+
++++_subject+=+"";+//+email+subject+
++++_body+=+"";+//+email+body+

++++_debuggable+=+false;+//+debug+mode+on+or+off+-+default+off+
++++_auth+=+true;+//+smtp+authentication+-+default+on+

++++_multipart+=+new+MimeMultipart();+

++++//+There+is+something+wrong+with+MailCap,+javamail+can+not+find+a+handler+for+the+multipart/mixed+part,+so+this+bit+needs+to+be+added.+
++++MailcapCommandMap+mc+=+(MailcapCommandMap)+CommandMap.getDefaultCommandMap();+
++++mc.addMailcap("text/html;;+x-java-content-handler=com.sun.mail.handlers.text_html");+
++++mc.addMailcap("text/xml;;+x-java-content-handler=com.sun.mail.handlers.text_xml");+
++++mc.addMailcap("text/plain;;+x-java-content-handler=com.sun.mail.handlers.text_plain");+
++++mc.addMailcap("multipart/*;;+x-java-content-handler=com.sun.mail.handlers.multipart_mixed");+
++++mc.addMailcap("message/rfc822;;+x-java-content-handler=com.sun.mail.handlers.message_rfc822");+
++++CommandMap.setDefaultCommandMap(mc);+
++}+

++public+Mail(String+user,+String+pass)+{+
++++this();+

++++_user+=+user;+
++++_pass+=+pass;+
++}+

++public+boolean+send()+throws+Exception+{+
++++Properties+props+=+_setProperties();+

++++if(!_user.equals("")+&&+!_pass.equals("")+&&+_to.length+>+0+&&+!_from.equals("")+&&+!_subject.equals("")+&&+!_body.equals(""))+{+
++++++Session+session+=+Session.getInstance(props,+this);+

++++++MimeMessage+msg+=+new+MimeMessage(session);+

++++++msg.setFrom(new+InternetAddress(_from));+

++++++InternetAddress[]+addressTo+=+new+InternetAddress[_to.length];+
++++++for+(int+i+=+0;+i+<+_to.length;+i%2B%2B)+{+
++++++++addressTo[i]+=+new+InternetAddress(_to[i]);+
++++++}+
++++++++msg.setRecipients(MimeMessage.RecipientType.TO,+addressTo);+

++++++msg.setSubject(_subject);+
++++++msg.setSentDate(new+Date());+

++++++//+setup+message+body+
++++++BodyPart+messageBodyPart+=+new+MimeBodyPart();+
++++++messageBodyPart.setText(_body);+
++++++_multipart.addBodyPart(messageBodyPart);+

++++++//+Put+parts+in+message+
++++++msg.setContent(_multipart);+

++++++//+send+email+
++++++Transport.send(msg);+

++++++return+true;+
++++}+else+{+
++++++return+false;+
++++}+
++}+

++public+void+addAttachment(String+filename)+throws+Exception+{+
++++BodyPart+messageBodyPart+=+new+MimeBodyPart();+
++++DataSource+source+=+new+FileDataSource(filename);+
++++messageBodyPart.setDataHandler(new+DataHandler(source));+
++++messageBodyPart.setFileName(filename);+

++++_multipart.addBodyPart(messageBodyPart);+
++}+

++@Override+
++public+PasswordAuthentication+getPasswordAuthentication()+{+
++++return+new+PasswordAuthentication(_user,+_pass);+
++}+

++private+Properties+_setProperties()+{+
++++Properties+props+=+new+Properties();+

++++props.put("mail.smtp.host",+_host);+

++++if(_debuggable)+{+
++++++props.put("mail.debug",+"true");+
++++}+

++++if(_auth)+{+
++++++props.put("mail.smtp.auth",+"true");+
++++}+

++++props.put("mail.smtp.port",+_port);+
++++props.put("mail.smtp.socketFactory.port",+_sport);+
++++props.put("mail.smtp.socketFactory.class",+"javax.net.ssl.SSLSocketFactory");+
++++props.put("mail.smtp.socketFactory.fallback",+"false");+

++++return+props;+
++}+

++//+the+getters+and+setters+
++public+String+getBody()+{+
++++return+_body;+
++}+

++public+void+setBody(String+_body)+{+
++++this._body+=+_body;+
++}

++public+void+setTo(String[]+toArr)+{
++++++//+TODO+Auto-generated+method+stub
++++++this._to=toArr;
++}

++public+void+setFrom(String+string)+{
++++++//+TODO+Auto-generated+method+stub
++++++this._from=string;
++}

++public+void+setSubject(String+string)+{
++++++//+TODO+Auto-generated+method+stub
++++++this._subject=string;
++}++

++//+more+of+the+getters+and+setters+…..+
}|code-block|syntax|javascript|2749111|要在活动中调用它。|2749112|@Override+
public+void+onCreate(Bundle+icicle)+{+
++super.onCreate(icicle);+
++setContentView(R.layout.main);+

++Button+addImage+=+(Button)+findViewById(R.id.send_email);+
++addImage.setOnClickListener(new+View.OnClickListener()+{+
++++public+void+onClick(View+view)+{+
++++++Mail+m+=+new+Mail("gmailusername@gmail.com",+"password");+

++++++String[]+toArr+=+{"bla@bla.com",+"lala@lala.com"};+
++++++m.setTo(toArr);+
++++++m.setFrom("wooo@wooo.com");+
++++++m.setSubject("This+is+an+email+sent+using+my+Mail+JavaMail+wrapper+from+an+Android+device.");+
++++++m.setBody("Email+body.");+

++++++try+{+
++++++++m.addAttachment("/sdcard/filelocation");+

++++++++if(m.send())+{+
++++++++++Toast.makeText(MailApp.this,+"Email+was+sent+successfully.",+Toast.LENGTH_LONG).show();+
++++++++}+else+{+
++++++++++Toast.makeText(MailApp.this,+"Email+was+not+sent.",+Toast.LENGTH_LONG).show();+
++++++++}+
++++++}+catch(Exception+e)+{+
++++++++//Toast.makeText(MailApp.this,+"There+was+a+problem+sending+the+email.",+Toast.LENGTH_LONG).show();+
++++++++Log.e("MailApp",+"Could+not+send+email",+e);+
++++++}+
++++}+
++});+
}+|2749113|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

here is an alt version that also works for me and has attachments (posted already above but complete version unlike the source link, which people posted they cant get it to work since its missing data)

<pre><code>import java.util.Date; 
import java.util.Properties; 
import javax.activation.CommandMap; 
import javax.activation.DataHandler; 
import javax.activation.DataSource; 
import javax.activation.FileDataSource; 
import javax.activation.MailcapCommandMap; 
import javax.mail.BodyPart; 
import javax.mail.Multipart; 
import javax.mail.PasswordAuthentication; 
import javax.mail.Session; 
import javax.mail.Transport; 
import javax.mail.internet.InternetAddress; 
import javax.mail.internet.MimeBodyPart; 
import javax.mail.internet.MimeMessage; 
import javax.mail.internet.MimeMultipart; 


public class Mail extends javax.mail.Authenticator { 
 private String _user; 
 private String _pass; 

 private String[] _to; 
 private String _from; 

 private String _port; 
 private String _sport; 

 private String _host; 

 private String _subject; 
 private String _body; 

 private boolean _auth; 

 private boolean _debuggable; 

 private Multipart _multipart; 


 public Mail() { 
 _host = "smtp.gmail.com"; // default smtp server 
 _port = "465"; // default smtp port 
 _sport = "465"; // default socketfactory port 

 _user = ""; // username 
 _pass = ""; // password 
 _from = ""; // email sent from 
 _subject = ""; // email subject 
 _body = ""; // email body 

 _debuggable = false; // debug mode on or off - default off 
 _auth = true; // smtp authentication - default on 

 _multipart = new MimeMultipart(); 

 // There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added. 
 MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap(); 
 mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html"); 
 mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml"); 
 mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain"); 
 mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
 mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822"); 
 CommandMap.setDefaultCommandMap(mc); 
 } 

 public Mail(String user, String pass) { 
 this(); 

 _user = user; 
 _pass = pass; 
 } 

 public boolean send() throws Exception { 
 Properties props = _setProperties(); 

 if(!_user.equals("") &amp;&amp; !_pass.equals("") &amp;&amp; _to.length &gt; 0 &amp;&amp; !_from.equals("") &amp;&amp; !_subject.equals("") &amp;&amp; !_body.equals("")) { 
 Session session = Session.getInstance(props, this); 

 MimeMessage msg = new MimeMessage(session); 

 msg.setFrom(new InternetAddress(_from)); 

 InternetAddress[] addressTo = new InternetAddress[_to.length]; 
 for (int i = 0; i &lt; _to.length; i++) { 
 addressTo[i] = new InternetAddress(_to[i]); 
 } 
 msg.setRecipients(MimeMessage.RecipientType.TO, addressTo); 

 msg.setSubject(_subject); 
 msg.setSentDate(new Date()); 

 // setup message body 
 BodyPart messageBodyPart = new MimeBodyPart(); 
 messageBodyPart.setText(_body); 
 _multipart.addBodyPart(messageBodyPart); 

 // Put parts in message 
 msg.setContent(_multipart); 

 // send email 
 Transport.send(msg); 

 return true; 
 } else { 
 return false; 
 } 
 } 

 public void addAttachment(String filename) throws Exception { 
 BodyPart messageBodyPart = new MimeBodyPart(); 
 DataSource source = new FileDataSource(filename); 
 messageBodyPart.setDataHandler(new DataHandler(source)); 
 messageBodyPart.setFileName(filename); 

 _multipart.addBodyPart(messageBodyPart); 
 } 

 @Override 
 public PasswordAuthentication getPasswordAuthentication() { 
 return new PasswordAuthentication(_user, _pass); 
 } 

 private Properties _setProperties() { 
 Properties props = new Properties(); 

 props.put("mail.smtp.host", _host); 

 if(_debuggable) { 
 props.put("mail.debug", "true"); 
 } 

 if(_auth) { 
 props.put("mail.smtp.auth", "true"); 
 } 

 props.put("mail.smtp.port", _port); 
 props.put("mail.smtp.socketFactory.port", _sport); 
 props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
 props.put("mail.smtp.socketFactory.fallback", "false"); 

 return props; 
 } 

 // the getters and setters 
 public String getBody() { 
 return _body; 
 } 

 public void setBody(String _body) { 
 this._body = _body; 
 }

 public void setTo(String[] toArr) {
 // TODO Auto-generated method stub
 this._to=toArr;
 }

 public void setFrom(String string) {
 // TODO Auto-generated method stub
 this._from=string;
 }

 public void setSubject(String string) {
 // TODO Auto-generated method stub
 this._subject=string;
 } 

 // more of the getters and setters ….. 
}
</code></pre>

and to call it in an activity...

