在Android中使用JavaMail API发送电子邮件，而不使用默认/内置应用程序

我正在尝试在Android中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直接单击没有按钮发送邮件。

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小开

您可以使用JavaMail API来处理您的电子邮件任务。JavaMail API在JavaEE包中可用，其jar可供下载。遗憾的是，它不能直接在Android应用程序中使用，因为它使用了在Android中完全不兼容的AWT组件。

您可以在以下位置找到JavaMail的Android端口： http://code.google.com/p/javamail-android/

将jar添加到您的应用程序并使用SMTP方法

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SMTP

使用SMTP是一种方法，其他人已经指出了如何做到这一点。请注意，在执行此操作时，您完全绕过了内置的邮件应用程序，您必须提供SMTP服务器的地址、该服务器的用户名和密码，要么静态地在您的代码中提供，要么从用户处查询。

超文本传输协议

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参数并使用它们来发送邮件。这样，你只需要从设备发出HTTP请求（使用内置库很容易实现），不需要在设备上存储SMTP登录数据。与直接使用SMTP相比，这是一种间接的方式，但是因为从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。

邮件申请

如果邮件应该从用户已经在手机上注册的默认邮件帐户发送，你必须采取其他方法。如果你有足够的时间和经验，你可能想检查Android电子邮件应用程序的源代码，看看它是否提供了一些没有用户交互发送邮件的切入点（我不知道，但也许有一个）。

也许你甚至找到了一种方法来查询用户的帐户详细信息（所以你可以将它们用于SMTP），尽管我非常怀疑这是可能的，因为这将是一个巨大的安全风险，而且Android的构建相当安全。

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最佳答案

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

创建示例项目的步骤：

MailSenderActivity.java：

public class MailSenderActivity extends Activity {
    

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
        

final Button send = (Button) this.findViewById(R.id.send);
send.setOnClickListener(new View.OnClickListener() {
            

public void onClick(View v) {
try {
GMailSender sender = new GMailSender("username@gmail.com", "password");
sender.sendMail("This is Subject",
"This is Body",
"user@gmail.com",
"user@yahoo.com");
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
}
                

}
});
        

}
}

GMailSender.java：

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

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

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

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

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

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

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

}
}
  

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

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

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

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

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

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

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

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

JSSEProvider.java：

/*
*  Licensed to the Apache Software Foundation (ASF) under one or more
*  contributor license agreements.  See the NOTICE file distributed with
*  this work for additional information regarding copyright ownership.
*  The ASF licenses this file to You under the Apache License, Version 2.0
*  (the "License"); you may not use this file except in compliance with
*  the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
*  Unless required by applicable law or agreed to in writing, software
*  distributed under the License is distributed on an "AS IS" BASIS,
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*  See the License for the specific language governing permissions and
*  limitations under the License.
*/


/**
* @author Alexander Y. Kleymenov
* @version $Revision$
*/




import java.security.AccessController;
import java.security.Provider;


public final class JSSEProvider extends Provider {


public JSSEProvider() {
super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
AccessController.doPrivileged(new java.security.PrivilegedAction<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;
}
});
}
}

将以下链接中找到的3个罐子添加到您的Android项目

单击此处-如何添加外部罐子

别忘了在你的清单中添加这一行：

<uses-permission android:name="android.permission.INTERNET" />

只需单击下面的链接即可更改不太安全的应用程序的帐户访问权限 https://www.google.com/settings/security/lesssecureapps

运行项目并检查邮件的收件人邮件帐户。 干杯！

P. S.并且不要忘记您不能从Android中的任何活动进行网络操作。 因此，建议使用AsyncTask或IntentService来避免网络主线程异常。

罐子文件：https://code.google.com/archive/p/javamail-android/

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无法连接到SMTP主机： smtp.gmail.com，端口：465

在您的清单中添加此行：

<uses-permission android:name="android.permission.INTERNET" />
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感谢您提供的宝贵信息。代码运行正常。我还可以通过添加以下代码来添加附件。

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);
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这是一个alt版本，也适用于我，并有附件（上面已经发布，但完整的版本不同于源链接，人们发布他们无法让它工作，因为它缺少数据）

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++) {
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 …..
}

并在活动中称之为…

@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);
}
}
});
}
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为了帮助那些获得SDK目标>9的主线程上的网络异常的人。这使用了上面的droopie代码，但对任何对象都可以类似地工作。

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();


StrictMode.setThreadPolicy(policy);


android.os.NetworkOnMainThreadException

您可以像下面这样使用AsyncTranstion

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) + "failed");
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
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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/

小开 
 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++) {
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;
}




}
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发送带有附件的邮件…

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();}
}
}
小开

如果使用“smtp.gmail.com”作为默认smtp服务器，则发出警告。

谷歌会强迫您经常更改链接的电子邮件帐户密码，因为他们过于热情的“可疑活动”政策。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”。因为他们假设您（电子邮件帐户持有人）一次只能在一个国家。

