Send E-mail In Android Without User Interacton

I would like to send an e-mail in my app using whatever default mail provider the user already has setup. It must be possible to send the e-mail without requiring any user interact

Solution 1:

After some more digging around, I think there is a solution. Google has now added support for Gmail authentication using OAuth 2.0 which avoids the need to access the user's username and password. Since my app will require the user to have a Gmail account, this might be the solution. Of course this won't work for any other e-mail provider that doesn't support OAuth but since Google is concerned about protecting username/passwords, this approach seems to be right. Need to look into how to use OAuth from within my app, but theoretically it should be possible. Once a user grants permission to a Google service, the app receives a token that is used for the lifetime that the permission remains. The question that is still unresolved is whether Gmail supports sending an e-mail using OAuth:

Google Brings OAuth 2.0 Support To Gmail And Google Talk To Make Third-Party Apps More Secure

OAuth2 Support for Gmail

Google's sample code for Gmail support and OAuth2

Android app demonstrating how to send e-mail using OAuth

YouTube video showing how a mobile app uses 2 step verification in an app

Android docs on using OAuth 2.0

Code sample to send e-mail using OAuth2

Solution 2:

Try this code...

publicclassSendAttachment{
                        publicstaticvoidmain(String [] args){ 
                 //to address
                        String to="abc@abc.com";//change accordingly//from addressfinal String user="efg@efg.com";//change accordinglyfinal String password="password";//change accordingly MailcapCommandMapmc= (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   Propertiesproperties= 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");

                      Sessionsession= Session.getDefaultInstance(properties,
                       newjavax.mail.Authenticator() {
                       protected PasswordAuthentication getPasswordAuthentication() {
                       returnnewPasswordAuthentication(user,password);
                       }
                      });

                      //2) compose message   try{ 
                        MimeMessagemessage=newMimeMessage(session);
                        message.setFrom(newInternetAddress(user));
                        message.addRecipient(Message.RecipientType.TO,newInternetAddress(to));
                        message.setSubject("Hii"); 
                        //3) create MimeBodyPart object and set your message content    BodyPartmessageBodyPart1=newMimeBodyPart();
                        messageBodyPart1.setText("How is This"); 
                        //4) create new MimeBodyPart object and set DataHandler object to this object    MimeBodyPartmessageBodyPart2=newMimeBodyPart();
                    //Location of file to be attachedStringfilename= Environment.getExternalStorageDirectory().getPath()+"/R2832.zip";//change accordinglyDataSourcesource=newFileDataSource(filename);
                        messageBodyPart2.setDataHandler(newDataHandler(source));
                        messageBodyPart2.setFileName("Hello"); 
                        //5) create Multipart object and add MimeBodyPart objects to this object    Multipartmultipart=newMimeMultipart();
                        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();}
                      }
                    }