<pre><code>@Override 
public void onCreate(Bundle icicle) { 
 super.onCreate(icicle); 
 setContentView(R.layout.main); 

 Button addImage = (Button) findViewById(R.id.send_email); 
 addImage.setOnClickListener(new View.OnClickListener() { 
 public void onClick(View view) { 
 Mail m = new Mail("gmailusername@gmail.com", "password"); 

 String[] toArr = {"bla@bla.com", "lala@lala.com"}; 
 m.setTo(toArr); 
 m.setFrom("wooo@wooo.com"); 
 m.setSubject("This is an email sent using my Mail JavaMail wrapper from an Android device."); 
 m.setBody("Email body."); 

 try { 
 m.addAttachment("/sdcard/filelocation"); 

 if(m.send()) { 
 Toast.makeText(MailApp.this, "Email was sent successfully.", Toast.LENGTH_LONG).show(); 
 } else { 
 Toast.makeText(MailApp.this, "Email was not sent.", Toast.LENGTH_LONG).show(); 
 } 
 } catch(Exception e) { 
 //Toast.makeText(MailApp.this, "There was a problem sending the email.", Toast.LENGTH_LONG).show(); 
 Log.e("MailApp", "Could not send email", e); 
 } 
 } 
 }); 
} 
</code></pre>

blocks|key|53253|text|为了帮助那些在SDK目标>9的情况下获得主线程上的网络异常。这是使用上面的droopie的代码，但对于任何代码都是类似的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53254|StrictMode.ThreadPolicy+policy+=+new+StrictMode.ThreadPolicy.Builder().permitAll().build();

StrictMode.setThreadPolicy(policy);+

android.os.NetworkOnMainThreadException|code-block|syntax|javascript|53255|您可以使用AsyncTask，如下所示|53256|public+void+onClickMail(View+view)+{
++++new+SendEmailAsyncTask().execute();
}

class+SendEmailAsyncTask+extends+AsyncTask+<Void,+Void,+Boolean>+{
++++Mail+m+=+new+Mail("from@gmail.com",+"my+password");

++++public+SendEmailAsyncTask()+{
++++++++if+(BuildConfig.DEBUG)+Log.v(SendEmailAsyncTask.class.getName(),+"SendEmailAsyncTask()");
++++++++String[]+toArr+=+{+"to+mail@gmail.com"};
++++++++m.setTo(toArr);
++++++++m.setFrom("from+mail@gmail.com");
++++++++m.setSubject("Email+from+Android");
++++++++m.setBody("body.");
++++}

++++@Override
++++protected+Boolean+doInBackground(Void...+params)+{
++++++++if+(BuildConfig.DEBUG)+Log.v(SendEmailAsyncTask.class.getName(),+"doInBackground()");
++++++++try+{
++++++++++++m.send();
++++++++++++return+true;
++++++++}+catch+(AuthenticationFailedException+e)+{
++++++++++++Log.e(SendEmailAsyncTask.class.getName(),+"Bad+account+details");
++++++++++++e.printStackTrace();
++++++++++++return+false;
++++++++}+catch+(MessagingException+e)+{
++++++++++++Log.e(SendEmailAsyncTask.class.getName(),+m.getTo(null)+%2B+"failed");
++++++++++++e.printStackTrace();
++++++++++++return+false;
++++++++}+catch+(Exception+e)+{
++++++++++++e.printStackTrace();
++++++++++++return+false;
++++++++}
++++}|53257|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In order to help those getting a Network On Main Thread Exception with an SDK Target >9. This is using droopie's code above but will work similarly for any.

<pre><code>StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

StrictMode.setThreadPolicy(policy); 

android.os.NetworkOnMainThreadException
</code></pre>

You can use AsyncTask as below

<pre><code>public void onClickMail(View view) {
 new SendEmailAsyncTask().execute();
}

class SendEmailAsyncTask extends AsyncTask &lt;Void, Void, Boolean&gt; {
 Mail m = new Mail("from@gmail.com", "my password");

 public SendEmailAsyncTask() {
 if (BuildConfig.DEBUG) Log.v(SendEmailAsyncTask.class.getName(), "SendEmailAsyncTask()");
 String[] toArr = { "to mail@gmail.com"};
 m.setTo(toArr);
 m.setFrom("from mail@gmail.com");
 m.setSubject("Email from Android");
 m.setBody("body.");
 }

 @Override
 protected Boolean doInBackground(Void... params) {
 if (BuildConfig.DEBUG) Log.v(SendEmailAsyncTask.class.getName(), "doInBackground()");
 try {
 m.send();
 return true;
 } catch (AuthenticationFailedException e) {
 Log.e(SendEmailAsyncTask.class.getName(), "Bad account details");
 e.printStackTrace();
 return false;
 } catch (MessagingException e) {
 Log.e(SendEmailAsyncTask.class.getName(), m.getTo(null) + "failed");
 e.printStackTrace();
 return false;
 } catch (Exception e) {
 e.printStackTrace();
 return false;
 }
 }
</code></pre>

blocks|key|53272|text|您是否考虑过使用Apache+Commons+Net？从3.3开始，只需一个jar+(您可以使用gradle或maven依赖它)，您就完成了：http://blog.dahanne.net/2013/06/17/sending-a-mail-in-java-and-android-with-apache-commons-net/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|53273|entityMap|0|LINK|mutability|MUTABLE|url|http://blog.dahanne.net/2013/06/17/sending-a-mail-in-java-and-android-with-apache-commons-net/^0|1Z|2M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Did you consider using Apache Commons Net ? Since 3.3, just one jar (and you can depend on it using gradle or maven) and you're done : <a href="http://blog.dahanne.net/2013/06/17/sending-a-mail-in-java-and-android-with-apache-commons-net/" rel="nofollow">http://blog.dahanne.net/2013/06/17/sending-a-mail-in-java-and-android-with-apache-commons-net/</a>

blocks|key|2749170|text|+Add+jar+files+mail.jar,activation.jar,additionnal.jar

+String+sub="Thank+you+for+your+online+registration"+;+
+Mail+m+=+new+Mail("emailid",+"password");+

+String[]+toArr+=+{"ekkatrainfo@gmail.com",sEmailId};
+m.setFrom("ekkatrainfo@gmail.com");+

+++++m.setTo(toArr);
+++++m.setSubject(sub);
++++m.setBody(msg);



+++++++++++++++++++++try{


++++++++++++++++++++++++++++if(m.send())+{+

++++++++++++++++++++++++++++}+else+{+

++++++++++++++++++++++++++++}+
++++++++++++++++++++++++++}+catch(Exception+e)+{+

++++++++++++++++++++++++++++Log.e("MailApp",+"Could+not+send+email",+e);+
++++++++++++++++++++++++++}+

++package+com.example.ekktra;

+++import+java.util.Date;
+++import+java.util.Properties;

+++import+javax.activation.CommandMap;
+++import+javax.activation.DataHandler;
+++import+javax.activation.DataSource;
+++import+javax.activation.FileDataSource;
+++import+javax.activation.MailcapCommandMap;
+++import+javax.mail.BodyPart;
+++import+javax.mail.Multipart;
+++import+javax.mail.PasswordAuthentication;
+++import+javax.mail.Session;
+++import+javax.mail.Transport;
+++import+javax.mail.internet.InternetAddress;
+++import+javax.mail.internet.MimeBodyPart;
+++import+javax.mail.internet.MimeMessage;
+++import+javax.mail.internet.MimeMultipart;

+++public+class+Mail+extends+javax.mail.Authenticator+{+
+++++private+String+_user;+
+++++private+String+_pass;+

+++++private+String[]+_to;+

+++++private+String+_from;+

+++++private+String+_port;+
+++++private+String+_sport;+

+++++private+String+_host;+

+++++private+String+_subject;+
+++++private+String+_body;+

+++++private+boolean+_auth;+

+++++private+boolean+_debuggable;+

+++++private+Multipart+_multipart;+


+++public+Mail()+{+
++++++_host+=+"smtp.gmail.com";+//+default+smtp+server+
++++++_port+=+"465";+//+default+smtp+port+
++++++_sport+=+"465";+//+default+socketfactory+port+

++++++_user+=+"";+//+username+
++++++_pass+=+"";+//+password+
++++++_from+=+"";+//+email+sent+from+
++++++_subject+=+"";+//+email+subject+
++++++_body+=+"";+//+email+body+

++++++_debuggable+=+false;+//+debug+mode+on+or+off+-+default+off+
++++++_auth+=+true;+//+smtp+authentication+-+default+on+

++++++_multipart+=+new+MimeMultipart();+

++++++//+There+is+something+wrong+with+MailCap,+javamail+can+not+find+a+handler+for+the++++++++multipart/mixed+part,+so+this+bit+needs+to+be+added.+
++++++MailcapCommandMap+mc+=+(MailcapCommandMap)+CommandMap.getDefaultCommandMap();+
+++mc.addMailcap("text/html;;+x-java-content-handler=com.sun.mail.handlers.text_html");+
+++mc.addMailcap("text/xml;;+x-java-content-handler=com.sun.mail.handlers.text_xml");+
+++mc.addMailcap("text/plain;;+x-java-content-++handler=com.sun.mail.handlers.text_plain");+
+++mc.addMailcap("multipart/*;;+x-java-content-handler=com.sun.mail.handlers.multipart_mixed");+
+++mc.addMailcap("message/rfc822;;+x-java-content-+handler=com.sun.mail.handlers.message_rfc822");+
++++CommandMap.setDefaultCommandMap(mc);+
+++}+

+public+Mail(String+user,+String+pass)+{+
++this();+

++_user+=+user;+
+++_pass+=+pass;+
+}+

public+boolean+send()+throws+Exception+{+
+++Properties+props+=+_setProperties();+

++if(!_user.equals("")+&&+!_pass.equals("")+&&+_to.length+>+0+&&+!_from.equals("")+&&+++!_subject.equals("")+/*&&+!_body.equals("")*/)+{+
++++Session+session+=+Session.getInstance(props,+this);+

++++MimeMessage+msg+=+new+MimeMessage(session);+

+++++msg.setFrom(new+InternetAddress(_from));+

++++InternetAddress[]+addressTo+=+new+InternetAddress[_to.length];+
+++++for+(int+i+=+0;+i+<+_to.length;+i%2B%2B)+{+
++++++addressTo[i]+=+new+InternetAddress(_to[i]);+
++++}+
++++++msg.setRecipients(MimeMessage.RecipientType.TO,+addressTo);+

++++msg.setSubject(_subject);+
++++msg.setSentDate(new+Date());+

++//+setup+message+body+
++BodyPart+messageBodyPart+=+new+MimeBodyPart();+
++++messageBodyPart.setText(_body);+
++++_multipart.addBodyPart(messageBodyPart);+

+++++//+Put+parts+in+message+
++++msg.setContent(_multipart);+

++++//+send+email+
++++Transport.send(msg);+

++++return+true;+
+++}+else+{+
+++++return+false;+
+++}+
++}+

+++public+void+addAttachment(String+filename)+throws+Exception+{+
++++BodyPart+messageBodyPart+=+new+MimeBodyPart();+
++++DataSource+source+=+new+FileDataSource(filename);+
++++++messageBodyPart.setDataHandler(new+DataHandler(source));+
++++messageBodyPart.setFileName(filename);+