当谷歌系统检测到“可疑活动”时，它将阻止进一步的电子邮件，直到您更改密码。由于您将密码硬编码到应用程序中，每次发生这种情况时您都必须重新发布应用程序，不理想。这种情况在一周内发生了3次，我甚至将密码存储在另一台服务器上，并在每次谷歌强迫我更改密码时动态获取密码。

因此，我建议使用许多免费的smtp提供程序之一而不是“smtp.gmail.com”来避免此安全问题。使用相同的代码，但将“smtp.gmail.com”更改为新的smtp转发主机。

小开

在没有用户干预的情况下，您可以发送如下：

  1. 从客户端apk发送电子邮件。这里mail.jar，发送java电子邮件需要activation.jar。如果添加这些jar，可能会增加APK大小。

  2. 或者，您可以在服务器端代码中使用Web服务，该服务将使用相同的mail.jar和activation.jar来发送电子邮件。您可以通过async任务调用Web服务并发送电子邮件。引用相同的链接。

（但是，您需要知道邮件帐户的凭据）

小开

如果要求您保持jar库尽可能小，您可以单独包含SMTP/POP3/IMAP函数，以避免“dex中的方法太多”问题。

您可以从javanet网页中选择所需的jar库，例如，mailapi.jar+imap.jar可以让您访问IMAP协议的iCloud，hotmail邮件服务器。

小开

那些正在获得ClassDefNotFoundError的人尝试将三个jar文件移动到项目的lib文件夹，它对我有用！！

小开

我尝试使用@Vinayak B提交的代码。但是我收到一个错误说：没有smtp的提供者

我为此创建了一个新问题，其中包含更多信息<强>这里

我终于能够自己修复它了。我不得不使用另一个mail.jar 我必须确保我的“访问不太安全的应用程序”已打开。

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。

小开

编辑：JavaMail 1.5.5声称支持Android，所以你不需要其他任何东西。

<罢工> 我已经将最新的JavaMail（1.5.4）移植到Android。它在Maven Central中可用，只需将以下内容添加到build.gradle~~

compile 'eu.ocathain.com.sun.mail:javax.mail:1.5.4'

然后您可以关注官方的教程。

源代码可在此处获得：https://bitbucket.org/artbristol/javamail-forked-android

小开

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：

1.使用此

2.应用异步任务。

3.更改发件人gmail帐户的安全问题。（更改为“打开”）这个

小开

使用演示的100%工作代码您还可以使用此答案发送多封电子邮件。

下载项目这里

步骤1：下载邮件、激活、额外的jar文件并在Android工作室中添加您的项目库文件夹。我添加了一个截图，见下文下载链接

libs add

使用gmail（使用您的邮件）和打开切换按钮LINK登录

大多数人都忘记了这一步，我希望你不会。

步骤2：完成此过程后。将此类复制并传递到您的项目中。

GMail.java

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: " + 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: " + emailMessage.getAllRecipients());
transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
transport.close();
Log.i("GMail", "Email sent successfully.");
}


}

SendMailTask.java

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();
}


}

第三步： 现在您可以根据需要更改此类，您也可以使用此类发送多封邮件。我提供xml和java文件。

activity_main.xml

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


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


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


<EditText
android:id="@+id/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="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="Subject" />


<EditText
android:id="@+id/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="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="Body" />


<EditText
android:id="@+id/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="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send Email" />


</LinearLayout>

SendMailActivity.java

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: " + 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);
}
});
}
}

说明不要忘记在AndroidManifest.xml文件中添加互联网权限

<uses-permission android:name="android.permission.INTERNET"/>

希望它能起作用，如果不是，请在下面评论。

小开

其他答案中提供的所有代码都是正确的，并且运行良好，但有点混乱，所以我决定发布一个库（仍在开发中）以更简单的方式使用它：安卓邮箱。

您只需创建一个MailSender，构建一个邮件并将其发送（已经在后台使用Async任务处理）。

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);

您可以收到发送的电子邮件通知，它还支持不同的收件人类型（TO、CC和BCC）、附件和html：

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 :(
}
});

您可以通过Gradle或Maven获取：

compile 'it.enricocandino:androidmail:1.0.0-SNAPSHOT'

请让我知道，如果你有任何问题！：）

小开

要添加附件，不要忘记添加。 

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);
小开

Gmail后台是一个小型库，无需用户交互即可在后台发送电子邮件：

用法：

    BackgroundMail.newBuilder(this)
.withUsername("username@gmail.com")
.withPassword("password12345")
.withMailto("toemail@gmail.com")
.withType(BackgroundMail.TYPE_PLAIN)
.withSubject("this is the subject")
.withBody("this is the body")
.withOnSuccessCallback(new BackgroundMail.OnSuccessCallback() {
@Override
public void onSuccess() {
//do some magic
}
})
.withOnFailCallback(new BackgroundMail.OnFailCallback() {
@Override
public void onFail() {
//do some magic
}
})
.send();

