Android background does not send Email with Intent

The following is an encapsulation of the mail sending function. using these methods, you can easily send emails or even add attachments.
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 [] _;
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. getdefacommandcommandmap ();
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. setdefacommandcommandmap (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 (){
}

Public void setBody (String _ body ){
This. _ body = _ body;
}

// More of the getters and setters .....
}

 

And now I'm going to go through each bit of code

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. getdefacommandcommandmap ();
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. setdefacommandcommandmap (mc );
}

Public Mail (String user, String pass ){
This ();

_ User = user;
_ Pass = pass;
}
In this Code, we initialized the mail-like attribute and set it to the default value.
Note the JavaMail MIME type. There is a description.
Take a closer look at the two constructors. You can use one of them to pass in the username and password.
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;
}
}
This is the sending method. The data attribute is set and the sending operation is executed.

 

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 );
}
This is the function for adding attachments, but it must be called before sending.

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;
}
Here, we set the mail authentication Attribute-SMTP authentication by default.
This is a connection to all Gmail (Google) SMTP servers.