+++_multipart.addBodyPart(messageBodyPart);+
+}+

++@Override+
++public+PasswordAuthentication+getPasswordAuthentication()+{+
+++++return+new+PasswordAuthentication(_user,+_pass);+
++}+

+++private+Properties+_setProperties()+{+
+++Properties+props+=+new+Properties();+

++++props.put("mail.smtp.host",+_host);+

++if(_debuggable)+{+
++++props.put("mail.debug",+"true");+
++}+

++if(_auth)+{+
++++props.put("mail.smtp.auth",+"true");+
+++}+

++++props.put("mail.smtp.port",+_port);+
++++props.put("mail.smtp.socketFactory.port",+_sport);+
++++props.put("mail.smtp.socketFactory.class",+"javax.net.ssl.SSLSocketFactory");+
++++props.put("mail.smtp.socketFactory.fallback",+"false");+

++++return+props;+
+++}+

+++//+the+getters+and+setters+
++public+String+getBody()+{+
+++return+_body;+
+}+

+public+void+setBody(String+_body)+{+
++this._body+=+_body;+
+}

++public+void+setTo(String[]+toArr)+{
+++++//+TODO+Auto-generated+method+stub
++++this._to=toArr;
+}

public+void+setFrom(String+string)+{
++++//+TODO+Auto-generated+method+stub
++++this._from=string;
}

+public+void+setSubject(String+string)+{
++++//+TODO+Auto-generated+method+stub
++++this._subject=string;
++}++


+++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2749171|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> Add jar files mail.jar,activation.jar,additionnal.jar

 String sub="Thank you for your online registration" ; 
 Mail m = new Mail("emailid", "password"); 

 String[] toArr = {"ekkatrainfo@gmail.com",sEmailId};
 m.setFrom("ekkatrainfo@gmail.com"); 

 m.setTo(toArr);
 m.setSubject(sub);
 m.setBody(msg);



 try{


 if(m.send()) { 

 } else { 

 } 
 } catch(Exception e) { 

 Log.e("MailApp", "Could not send email", e); 
 } 

 package com.example.ekktra;

 import java.util.Date;
 import java.util.Properties;

 import javax.activation.CommandMap;
 import javax.activation.DataHandler;
 import javax.activation.DataSource;
 import javax.activation.FileDataSource;
 import javax.activation.MailcapCommandMap;
 import javax.mail.BodyPart;
 import javax.mail.Multipart;
 import javax.mail.PasswordAuthentication;
 import javax.mail.Session;
 import javax.mail.Transport;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeBodyPart;
 import javax.mail.internet.MimeMessage;
 import javax.mail.internet.MimeMultipart;

 public class Mail extends javax.mail.Authenticator { 
 private String _user; 
 private String _pass; 

 private String[] _to; 

 private String _from; 

 private String _port; 
 private String _sport; 

 private String _host; 

 private String _subject; 
 private String _body; 

 private boolean _auth; 

 private boolean _debuggable; 

 private Multipart _multipart; 


 public Mail() { 
 _host = "smtp.gmail.com"; // default smtp server 
 _port = "465"; // default smtp port 
 _sport = "465"; // default socketfactory port 

 _user = ""; // username 
 _pass = ""; // password 
 _from = ""; // email sent from 
 _subject = ""; // email subject 
 _body = ""; // email body 

 _debuggable = false; // debug mode on or off - default off 
 _auth = true; // smtp authentication - default on 

 _multipart = new MimeMultipart(); 

 // There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added. 
 MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap(); 
 mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html"); 
 mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml"); 
 mc.addMailcap("text/plain;; x-java-content- handler=com.sun.mail.handlers.text_plain"); 
 mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
 mc.addMailcap("message/rfc822;; x-java-content- handler=com.sun.mail.handlers.message_rfc822"); 
 CommandMap.setDefaultCommandMap(mc); 
 } 

 public Mail(String user, String pass) { 
 this(); 

 _user = user; 
 _pass = pass; 
 } 

public boolean send() throws Exception { 
 Properties props = _setProperties(); 

 if(!_user.equals("") &amp;&amp; !_pass.equals("") &amp;&amp; _to.length &gt; 0 &amp;&amp; !_from.equals("") &amp;&amp; !_subject.equals("") /*&amp;&amp; !_body.equals("")*/) { 
 Session session = Session.getInstance(props, this); 

 MimeMessage msg = new MimeMessage(session); 

 msg.setFrom(new InternetAddress(_from)); 

 InternetAddress[] addressTo = new InternetAddress[_to.length]; 
 for (int i = 0; i &lt; _to.length; i++) { 
 addressTo[i] = new InternetAddress(_to[i]); 
 } 
 msg.setRecipients(MimeMessage.RecipientType.TO, addressTo); 

 msg.setSubject(_subject); 
 msg.setSentDate(new Date()); 

 // setup message body 
 BodyPart messageBodyPart = new MimeBodyPart(); 
 messageBodyPart.setText(_body); 
 _multipart.addBodyPart(messageBodyPart); 

 // Put parts in message 
 msg.setContent(_multipart); 

 // send email 
 Transport.send(msg); 

 return true; 
 } else { 
 return false; 
 } 
 } 

 public void addAttachment(String filename) throws Exception { 
 BodyPart messageBodyPart = new MimeBodyPart(); 
 DataSource source = new FileDataSource(filename); 
 messageBodyPart.setDataHandler(new DataHandler(source)); 
 messageBodyPart.setFileName(filename); 

 _multipart.addBodyPart(messageBodyPart); 
 } 

 @Override 
 public PasswordAuthentication getPasswordAuthentication() { 
 return new PasswordAuthentication(_user, _pass); 
 } 

 private Properties _setProperties() { 
 Properties props = new Properties(); 

 props.put("mail.smtp.host", _host); 

 if(_debuggable) { 
 props.put("mail.debug", "true"); 
 } 

 if(_auth) { 
 props.put("mail.smtp.auth", "true"); 
 } 

 props.put("mail.smtp.port", _port); 
 props.put("mail.smtp.socketFactory.port", _sport); 
 props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
 props.put("mail.smtp.socketFactory.fallback", "false"); 

 return props; 
 } 

 // the getters and setters 
 public String getBody() { 
 return _body; 
 } 

 public void setBody(String _body) { 
 this._body = _body; 
 }

 public void setTo(String[] toArr) {
 // TODO Auto-generated method stub
 this._to=toArr;
 }

public void setFrom(String string) {
 // TODO Auto-generated method stub
 this._from=string;
}

 public void setSubject(String string) {
 // TODO Auto-generated method stub
 this._subject=string;
 } 


 }
</code></pre>

blocks|key|2749173|text|用于发送带有附件的邮件..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749174|public+class+SendAttachment{
++++++++++++++++++++public+static+void+main(String+[]+args){+
+++++++++++++//to+address
++++++++++++++++++++String+to="abc@abc.com";//change+accordingly
++++++++++++++++++++//from+address
++++++++++++++++++++final+String+user="efg@efg.com";//change+accordingly
++++++++++++++++++++final+String+password="password";//change+accordingly+
+++++++++++++++++++++MailcapCommandMap+mc+=+(MailcapCommandMap)+CommandMap.getDefaultCommandMap();
+++++++++++++++++++mc.addMailcap("text/html;;+x-java-content-handler=com.sun.mail.handlers.text_html");
++++++++++++++++++mc.addMailcap("text/xml;;+x-java-content-handler=com.sun.mail.handlers.text_xml");
++++++++++++++++++mc.addMailcap("text/plain;;+x-java-content-handler=com.sun.mail.handlers.text_plain");
++++++++++++++++++mc.addMailcap("multipart/*;;+x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
++++++++++++++++++mc.addMailcap("message/rfc822;;+x-java-content-handler=com.sun.mail.handlers.message_rfc822");
++++++++++++++++++CommandMap.setDefaultCommandMap(mc);+
++++++++++++++++++//1)+get+the+session+object+++
++++++++++++++++++Properties+properties+=+System.getProperties();
++++++++++++++++++properties.put("mail.smtp.port",+"465");+
++++++++++++++++++properties.put("mail.smtp.host",+"smtp.gmail.com");
++++++++++++++++++++properties.put("mail.smtp.socketFactory.port",+"465");
++++++++++++++++++++properties.put("mail.smtp.socketFactory.class",
++++++++++++++++++++++++++++"javax.net.ssl.SSLSocketFactory");
++++++++++++++++++++properties.put("mail.smtp.auth",+"true");
++++++++++++++++++++properties.put("mail.smtp.port",+"465");

++++++++++++++++++Session+session+=+Session.getDefaultInstance(properties,
+++++++++++++++++++new+javax.mail.Authenticator()+{
+++++++++++++++++++protected+PasswordAuthentication+getPasswordAuthentication()+{
+++++++++++++++++++return+new+PasswordAuthentication(user,password);
+++++++++++++++++++}
++++++++++++++++++});

++++++++++++++++++//2)+compose+message+++
++++++++++++++++++try{+
++++++++++++++++++++MimeMessage+message+=+new+MimeMessage(session);
++++++++++++++++++++message.setFrom(new+InternetAddress(user));
++++++++++++++++++++message.addRecipient(Message.RecipientType.TO,new+InternetAddress(to));
++++++++++++++++++++message.setSubject("Hii");+
++++++++++++++++++++//3)+create+MimeBodyPart+object+and+set+your+message+content++++
++++++++++++++++++++BodyPart+messageBodyPart1+=+new+MimeBodyPart();
++++++++++++++++++++messageBodyPart1.setText("How+is+This");+
++++++++++++++++++++//4)+create+new+MimeBodyPart+object+and+set+DataHandler+object+to+this+object++++
++++++++++++++++++++MimeBodyPart+messageBodyPart2+=+new+MimeBodyPart();
++++++++++++++++//Location+of+file+to+be+attached
++++++++++++++++++++String+filename+=+Environment.getExternalStorageDirectory().getPath()%2B"/R2832.zip";//change+accordingly
++++++++++++++++++++DataSource+source+=+new+FileDataSource(filename);
++++++++++++++++++++messageBodyPart2.setDataHandler(new+DataHandler(source));
++++++++++++++++++++messageBodyPart2.setFileName("Hello");+
++++++++++++++++++++//5)+create+Multipart+object+and+add+MimeBodyPart+objects+to+this+object++++
++++++++++++++++++++Multipart+multipart+=+new+MimeMultipart();
++++++++++++++++++++multipart.addBodyPart(messageBodyPart1);
++++++++++++++++++++multipart.addBodyPart(messageBodyPart2);+
++++++++++++++++++++//6)+set+the+multiplart+object+to+the+message+object
++++++++++++++++++++message.setContent(multipart+);+
++++++++++++++++++++//7)+send+message+
++++++++++++++++++++Transport.send(message);+
+++++++++++++++++++System.out.println("MESSAGE+SENT....");
+++++++++++++++++++}catch+(MessagingException+ex)+{ex.printStackTrace();}
++++++++++++++++++}
++++++++++++++++}|code-block|syntax|javascript|2749175|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For sending a mail with attachment..