配置：

repositories {
// ...
maven { url "https://jitpack.io" }
}
dependencies {
compile 'com.github.yesidlazaro:GmailBackground:1.2.0'
}

权限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>

同样对于附件，您需要设置READ_EXTERNAL_STORAGE权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

来源

（我自己测试过）

小开

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：

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);
}
}
}

图片来源：通过JavaMail API发送电子邮件

希望有帮助！祝你好运！

小开

使用静态编程语言以编程方式发送电子邮件。

  • 简单的电子邮件发送，而不是所有其他功能（如附件）。
  • TLS一直开着
  • 只需要1个gradle电子邮件依赖项。

我还发现这个电子邮件POP服务列表非常有用：

https://support.office.com/en-gb/article/pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353

如何使用：

    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)
}

代码：

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"
}
}

Gradle：

dependencies {
implementation 'com.sun.mail:android-mail:1.6.4'
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3"
}

Android清单：

<uses-permission android:name="android.permission.INTERNET" />
小开

这里有很多解决方案。但是我认为我们必须更改GMail的配置，以允许从不太安全的设备访问。转到下面的链接并启用它。它对我有用

https://myaccount.google.com/lesssecureapps?pli=1

小开

对于那些希望在2020年将JavaMail与静态编程语言一起使用的人：

首先：将这些依赖项添加到您的build.gradle文件（官方JavaMail Maven依赖项）

实现'com.sun.mail： android-mail： 1.6.5'

实现'com.sun.mail： android-激活： 1.6.5'

实现"org.bouncycastle： bcmail-jdk15on： 1.65"

实现"org.jetbrains.kotlinx： kotlinx-coroutines-core： 1.3.7"

实现"org.jetbrains.kotlinx： kotlinx-coroutines-android： 1.3.7"

BouncyCastle是出于安全原因。

第二：将这些权限添加到您的AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

第三：使用SMTP时，创建一个配置文件

object Config {
const val EMAIL_FROM = "You_Sender_Email@email.com"
const val PASS_FROM = "Your_Sender_Password"


const val EMAIL_TO = "Your_Destination_Email@email.com"
}

第四：创建你的Mailer对象

object Mailer {


init {
Security.addProvider(BouncyCastleProvider())
}


private fun props(): Properties = Properties().also {
// Smtp server
it["mail.smtp.host"] = "smtp.gmail.com"
// Change when necessary
it["mail.smtp.auth"] = "true"
it["mail.smtp.port"] = "465"
// Easy and fast way to enable ssl in JavaMail
it["mail.smtp.ssl.enable"] = true
}


// Dont ever use "getDefaultInstance" like other examples do!
private fun session(emailFrom: String, emailPass: String): Session = Session.getInstance(props(), object : Authenticator() {
override fun getPasswordAuthentication(): PasswordAuthentication {
return PasswordAuthentication(emailFrom, emailPass)
}
})


private fun builtMessage(firstName: String, surName: String): String {
return """
<b>Name:</b> $firstName  <br/>
<b>Surname:</b> $surName <br/>
""".trimIndent()
}


private fun builtSubject(issue: String, firstName: String, surName: String):String {
return """
$issue | $firstName, $surName
""".trimIndent()
}


private fun sendMessageTo(emailFrom: String, session: Session, message: String, subject: String) {
try {
MimeMessage(session).let { mime ->
mime.setFrom(InternetAddress(emailFrom))
// Adding receiver
mime.addRecipient(Message.RecipientType.TO, InternetAddress(Config.EMAIL_TO))
// Adding subject
mime.subject = subject
// Adding message
mime.setText(message)
// Set Content of Message to Html if needed
mime.setContent(message, "text/html")
// send mail
Transport.send(mime)
}


} catch (e: MessagingException) {
Log.e("","") // Or use timber, it really doesn't matter
}
}


fun sendMail(firstName: String, surName: String) {
// Open a session
val session = session(Config.EMAIL_FROM, Config.PASSWORD_FROM)


// Create a message
val message = builtMessage(firstName, surName)


// Create subject
val subject = builtSubject(firstName, surName)


// Send Email
CoroutineScope(Dispatchers.IO).launch { sendMessageTo(Config.EMAIL_FROM, session, message, subject) }
}

说明

  • 如果您想要更安全的方式发送电子邮件（并且您想要更安全的方式！），请使用前面解决方案中提到的超文本传输协议（我可能会在稍后的回答中添加它）
  • 您必须正确检查用户手机是否可以访问互联网，否则应用程序将崩溃。
  • 使用gmail时，启用“不太安全的应用程序”（当您的gmail启用了两个因素时，这将不起作用）https://myaccount.google.com/lesssecureapps?pli=1
  • 一些学分属于：https://medium.com/@chetan.garg（他使用RxJava作为他的解决方案）
小开 
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,"
+ "\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);
}


}
}

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