<pre><code>public class SendAttachment{
 public static void main(String [] args){ 
 //to address
 String to="abc@abc.com";//change accordingly
 //from address
 final String user="efg@efg.com";//change accordingly
 final String password="password";//change accordingly 
 MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
 mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
 mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
 mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
 mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
 mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
 CommandMap.setDefaultCommandMap(mc); 
 //1) get the session object 
 Properties properties = System.getProperties();
 properties.put("mail.smtp.port", "465"); 
 properties.put("mail.smtp.host", "smtp.gmail.com");
 properties.put("mail.smtp.socketFactory.port", "465");
 properties.put("mail.smtp.socketFactory.class",
 "javax.net.ssl.SSLSocketFactory");
 properties.put("mail.smtp.auth", "true");
 properties.put("mail.smtp.port", "465");

 Session session = Session.getDefaultInstance(properties,
 new javax.mail.Authenticator() {
 protected PasswordAuthentication getPasswordAuthentication() {
 return new PasswordAuthentication(user,password);
 }
 });

 //2) compose message 
 try{ 
 MimeMessage message = new MimeMessage(session);
 message.setFrom(new InternetAddress(user));
 message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
 message.setSubject("Hii"); 
 //3) create MimeBodyPart object and set your message content 
 BodyPart messageBodyPart1 = new MimeBodyPart();
 messageBodyPart1.setText("How is This"); 
 //4) create new MimeBodyPart object and set DataHandler object to this object 
 MimeBodyPart messageBodyPart2 = new MimeBodyPart();
 //Location of file to be attached
 String filename = Environment.getExternalStorageDirectory().getPath()+"/R2832.zip";//change accordingly
 DataSource source = new FileDataSource(filename);
 messageBodyPart2.setDataHandler(new DataHandler(source));
 messageBodyPart2.setFileName("Hello"); 
 //5) create Multipart object and add MimeBodyPart objects to this object 
 Multipart multipart = new MimeMultipart();
 multipart.addBodyPart(messageBodyPart1);
 multipart.addBodyPart(messageBodyPart2); 
 //6) set the multiplart object to the message object
 message.setContent(multipart ); 
 //7) send message 
 Transport.send(message); 
 System.out.println("MESSAGE SENT....");
 }catch (MessagingException ex) {ex.printStackTrace();}
 }
 }
</code></pre>

blocks|key|53719|text|如果使用"smtp.gmail.com“作为默认的smtp服务器，则会出现警告。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53720|由于谷歌过于热心的“可疑活动”政策，谷歌将迫使你频繁更改链接的电子邮件帐户密码。本质上，它将短时间内来自不同国家的重复smtp请求视为“可疑活动”。因为他们认为你(电子邮件帐户持有人)一次只能在一个国家。|53721|当google系统检测到“可疑活动”时，它将阻止进一步的电子邮件，直到您更改密码。因为你已经将密码硬编码到应用程序中，所以每次发生这种情况时，你都必须重新释放应用程序，这并不理想。这在一周内发生了三次，我甚至将密码存储在另一台服务器上，每次谷歌强迫我更改密码时，我都会动态获取密码。|53722|因此，我建议使用众多免费的smtp提供程序中的一个来避免这个安全问题，而不是使用"smtp.gmail.com“。使用相同的代码，但将"smtp.gmail.com“更改为新的smtp转发主机。|53723|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Word of warning if using "smtp.gmail.com" as the default smtp server. 

Google will force you to change your linked email account password frequently due to their over zealous "suspicious activity" polices. In essence it treats repeated smtp requests from different countries within a short time frame as "suspicious activity". As they assume you (the email account holder) can only be in one country at a time.

When google systems detect "suspicious activity" it will prevent further emails until you change the password. As you will have hard coded the password into the app you have to re-release the app each time this happens, not ideal. This happened 3 times in a week to me, I even stored the password on another server and dynamically fetched the password each time google forced me to change it.

So I recommend using one of the many free smtp providers instead of "smtp.gmail.com" to avoid this security problem. Use the same code but change "smtp.gmail.com" to your new smtp forwarding host.

blocks|key|2749223|text|无需用户干预，您可以发送如下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749224|2749225|从客户端apk发送电子邮件。这里需要mail.jar，activation.jar才能发送java电子邮件。如果添加这些jars，可能会增加APK大小。您可以在服务器端代码中使用web服务，它将使用相同的mail.jar和activation.jar来发送电子邮件。您可以通过异步任务调用web服务并发送电子邮件。请参阅相同的链接。|ordered-list-item|2749226|2749227|(但是，您需要知道邮件帐户的凭据)|2749228|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|L|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|M|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|J|$]]

Without user intervention, you can send as follows:

<ol>
<li>Send email from client apk. Here mail.jar, activation.jar is required to send java email. If these jars are added, it might increase the APK Size. </li>
<li>Alternatively, You can use a web-service at the server side code, which will use the same mail.jar and activation.jar to send email. You can call the web-service via asynctask and send email. Refer same link. </li>
</ol>

(But, you will need to know the credentials of the mail account)

blocks|key|2539242|text|如果需要保持jar库尽可能小，可以单独包含SMTP/POP3/IMAP函数，以避免“目录中的方法太多”的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2539243|您可以从the+javanet+web+page中选择想要的jar库，例如，mailapi.jar+%2B+imap.jar可以让您访问icloud、hotmail服务器。(在additional.jar和activation.jar的帮助下)|offset|length|2539244|entityMap|0|LINK|mutability|MUTABLE|url|https://java.net/projects/javamail/pages/Home^0|0|4|K|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

In case that you are demanded to keep the jar library as small as possible, you can include the SMTP/POP3/IMAP function separately to avoid the "too many methods in the dex" problem. 

You can choose the wanted jar libraries from <a href="https://java.net/projects/javamail/pages/Home" rel="nofollow">the javanet web page</a>, for example, mailapi.jar + imap.jar can enable you to access icloud, hotmail mail server in IMAP protocol. (with the help of additional.jar and activation.jar)

blocks|key|53760|text|那些正在获取ClassDefNotFoundError的人尝试将这三个jar文件移动到您项目的lib文件夹中，这对我很有效！！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|53761|entityMap^0|6|L|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Those who are getting <code>ClassDefNotFoundError</code> try to move that Three jar files to lib folder of your Project,it worked for me!!

blocks|key|2539276|text|我尝试使用@Vinayak+B提交的代码。但是，我收到一个错误消息:没有smtp提供程序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2539277|我为此创建了一个新问题，提供了更多信息|2539278|毕竟，我能够自己修复它。我不得不使用另一个mail.jar，并且我必须确保我的"access+for+less+secure+apps“已经打开。|offset|length|2539279|我希望这能帮助任何有同样问题的人。完成后，这段代码也可以在谷歌眼镜上运行。|2539280|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-eeplat-419426.html#javamail-1.4.7-oth-JPR|1|https://www.google.com/settings/security/lesssecureapps^0|0|0|L|8|0|14|R|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]|$F|Z|G|10|1|11]]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

I tried using the code that @Vinayak B submitted. However I'm getting an error saying: No provider for smtp

I created a new question for this with more information <a href="https://stackoverflow.com/questions/28693325/sending-email-in-google-glass">HERE</a>

I was able to fix it myself after all. I had to use an other <a href="http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-eeplat-419426.html#javamail-1.4.7-oth-JPR" rel="nofollow noreferrer">mail.jar</a>
and I had to make sure my "<a href="https://www.google.com/settings/security/lesssecureapps" rel="nofollow noreferrer">access for less secure apps</a>" was turned on.

I hope this helps anyone who has the same problem. With this done, this piece of code works on the google glass too.

blocks|key|53942|text|我无法运行Vinayak+B的代码。最后，我通过以下方式解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53943|1.使用这个|53944|2.应用AsyncTask。|53945|3.在this中更改发件人gmail帐户的安全问题(更改为打开)|offset|length|53946|entityMap|0|LINK|mutability|MUTABLE|url|https://www.google.com/settings/security/lesssecureapps^0|0|0|0|3|4|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

I am unable to run Vinayak B's code. Finally i solved this issue by following :

1.Using this

2.Applying AsyncTask.

3.Changing security issue of sender gmail account.(Change to "TURN ON") in <a href="https://www.google.com/settings/security/lesssecureapps" rel="nofollow noreferrer">this</a>

blocks|key|53422|text|带有演示的100%25工作代码您还可以使用此答案发送多封电子邮件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|53423|下载项目|53424|步骤1:下载邮件、激活、其他jar文件，并将其添加到android+studio中的项目库文件夹中。我添加了一个截图，请看下面的|53425|​|53426|📷|atomic|53427|53428|使用gmail登录(使用来自邮件的进行)和打开切换按钮LINK|53429|大多数人都忘记了这一步，我希望你不会。|53430|第2步:完成此过程后执行。将此类复制并传递到项目中。|53431|GMail.java|53432|import+android.util.Log;

import+java.io.UnsupportedEncodingException;
import+java.util.List;
import+java.util.Properties;

import+javax.mail.Message;
import+javax.mail.MessagingException;
import+javax.mail.Session;
import+javax.mail.Transport;
import+javax.mail.internet.AddressException;
import+javax.mail.internet.InternetAddress;
import+javax.mail.internet.MimeMessage;

public+class+GMail+{

++++final+String+emailPort+=+"587";//+gmail's+smtp+port
++++final+String+smtpAuth+=+"true";
++++final+String+starttls+=+"true";
++++final+String+emailHost+=+"smtp.gmail.com";


++++String+fromEmail;
++++String+fromPassword;
++++List<String>+toEmailList;
++++String+emailSubject;
++++String+emailBody;

++++Properties+emailProperties;
++++Session+mailSession;
++++MimeMessage+emailMessage;

++++public+GMail()+{

++++}

++++public+GMail(String+fromEmail,+String+fromPassword,
++++++++++++List<String>+toEmailList,+String+emailSubject,+String+emailBody)+{
++++++++this.fromEmail+=+fromEmail;
++++++++this.fromPassword+=+fromPassword;
++++++++this.toEmailList+=+toEmailList;
++++++++this.emailSubject+=+emailSubject;
++++++++this.emailBody+=+emailBody;

++++++++emailProperties+=+System.getProperties();
++++++++emailProperties.put("mail.smtp.port",+emailPort);
++++++++emailProperties.put("mail.smtp.auth",+smtpAuth);
++++++++emailProperties.put("mail.smtp.starttls.enable",+starttls);
++++++++Log.i("GMail",+"Mail+server+properties+set.");
++++}

++++public+MimeMessage+createEmailMessage()+throws+AddressException,
++++++++++++MessagingException,+UnsupportedEncodingException+{

++++++++mailSession+=+Session.getDefaultInstance(emailProperties,+null);
++++++++emailMessage+=+new+MimeMessage(mailSession);

++++++++emailMessage.setFrom(new+InternetAddress(fromEmail,+fromEmail));
++++++++for+(String+toEmail+:+toEmailList)+{
++++++++++++Log.i("GMail",+"toEmail:+"+%2B+toEmail);
++++++++++++emailMessage.addRecipient(Message.RecipientType.TO,
++++++++++++++++++++new+InternetAddress(toEmail));
++++++++}

++++++++emailMessage.setSubject(emailSubject);
++++++++emailMessage.setContent(emailBody,+"text/html");//+for+a+html+email
++++++++//+emailMessage.setText(emailBody);//+for+a+text+email
++++++++Log.i("GMail",+"Email+Message+created.");
++++++++return+emailMessage;
++++}

++++public+void+sendEmail()+throws+AddressException,+MessagingException+{

++++++++Transport+transport+=+mailSession.getTransport("smtp");
++++++++transport.connect(emailHost,+fromEmail,+fromPassword);
++++++++Log.i("GMail",+"allrecipients:+"+%2B+emailMessage.getAllRecipients());
++++++++transport.sendMessage(emailMessage,+emailMessage.getAllRecipients());
++++++++transport.close();
++++++++Log.i("GMail",+"Email+sent+successfully.");
++++}

}|code-block|syntax|javascript|53433|SendMailTask.java|53434|import+android.app.Activity;
import+android.app.ProgressDialog;
import+android.os.AsyncTask;
import+android.util.Log;

import+java.util.List;

public+class+SendMailTask+extends+AsyncTask+{

++++private+ProgressDialog+statusDialog;
++++private+Activity+sendMailActivity;

++++public+SendMailTask(Activity+activity)+{
++++++++sendMailActivity+=+activity;

++++}

++++protected+void+onPreExecute()+{
++++++++statusDialog+=+new+ProgressDialog(sendMailActivity);
++++++++statusDialog.setMessage("Getting+ready...");
++++++++statusDialog.setIndeterminate(false);
++++++++statusDialog.setCancelable(false);
++++++++statusDialog.show();
++++}

++++@Override
++++protected+Object+doInBackground(Object...+args)+{
++++++++try+{
++++++++++++Log.i("SendMailTask",+"About+to+instantiate+GMail...");
++++++++++++publishProgress("Processing+input....");
++++++++++++GMail+androidEmail+=+new+GMail(args[0].toString(),
++++++++++++++++++++args[1].toString(),+(List)+args[2],+args[3].toString(),
++++++++++++++++++++args[4].toString());
++++++++++++publishProgress("Preparing+mail+message....");
++++++++++++androidEmail.createEmailMessage();
++++++++++++publishProgress("Sending+email....");
++++++++++++androidEmail.sendEmail();
++++++++++++publishProgress("Email+Sent.");
++++++++++++Log.i("SendMailTask",+"Mail+Sent.");
++++++++}+catch+(Exception+e)+{
++++++++++++publishProgress(e.getMessage());
++++++++++++Log.e("SendMailTask",+e.getMessage(),+e);
++++++++}
++++++++return+null;
++++}

++++@Override
++++public+void+onProgressUpdate(Object...+values)+{
++++++++statusDialog.setMessage(values[0].toString());

++++}

++++@Override
++++public+void+onPostExecute(Object+result)+{
++++++++statusDialog.dismiss();
++++}

}|53435|第三步:现在你可以根据你的需要改变这个类，你也可以使用这个类发送多封邮件。我提供了xml和java文件。|53436|activity_main.xml|53437|<?xml+version="1.0"+encoding="utf-8"?>
<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++xmlns:tools="http://schemas.android.com/tools"
++++android:layout_width="match_parent"
++++android:layout_height="match_parent"
++++android:orientation="vertical"
++++android:paddingLeft="20dp"
++++android:paddingRight="20dp"
++++android:paddingTop="30dp">

++++<TextView
++++++++android:id="@%2Bid/textView1"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:paddingTop="10dp"
++++++++android:text="From+Email"+/>

++++<EditText
++++++++android:id="@%2Bid/editText1"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:background="#FFFFFF"
++++++++android:cursorVisible="true"
++++++++android:editable="true"
++++++++android:ems="10"
++++++++android:enabled="true"
++++++++android:inputType="textEmailAddress"
++++++++android:padding="5dp"
++++++++android:textColor="#000000">

++++++++<requestFocus+/>
++++</EditText>

++++<TextView
++++++++android:id="@%2Bid/textView2"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:paddingTop="10dp"
++++++++android:text="Password+(For+from+email)"+/>

++++<EditText
++++++++android:id="@%2Bid/editText2"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:background="#FFFFFF"
++++++++android:ems="10"
++++++++android:inputType="textPassword"
++++++++android:padding="5dp"
++++++++android:textColor="#000000"+/>

++++<TextView
++++++++android:id="@%2Bid/textView3"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:paddingTop="10dp"
++++++++android:text="To+Email"+/>

++++<EditText
++++++++android:id="@%2Bid/editText3"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:background="#ffffff"
++++++++android:ems="10"
++++++++android:inputType="textEmailAddress"
++++++++android:padding="5dp"
++++++++android:textColor="#000000"+/>

++++<TextView
++++++++android:id="@%2Bid/textView4"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:paddingTop="10dp"
++++++++android:text="Subject"+/>

++++<EditText
++++++++android:id="@%2Bid/editText4"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:background="#ffffff"
++++++++android:ems="10"
++++++++android:padding="5dp"
++++++++android:textColor="#000000"+/>

++++<TextView
++++++++android:id="@%2Bid/textView5"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:paddingTop="10dp"
++++++++android:text="Body"+/>

++++<EditText
++++++++android:id="@%2Bid/editText5"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:background="#ffffff"
++++++++android:ems="10"
++++++++android:inputType="textMultiLine"
++++++++android:padding="35dp"
++++++++android:textColor="#000000"+/>

++++<Button
++++++++android:id="@%2Bid/button1"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:text="Send+Email"+/>

</LinearLayout>|53438|SendMailActivity.java|53439|import+android.app.Activity;
import+android.os.Bundle;
import+android.util.Log;
import+android.view.View;
import+android.widget.Button;
import+android.widget.TextView;

import+java.util.Arrays;
import+java.util.List;

public+class+SendMailActivity+extends+Activity+{

++++@Override
++++public+void+onCreate(Bundle+savedInstanceState)+{
++++++++super.onCreate(savedInstanceState);
++++++++setContentView(R.layout.activity_main);
++++++++final+Button+send+=+(Button)+this.findViewById(R.id.button1);

++++++++send.setOnClickListener(new+View.OnClickListener()+{

++++++++++++public+void+onClick(View+v)+{
++++++++++++++++Log.i("SendMailActivity",+"Send+Button+Clicked.");

++++++++++++++++String+fromEmail+=+((TextView)+findViewById(R.id.editText1))
++++++++++++++++++++++++.getText().toString();
++++++++++++++++String+fromPassword+=+((TextView)+findViewById(R.id.editText2))
++++++++++++++++++++++++.getText().toString();
++++++++++++++++String+toEmails+=+((TextView)+findViewById(R.id.editText3))
++++++++++++++++++++++++.getText().toString();
++++++++++++++++List<String>+toEmailList+=+Arrays.asList(toEmails
++++++++++++++++++++++++.split("\\s*,\\s*"));
++++++++++++++++Log.i("SendMailActivity",+"To+List:+"+%2B+toEmailList);
++++++++++++++++String+emailSubject+=+((TextView)+findViewById(R.id.editText4))
++++++++++++++++++++++++.getText().toString();
++++++++++++++++String+emailBody+=+((TextView)+findViewById(R.id.editText5))
++++++++++++++++++++++++.getText().toString();
++++++++++++++++new+SendMailTask(SendMailActivity.this).execute(fromEmail,
++++++++++++++++++++++++fromPassword,+toEmailList,+emailSubject,+emailBody);
++++++++++++}
++++++++});
++++}
}|53440|注意不要忘记在AndroidManifest.xml文件中添加internet权限|53441|<uses-permission+android:name="android.permission.INTERNET"/>|CODE|53442|希望它能工作，如果它不工作，那么只需在下面评论即可。|53443|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/6fc4069be7b5dec2b6b059d912bde7d6.png|imageAlt|1|LINK|MUTABLE|url|https://www.google.com/settings/u/1/security/lesssecureapps^0|5|Q|0|0|0|4|16|6|0|0|0|1|0|0|0|J|C|R|4|1|0|0|J|0|0|Q|0|0|A|0|0|0|H|0|0|0|1G|0|0|H|0|0|0|L|0|0|0|15|0|0|1P|0|1P|0|0|Q|0^^$0|@$1|2|3|4|5|6|7|21|8|@$9|22|A|23|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|24|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|25|8|@$9|26|A|27|B|C]|$9|28|A|29|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|2A|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|2B|8|@]|D|@$9|2C|A|2D|1|2E]]|E|$]]|$1|O|3|K|5|6|7|2F|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|2G|8|@$9|2H|A|2I|B|C]]|D|@$9|2J|A|2K|1|2L]]|E|$]]|$1|R|3|S|5|6|7|2M|8|@$9|2N|A|2O|B|C]]|D|@]|E|$]]|$1|T|3|U|5|6|7|2P|8|@$9|2Q|A|2R|B|C]]|D|@]|E|$]]|$1|V|3|W|5|6|7|2S|8|@$9|2T|A|2U|B|C]]|D|@]|E|$]]|$1|X|3|Y|5|Z|7|2V|8|@]|D|@]|E|$10|11]]|$1|12|3|13|5|6|7|2W|8|@$9|2X|A|2Y|B|C]]|D|@]|E|$]]|$1|14|3|15|5|Z|7|2Z|8|@]|D|@]|E|$10|11]]|$1|16|3|17|5|6|7|30|8|@$9|31|A|32|B|C]]|D|@]|E|$]]|$1|18|3|19|5|6|7|33|8|@$9|34|A|35|B|C]]|D|@]|E|$]]|$1|1A|3|1B|5|Z|7|36|8|@]|D|@]|E|$10|11]]|$1|1C|3|1D|5|6|7|37|8|@$9|38|A|39|B|C]]|D|@]|E|$]]|$1|1E|3|1F|5|Z|7|3A|8|@]|D|@]|E|$10|11]]|$1|1G|3|1H|5|6|7|3B|8|@$9|3C|A|3D|B|C]]|D|@]|E|$]]|$1|1I|3|1J|5|6|7|3E|8|@$9|3F|A|3G|B|C]|$9|3H|A|3I|B|1K]]|D|@]|E|$]]|$1|1L|3|1M|5|6|7|3J|8|@$9|3K|A|3L|B|C]]|D|@]|E|$]]|$1|1N|3|-4|5|6|7|3M|8|@]|D|@]|E|$]]]|1O|$1P|$5|1Q|1R|1S|E|$1T|1U|1V|-4]]|1W|$5|1X|1R|1Y|E|$1Z|20]]]]

100% working code with demo You can also send multiple emails using this answer.
Download Project <a href="https://github.com/arpit999/SendMail" rel="nofollow noreferrer">HERE</a>
Step 1: Download mail, activation, additional jar files and add in your project libs folder in android studio. I added a screenshot see below <a href="https://code.google.com/archive/p/javamail-android/downloads" rel="nofollow noreferrer">Download link</a>
<a href="https://i.stack.imgur.com/CCnFj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CCnFj.png" alt="libs add" /></a>
Login with gmail (using your from mail) and TURN ON toggle button <a href="https://www.google.com/settings/u/1/security/lesssecureapps" rel="nofollow noreferrer">LINK</a>
Most of the people forget about this step i hope you will not.
Step 2 : After completing this process. Copy and past this classes into your project.
GMail.java
<pre><code>import android.util.Log;

import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class GMail {

 final String emailPort = &quot;587&quot;;// gmail's smtp port
 final String smtpAuth = &quot;true&quot;;
 final String starttls = &quot;true&quot;;
 final String emailHost = &quot;smtp.gmail.com&quot;;


 String fromEmail;
 String fromPassword;
 List&lt;String&gt; toEmailList;
 String emailSubject;
 String emailBody;

 Properties emailProperties;
 Session mailSession;
 MimeMessage emailMessage;

 public GMail() {

 }

 public GMail(String fromEmail, String fromPassword,
 List&lt;String&gt; toEmailList, String emailSubject, String emailBody) {
 this.fromEmail = fromEmail;
 this.fromPassword = fromPassword;
 this.toEmailList = toEmailList;
 this.emailSubject = emailSubject;
 this.emailBody = emailBody;

 emailProperties = System.getProperties();
 emailProperties.put(&quot;mail.smtp.port&quot;, emailPort);
 emailProperties.put(&quot;mail.smtp.auth&quot;, smtpAuth);
 emailProperties.put(&quot;mail.smtp.starttls.enable&quot;, starttls);
 Log.i(&quot;GMail&quot;, &quot;Mail server properties set.&quot;);
 }

 public MimeMessage createEmailMessage() throws AddressException,
 MessagingException, UnsupportedEncodingException {

 mailSession = Session.getDefaultInstance(emailProperties, null);
 emailMessage = new MimeMessage(mailSession);

 emailMessage.setFrom(new InternetAddress(fromEmail, fromEmail));
 for (String toEmail : toEmailList) {
 Log.i(&quot;GMail&quot;, &quot;toEmail: &quot; + toEmail);
 emailMessage.addRecipient(Message.RecipientType.TO,
 new InternetAddress(toEmail));
 }

 emailMessage.setSubject(emailSubject);
 emailMessage.setContent(emailBody, &quot;text/html&quot;);// for a html email
 // emailMessage.setText(emailBody);// for a text email
 Log.i(&quot;GMail&quot;, &quot;Email Message created.&quot;);
 return emailMessage;
 }

 public void sendEmail() throws AddressException, MessagingException {

 Transport transport = mailSession.getTransport(&quot;smtp&quot;);
 transport.connect(emailHost, fromEmail, fromPassword);
 Log.i(&quot;GMail&quot;, &quot;allrecipients: &quot; + emailMessage.getAllRecipients());
 transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
 transport.close();
 Log.i(&quot;GMail&quot;, &quot;Email sent successfully.&quot;);
 }

}
</code></pre>
SendMailTask.java
<pre><code>import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.util.Log;

import java.util.List;

public class SendMailTask extends AsyncTask {

 private ProgressDialog statusDialog;
 private Activity sendMailActivity;

 public SendMailTask(Activity activity) {
 sendMailActivity = activity;

 }

 protected void onPreExecute() {
 statusDialog = new ProgressDialog(sendMailActivity);
 statusDialog.setMessage(&quot;Getting ready...&quot;);
 statusDialog.setIndeterminate(false);
 statusDialog.setCancelable(false);
 statusDialog.show();
 }

 @Override
 protected Object doInBackground(Object... args) {
 try {
 Log.i(&quot;SendMailTask&quot;, &quot;About to instantiate GMail...&quot;);
 publishProgress(&quot;Processing input....&quot;);
 GMail androidEmail = new GMail(args[0].toString(),
 args[1].toString(), (List) args[2], args[3].toString(),
 args[4].toString());
 publishProgress(&quot;Preparing mail message....&quot;);
 androidEmail.createEmailMessage();
 publishProgress(&quot;Sending email....&quot;);
 androidEmail.sendEmail();
 publishProgress(&quot;Email Sent.&quot;);
 Log.i(&quot;SendMailTask&quot;, &quot;Mail Sent.&quot;);
 } catch (Exception e) {
 publishProgress(e.getMessage());
 Log.e(&quot;SendMailTask&quot;, e.getMessage(), e);
 }
 return null;
 }

 @Override
 public void onProgressUpdate(Object... values) {
 statusDialog.setMessage(values[0].toString());

 }

 @Override
 public void onPostExecute(Object result) {
 statusDialog.dismiss();
 }

}
</code></pre>
Step 3 :
Now you can change this class according to your needs also you can send multiple mail using this class. i provide xml and java file both.
activity_main.xml
<pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
 xmlns:tools=&quot;http://schemas.android.com/tools&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;match_parent&quot;
 android:orientation=&quot;vertical&quot;
 android:paddingLeft=&quot;20dp&quot;
 android:paddingRight=&quot;20dp&quot;
 android:paddingTop=&quot;30dp&quot;&gt;

 &lt;TextView
 android:id=&quot;@+id/textView1&quot;
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:paddingTop=&quot;10dp&quot;
 android:text=&quot;From Email&quot; /&gt;

 &lt;EditText
 android:id=&quot;@+id/editText1&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:background=&quot;#FFFFFF&quot;
 android:cursorVisible=&quot;true&quot;
 android:editable=&quot;true&quot;
 android:ems=&quot;10&quot;
 android:enabled=&quot;true&quot;
 android:inputType=&quot;textEmailAddress&quot;
 android:padding=&quot;5dp&quot;
 android:textColor=&quot;#000000&quot;&gt;

 &lt;requestFocus /&gt;
 &lt;/EditText&gt;

 &lt;TextView
 android:id=&quot;@+id/textView2&quot;
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:paddingTop=&quot;10dp&quot;
 android:text=&quot;Password (For from email)&quot; /&gt;

 &lt;EditText
 android:id=&quot;@+id/editText2&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:background=&quot;#FFFFFF&quot;
 android:ems=&quot;10&quot;
 android:inputType=&quot;textPassword&quot;
 android:padding=&quot;5dp&quot;
 android:textColor=&quot;#000000&quot; /&gt;

 &lt;TextView
 android:id=&quot;@+id/textView3&quot;
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:paddingTop=&quot;10dp&quot;
 android:text=&quot;To Email&quot; /&gt;

 &lt;EditText
 android:id=&quot;@+id/editText3&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:background=&quot;#ffffff&quot;
 android:ems=&quot;10&quot;
 android:inputType=&quot;textEmailAddress&quot;
 android:padding=&quot;5dp&quot;
 android:textColor=&quot;#000000&quot; /&gt;

 &lt;TextView
 android:id=&quot;@+id/textView4&quot;
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:paddingTop=&quot;10dp&quot;
 android:text=&quot;Subject&quot; /&gt;

 &lt;EditText
 android:id=&quot;@+id/editText4&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:background=&quot;#ffffff&quot;
 android:ems=&quot;10&quot;
 android:padding=&quot;5dp&quot;
 android:textColor=&quot;#000000&quot; /&gt;

 &lt;TextView
 android:id=&quot;@+id/textView5&quot;
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:paddingTop=&quot;10dp&quot;
 android:text=&quot;Body&quot; /&gt;

 &lt;EditText
 android:id=&quot;@+id/editText5&quot;
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:background=&quot;#ffffff&quot;
 android:ems=&quot;10&quot;
 android:inputType=&quot;textMultiLine&quot;
 android:padding=&quot;35dp&quot;
 android:textColor=&quot;#000000&quot; /&gt;

 &lt;Button
 android:id=&quot;@+id/button1&quot;
 android:layout_width=&quot;wrap_content&quot;
 android:layout_height=&quot;wrap_content&quot;
 android:text=&quot;Send Email&quot; /&gt;

&lt;/LinearLayout&gt;
</code></pre>
SendMailActivity.java
<pre><code>import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.Arrays;
import java.util.List;

public class SendMailActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 final Button send = (Button) this.findViewById(R.id.button1);

 send.setOnClickListener(new View.OnClickListener() {

 public void onClick(View v) {
 Log.i(&quot;SendMailActivity&quot;, &quot;Send Button Clicked.&quot;);

 String fromEmail = ((TextView) findViewById(R.id.editText1))
 .getText().toString();
 String fromPassword = ((TextView) findViewById(R.id.editText2))
 .getText().toString();
 String toEmails = ((TextView) findViewById(R.id.editText3))
 .getText().toString();
 List&lt;String&gt; toEmailList = Arrays.asList(toEmails
 .split(&quot;\\s*,\\s*&quot;));
 Log.i(&quot;SendMailActivity&quot;, &quot;To List: &quot; + toEmailList);
 String emailSubject = ((TextView) findViewById(R.id.editText4))
 .getText().toString();
 String emailBody = ((TextView) findViewById(R.id.editText5))
 .getText().toString();
 new SendMailTask(SendMailActivity.this).execute(fromEmail,
 fromPassword, toEmailList, emailSubject, emailBody);
 }
 });
 }
}
</code></pre>
Note Dont forget to add internet permission in your AndroidManifest.xml file
<code>&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot;/&gt;</code>
Hope it work if it not then just comment down below.

blocks|key|2539413|text|其他答案中提供的所有代码都是正确的，工作正常，但有点乱，所以我决定发布一个库(尽管仍在开发中)，以便以更简单的方式使用它：。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2539414|您只需创建一个MailSender，构建一个邮件并发送它(已经通过AsyncTask在后台处理过了)。|2539415|MailSender+mailSender+=+new+MailSender(email,+password);

Mail.MailBuilder+builder+=+new+Mail.MailBuilder();
Mail+mail+=+builder
++++.setSender(senderMail)
++++.addRecipient(new+Recipient(recipient))
++++.setText("Hello")
++++.build();

mailSender.sendMail(mail);|code-block|syntax|javascript|2539416|您可以收到已发送电子邮件的通知，它还支持不同的收件人类型(收件人、抄送和密件抄送)、附件和html：|2539417|MailSender+mailSender+=+new+MailSender(email,+password);

Mail.MailBuilder+builder+=+new+Mail.MailBuilder();
Mail+mail+=+builder
++++.setSender(senderMail)
++++.addRecipient(new+Recipient(recipient))
++++.addRecipient(new+Recipient(Recipient.TYPE.CC,+recipientCC))
++++.setText("Hello")
++++.setHtml("<h1+style=\"color:red;\">Hello</h1>")
++++.addAttachment(new+Attachment(filePath,+fileName))
++++.build();

mailSender.sendMail(mail,+new+MailSender.OnMailSentListener()+{

++++@Override
++++public+void+onSuccess()+{
++++++++//+mail+sent!
++++}

++++@Override
++++public+void+onError(Exception+error)+{
++++++++//+something+bad+happened+:(
++++}
});|2539418|你可以通过Gradle或Maven获得它：|2539419|compile+'it.enricocandino:androidmail:1.0.0-SNAPSHOT'|2539420|如果您有任何问题，请告诉我！:)|2539421|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

All the code provided in the other answers is correct and is working fine, but a bit messy, so I decided to publish a library (still in development though) to use it in a easier way: <a href="https://github.com/enrichman/androidmail" rel="nofollow">AndroidMail</a>.

You have just to create a MailSender, build a mail and send it (already handled in background with an AsyncTask).

<pre><code>MailSender mailSender = new MailSender(email, password);

Mail.MailBuilder builder = new Mail.MailBuilder();
Mail mail = builder
 .setSender(senderMail)
 .addRecipient(new Recipient(recipient))
 .setText("Hello")
 .build();

mailSender.sendMail(mail);
</code></pre>

You can receive a notification for the email sent and it has also the support for different Recipients types (TO, CC and BCC), attachments and html:

<pre><code>MailSender mailSender = new MailSender(email, password);

Mail.MailBuilder builder = new Mail.MailBuilder();
Mail mail = builder
 .setSender(senderMail)
 .addRecipient(new Recipient(recipient))
 .addRecipient(new Recipient(Recipient.TYPE.CC, recipientCC))
 .setText("Hello")
 .setHtml("&lt;h1 style=\"color:red;\"&gt;Hello&lt;/h1&gt;")
 .addAttachment(new Attachment(filePath, fileName))
 .build();

mailSender.sendMail(mail, new MailSender.OnMailSentListener() {

 @Override
 public void onSuccess() {
 // mail sent!
 }

 @Override
 public void onError(Exception error) {
 // something bad happened :(
 }
});
</code></pre>

You can get it via Gradle or Maven:

<pre><code>compile 'it.enricocandino:androidmail:1.0.0-SNAPSHOT'
</code></pre>

Please let me know if you have any issue with it! :)

blocks|key|2539430|text|要添加附件，请不要忘记添加。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2539431|MailcapCommandMap+mc+=+(MailcapCommandMap)+CommandMap
++++++++++++.getDefaultCommandMap();
++++mc.addMailcap("text/html;;+x-java-content-handler=com.sun.mail.handlers.text_html");
++++mc.addMailcap("text/xml;;+x-java-content-handler=com.sun.mail.handlers.text_xml");
++++mc.addMailcap("text/plain;;+x-java-content-handler=com.sun.mail.handlers.text_plain");
++++mc.addMailcap("multipart/*;;+x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
++++mc.addMailcap("message/rfc822;;+x-java-content-handler=com.sun.mail.handlers.message_rfc822");
++++CommandMap.setDefaultCommandMap(mc);|code-block|syntax|javascript|2539432|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To add attachment, don't forget to add. 

<pre><code>MailcapCommandMap mc = (MailcapCommandMap) CommandMap
 .getDefaultCommandMap();
 mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
 mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
 mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
 mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
 mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
 CommandMap.setDefaultCommandMap(mc);
</code></pre>

blocks|key|55057|text|我为其他需要帮助的人找到了一个更短的替代方案。代码是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|55058|package+com.example.mail;

import+java.util.Properties;

import+javax.mail.Message;
import+javax.mail.MessagingException;
import+javax.mail.PasswordAuthentication;
import+javax.mail.Session;
import+javax.mail.Transport;
import+javax.mail.internet.InternetAddress;
import+javax.mail.internet.MimeMessage;

public+class+SendMailTLS+{

++++public+static+void+main(String[]+args)+{

++++++++final+String+username+=+"username@gmail.com";
++++++++final+String+password+=+"password";

++++++++Properties+props+=+new+Properties();
++++++++props.put("mail.smtp.auth",+"true");
++++++++props.put("mail.smtp.starttls.enable",+"true");
++++++++props.put("mail.smtp.host",+"smtp.gmail.com");
++++++++props.put("mail.smtp.port",+"587");

++++++++Session+session+=+Session.getInstance(props,
++++++++++new+javax.mail.Authenticator()+{
++++++++++++protected+PasswordAuthentication+getPasswordAuthentication()+{
++++++++++++++++return+new+PasswordAuthentication("username",+"password");
++++++++++++}
++++++++++});

++++++++try+{

++++++++++++Message+message+=+new+MimeMessage(session);
++++++++++++message.setFrom(new+InternetAddress("from-email@gmail.com"));
++++++++++++message.setRecipients(Message.RecipientType.TO,
++++++++++++++++InternetAddress.parse("to-email@gmail.com"));
++++++++++++message.setSubject("Testing+Subject");
++++++++++++message.setText("Dear+Mail+Crawler,"
++++++++++++++++%2B+"\n\n+No+spam+to+my+email,+please!");

++++++++++++Transport.send(message);

++++++++++++System.out.println("Done");

++++++++}+catch+(MessagingException+e)+{
++++++++++++throw+new+RuntimeException(e);
++++++++}
++++}
}|code-block|syntax|javascript|55059|来源：Sending+Email+via+JavaMail+API|offset|length|55060|希望这能有所帮助！祝好运!|55061|entityMap|0|LINK|mutability|MUTABLE|url|https://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example/^0|0|0|3|U|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]]|A|$]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

I found a shorter alternative for others who need help. The code is:

<pre><code>package com.example.mail;

import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendMailTLS {

 public static void main(String[] args) {

 final String username = "username@gmail.com";
 final String password = "password";

 Properties props = new Properties();
 props.put("mail.smtp.auth", "true");
 props.put("mail.smtp.starttls.enable", "true");
 props.put("mail.smtp.host", "smtp.gmail.com");
 props.put("mail.smtp.port", "587");

 Session session = Session.getInstance(props,
 new javax.mail.Authenticator() {
 protected PasswordAuthentication getPasswordAuthentication() {
 return new PasswordAuthentication("username", "password");
 }
 });

 try {

 Message message = new MimeMessage(session);
 message.setFrom(new InternetAddress("from-email@gmail.com"));
 message.setRecipients(Message.RecipientType.TO,
 InternetAddress.parse("to-email@gmail.com"));
 message.setSubject("Testing Subject");
 message.setText("Dear Mail Crawler,"
 + "\n\n No spam to my email, please!");

 Transport.send(message);

 System.out.println("Done");

 } catch (MessagingException e) {
 throw new RuntimeException(e);
 }
 }
}
</code></pre>

Source: <a href="https://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example/" rel="noreferrer">Sending Email via JavaMail API</a>

Hope this Helps! Good Luck!

blocks|key|53504|text|使用Kotlin以编程方式发送电子邮件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53505|简单的电子邮件发送，而不是所有其他功能(如attachments).|53506|TLS+|unordered-list-item|53507|on|53508|也只需要1个gradle电子邮件依赖项。|53509|53510|53511|我还发现这个电子邮件流行服务的列表真的很有帮助：|53512|https://support.office.com/en-gb/article/pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353|offset|length|53513|使用方法：|53514|++++val+auth+=+EmailService.UserPassAuthenticator("you@gmail.com",+"yourPassword")
++++val+to+=+listOf(InternetAddress("to@email.com"))
++++val+from+=+InternetAddress("you@gmail.com")
++++val+email+=+EmailService.Email(auth,+to,+from,+"Test+Subject",+"Hello+Body+World")
++++val+emailService+=+EmailService("smtp.gmail.com",+465)
++++
++++GlobalScope.launch+{+//+or+however+you+do+background+threads
++++++++emailService.send(email)
++++}|code-block|syntax|javascript|53515|代码：|53516|import+java.util.*
import+javax.mail.*
import+javax.mail.internet.InternetAddress
import+javax.mail.internet.MimeBodyPart
import+javax.mail.internet.MimeMessage
import+javax.mail.internet.MimeMultipart

class+EmailService(private+val+server:+String,+private+val+port:+Int)+{

++++data+class+Email(
++++++++val+auth:+Authenticator,
++++++++val+toList:+List<InternetAddress>,
++++++++val+from:+Address,
++++++++val+subject:+String,
++++++++val+body:+String
++++)

++++class+UserPassAuthenticator(private+val+username:+String,+private+val+password:+String)+:+Authenticator()+{
++++++++override+fun+getPasswordAuthentication():+PasswordAuthentication+{
++++++++++++return+PasswordAuthentication(username,+password)
++++++++}
++++}

++++fun+send(email:+Email)+{
++++++++val+props+=+Properties()
++++++++props["mail.smtp.auth"]+=+"true"
++++++++props["mail.user"]+=+email.from
++++++++props["mail.smtp.host"]+=+server
++++++++props["mail.smtp.port"]+=+port
++++++++props["mail.smtp.starttls.enable"]+=+"true"
++++++++props["mail.smtp.ssl.trust"]+=+server
++++++++props["mail.mime.charset"]+=+"UTF-8"
++++++++val+msg:+Message+=+MimeMessage(Session.getDefaultInstance(props,+email.auth))
++++++++msg.setFrom(email.from)
++++++++msg.sentDate+=+Calendar.getInstance().time
++++++++msg.setRecipients(Message.RecipientType.TO,+email.toList.toTypedArray())
//++++++msg.setRecipients(Message.RecipientType.CC,+email.ccList.toTypedArray())
//++++++msg.setRecipients(Message.RecipientType.BCC,+email.bccList.toTypedArray())
++++++++msg.replyTo+=+arrayOf(email.from)

++++++++msg.addHeader("X-Mailer",+CLIENT_NAME)
++++++++msg.addHeader("Precedence",+"bulk")
++++++++msg.subject+=+email.subject

++++++++msg.setContent(MimeMultipart().apply+{
++++++++++++addBodyPart(MimeBodyPart().apply+{
++++++++++++++++setText(email.body,+"iso-8859-1")
++++++++++++++++//setContent(email.htmlBody,+"text/html;+charset=UTF-8")
++++++++++++})
++++++++})
++++++++Transport.send(msg)
++++}

++++companion+object+{
++++++++const+val+CLIENT_NAME+=+"Android+StackOverflow+programmatic+email"
++++}
}|53517|Gradle：|53518|dependencies+{
++++implementation+'com.sun.mail:android-mail:1.6.4'
++++implementation+"org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3"
}|53519|AndroidManifest：|53520|<uses-permission+android:name="android.permission.INTERNET"+/>|53521|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|0|0|39|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1J|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1K|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|1L|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|1M|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1P|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1Q|8|@]|9|@$Q|1R|R|1S|1|1T]]|A|$]]|$1|S|3|T|5|6|7|1U|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|1V|8|@]|9|@]|A|$X|Y]]|$1|Z|3|10|5|6|7|1W|8|@]|9|@]|A|$]]|$1|11|3|12|5|W|7|1X|8|@]|9|@]|A|$X|Y]]|$1|13|3|14|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|15|3|16|5|W|7|1Z|8|@]|9|@]|A|$X|Y]]|$1|17|3|18|5|6|7|20|8|@]|9|@]|A|$]]|$1|19|3|1A|5|W|7|21|8|@]|9|@]|A|$X|Y]]|$1|1B|3|-4|5|6|7|22|8|@]|9|@]|A|$]]]|1C|$1D|$5|1E|1F|1G|A|$1H|P]]]]

Sending email programmatically with Kotlin.
<ul>
<li>simple email sending, not all the other features (like attachments).</li>
<li>TLS is always on</li>
<li>Only 1 gradle email dependency needed also.</li>
</ul>
I also found this list of email POP services really helpful:
<a href="https://support.office.com/en-gb/article/pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353" rel="nofollow noreferrer">https://support.office.com/en-gb/article/pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353</a>
How to use:
<pre><code> val auth = EmailService.UserPassAuthenticator(&quot;you@gmail.com&quot;, &quot;yourPassword&quot;)
 val to = listOf(InternetAddress(&quot;to@email.com&quot;))
 val from = InternetAddress(&quot;you@gmail.com&quot;)
 val email = EmailService.Email(auth, to, from, &quot;Test Subject&quot;, &quot;Hello Body World&quot;)
 val emailService = EmailService(&quot;smtp.gmail.com&quot;, 465)
 
 GlobalScope.launch { // or however you do background threads
 emailService.send(email)
 }
</code></pre>
The code:
<pre><code>import java.util.*
import javax.mail.*
import javax.mail.internet.InternetAddress
import javax.mail.internet.MimeBodyPart
import javax.mail.internet.MimeMessage
import javax.mail.internet.MimeMultipart

class EmailService(private val server: String, private val port: Int) {

 data class Email(
 val auth: Authenticator,
 val toList: List&lt;InternetAddress&gt;,
 val from: Address,
 val subject: String,
 val body: String
 )

 class UserPassAuthenticator(private val username: String, private val password: String) : Authenticator() {
 override fun getPasswordAuthentication(): PasswordAuthentication {
 return PasswordAuthentication(username, password)
 }
 }

 fun send(email: Email) {
 val props = Properties()
 props[&quot;mail.smtp.auth&quot;] = &quot;true&quot;
 props[&quot;mail.user&quot;] = email.from
 props[&quot;mail.smtp.host&quot;] = server
 props[&quot;mail.smtp.port&quot;] = port
 props[&quot;mail.smtp.starttls.enable&quot;] = &quot;true&quot;
 props[&quot;mail.smtp.ssl.trust&quot;] = server
 props[&quot;mail.mime.charset&quot;] = &quot;UTF-8&quot;
 val msg: Message = MimeMessage(Session.getDefaultInstance(props, email.auth))
 msg.setFrom(email.from)
 msg.sentDate = Calendar.getInstance().time
 msg.setRecipients(Message.RecipientType.TO, email.toList.toTypedArray())
// msg.setRecipients(Message.RecipientType.CC, email.ccList.toTypedArray())
// msg.setRecipients(Message.RecipientType.BCC, email.bccList.toTypedArray())
 msg.replyTo = arrayOf(email.from)

 msg.addHeader(&quot;X-Mailer&quot;, CLIENT_NAME)
 msg.addHeader(&quot;Precedence&quot;, &quot;bulk&quot;)
 msg.subject = email.subject

 msg.setContent(MimeMultipart().apply {
 addBodyPart(MimeBodyPart().apply {
 setText(email.body, &quot;iso-8859-1&quot;)
 //setContent(email.htmlBody, &quot;text/html; charset=UTF-8&quot;)
 })
 })
 Transport.send(msg)
 }

 companion object {
 const val CLIENT_NAME = &quot;Android StackOverflow programmatic email&quot;
 }
}
</code></pre>
Gradle:
<pre><code>dependencies {
 implementation 'com.sun.mail:android-mail:1.6.4'
 implementation &quot;org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3&quot;
}
</code></pre>
AndroidManifest:
<pre><code>&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;
</code></pre>

blocks|key|2749557|text|这里有很多解决方案。然而，我认为我们必须更改GMail的配置，以允许从安全性较低的设备进行访问。转到下面的链接并启用它。对我来说很管用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2749558|https://myaccount.google.com/lesssecureapps?pli=1|offset|length|2749559|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Here are a lot solutions. However I think we must change the configuration of the GMail to allow accessing from less secure devices. Go to the link below and enable it. It works for me

<a href="https://myaccount.google.com/lesssecureapps?pli=1" rel="nofollow noreferrer">https://myaccount.google.com/lesssecureapps?pli=1</a>

blocks|key|54066|text|package+io.formics.tourguide

import+android.annotation.SuppressLint
import+android.content.Intent
import+android.net.Credentials
import+android.net.Uri
import+androidx.appcompat.app.AppCompatActivity
import+android.os.Bundle
import+android.util.Log
import+android.widget.Toast
import+kotlinx.android.synthetic.main.activity_feedback.*
import+org.jetbrains.annotations.Async
import+java.lang.Exception

import+java.util.Properties;


import+javax.activation.DataHandler;
import+javax.activation.FileDataSource
import+javax.mail.*
import+javax.mail.internet.*


class+FeedbackActivity+:+AppCompatActivity()++{
++
++++val+props+=+Properties()


++++override+fun+onCreate(savedInstanceState:+Bundle?)+{
++++++++super.onCreate(savedInstanceState)
++++++++setContentView(R.layout.activity_feedback)

++++++++props.put("mail.smtp.auth",+"true");
++++++++props.put("mail.smtp.starttls.enable",+"true");
++++++++props.put("mail.smtp.host",+"smtp.gmail.com");
++++++++props.put("mail.smtp.port",+"587");

++++++++btnSendEmail.setOnClickListener+{
++++++++++++Thread+{
++++++++++++++++try+{
++++++++++++++++++++sendEmail()
++++++++++++++++++++//+Your+implementation
++++++++++++++++}+catch+(ex:+Exception)+{
++++++++++++++++++++ex.printStackTrace()
++++++++++++++++}
++++++++++++}.start()


++++++++}
++++}


++++private+fun+sendEmail()+{



++++++++try+{

++++++++++++val+session+=+Session.getInstance(props,
++++++++++++++++object+:+javax.mail.Authenticator()+{
++++++++++++++++++++//Authenticating+the+password
++++++++++++++++++++override+fun+getPasswordAuthentication():+javax.mail.PasswordAuthentication+{
++++++++++++++++++++++++return+PasswordAuthentication("abc@xyz.com",+"password")
++++++++++++++++++++}
++++++++++++++++})

++++++++++++val+message+=+MimeMessage(session);
++++++++++++message.setFrom(InternetAddress("abc@xyz.com"));
++++++++++++message.setRecipients(
++++++++++++++++Message.RecipientType.TO,
++++++++++++++++InternetAddress.parse(editCC.text.toString())
++++++++++++)
++++++++++++message.subject+=+editSubject.text.toString()
++++++++++++message.setText(
++++++++++++++++"Dear+Mail+Crawler,"
++++++++++++++++++++++++%2B+"\n\n+No+spam+to+my+email,+please!"
++++++++++++);

++++++++++++//val+messageBodyPart+=+MimeBodyPart();

++++++++++++//val+multipart+=+MimeMultipart();

++++++++++++//val+file+=+"path+of+file+to+be+attached";

//++++++++++++val+fileName+=+"attachmentName"
+++++++++++//+val+source+=+FileDataSource(file);
++++++++++++//messageBodyPart.setDataHandler(DataHandler(source));
++++++++++++//messageBodyPart.setFileName(fileName);
++++++++++++//multipart.addBodyPart(messageBodyPart);

++++++++++++//message.setContent(multipart);

++++++++++++Transport.send(message);
++++++++++++System.out.println("Done");



++++++++}+catch+(e:+MessagingException)+{
++++++++++++throw++RuntimeException(e);
++++++++}

+++++++++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|54067|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>package io.formics.tourguide

import android.annotation.SuppressLint
import android.content.Intent
import android.net.Credentials
import android.net.Uri
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_feedback.*
import org.jetbrains.annotations.Async
import java.lang.Exception

import java.util.Properties;


import javax.activation.DataHandler;
import javax.activation.FileDataSource
import javax.mail.*
import javax.mail.internet.*


class FeedbackActivity : AppCompatActivity() {
 
 val props = Properties()


 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_feedback)

 props.put(&quot;mail.smtp.auth&quot;, &quot;true&quot;);
 props.put(&quot;mail.smtp.starttls.enable&quot;, &quot;true&quot;);
 props.put(&quot;mail.smtp.host&quot;, &quot;smtp.gmail.com&quot;);
 props.put(&quot;mail.smtp.port&quot;, &quot;587&quot;);

 btnSendEmail.setOnClickListener {
 Thread {
 try {
 sendEmail()
 // Your implementation
 } catch (ex: Exception) {
 ex.printStackTrace()
 }
 }.start()


 }
 }


 private fun sendEmail() {



 try {

 val session = Session.getInstance(props,
 object : javax.mail.Authenticator() {
 //Authenticating the password
 override fun getPasswordAuthentication(): javax.mail.PasswordAuthentication {
 return PasswordAuthentication(&quot;abc@xyz.com&quot;, &quot;password&quot;)
 }
 })

 val message = MimeMessage(session);
 message.setFrom(InternetAddress(&quot;abc@xyz.com&quot;));
 message.setRecipients(
 Message.RecipientType.TO,
 InternetAddress.parse(editCC.text.toString())
 )
 message.subject = editSubject.text.toString()
 message.setText(
 &quot;Dear Mail Crawler,&quot;
 + &quot;\n\n No spam to my email, please!&quot;
 );

 //val messageBodyPart = MimeBodyPart();

 //val multipart = MimeMultipart();

 //val file = &quot;path of file to be attached&quot;;

// val fileName = &quot;attachmentName&quot;
 // val source = FileDataSource(file);
 //messageBodyPart.setDataHandler(DataHandler(source));
 //messageBodyPart.setFileName(fileName);
 //multipart.addBodyPart(messageBodyPart);

 //message.setContent(multipart);

 Transport.send(message);
 System.out.println(&quot;Done&quot;);



 } catch (e: MessagingException) {
 throw RuntimeException(e);
 }

 }
}




 
</code></pre>

I am trying to create a mail sending application in Android. 

If I use: 

<pre><code>Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
</code></pre>

This will launch the built-in Android application; I'm trying to send the mail on button click directly without using this application.

Sending Email in Android using JavaMail API without using the default/built-in app

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Android

Kotlin

我正在尝试用Android创建一个邮件发送应用程序。如果我使用：Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);这将启动内置的Android应用程序；我正在尝试使用此应用程序在没有的情况下直接点击发送邮件。

问使用JavaMail接口在安卓系统中发送邮件，无需使用默认/内置应用
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