java - How to run main(String [] args) from another class (SendMail) -

i using sendmail allows me send email message.

if right click class , choose run 'sendmail().main', class compiles , correctly runs. sends me email.

how can run sendmail().main class?

what i've tried:

1. adding activity form sendmail, , tried initializing intent class.

code:

startactivity(new intent(anotherclass.this, sendmail.class)); 

2. tell anotherclass run void on sendmail.

anotherclass code:

public void loginas() { sendmail class2 = new sendmail(); class2.dosomething(); } 

sendmail code:

public static void dosomething() {     sendmail.main(new string[] {"main"}); } 

nothing seems work. sendmail class sends out

"oops has gone pearshaped!" 

and

07-20 16:32:29.507  11953-11953/blabla.bla i/system.out﹕ android.os.networkonmainthreadexception 

sendmail.java

import...  public class sendmail extends object {  public static void dosomething(string suser, string spass) { sendmail.main(new string[] {"main"}) }  public static void main(string [] args) {     (string s : args)         system.out.println(s);     try{         properties props = new properties();         props.put("mail.smtp.host", "smtp.gmail.com"); // gmail use smtp.gmail.com         props.put("mail.smtp.auth", "true");         props.put("mail.debug", "true");         props.put("mail.smtp.starttls.enable", "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");         session mailsession = session.getinstance(props, new javax.mail.authenticator() {             protected passwordauthentication getpasswordauthentication() {                 return new passwordauthentication("foo@gmail.com", "foo"); } });         mailsession.setdebug(true); // enable debug mode         message msg = new mimemessage( mailsession );         //--[ set from, to, date , subject fields         msg.setfrom( new internetaddress( "foo@gmail.com " ) );         msg.setrecipients( message.recipienttype.to,internetaddress.parse("1111111111@messaging.sprintpcs.com") );         msg.setsentdate( new date());         msg.setsubject( "hello world!" );         //--[ create body of mail         msg.settext( "hello first e-mail sent javamail" );         //--[ ask transport class send our mail message         transport.send( msg );     }catch(exception e){         system.out.println( "oops has gone pearshaped!");         system.out.println( e );         return;     } } } 

you're getting networkonmainthreadexception because you're attempting network operation in main ui thread.

in android network operations must executed in background thread.

one way use asynctask doinbackground() method, this:

public class sendmail extends object {      public void dosomething(string suser, string spass) {         new sendmailasync().execute(suser, spass);      }      class sendmailasync extends asynctask<string, void, void> {          @override         protected void doinbackground(string... params) {              string username = params[0];             string password = params[1]              (string s : args)                 system.out.println(s);             try{                 properties props = new properties();                 props.put("mail.smtp.host", "smtp.gmail.com"); // gmail use smtp.gmail.com                 props.put("mail.smtp.auth", "true");                 props.put("mail.debug", "true");                 props.put("mail.smtp.starttls.enable", "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");                 session mailsession = session.getinstance(props, new javax.mail.authenticator() {                     protected passwordauthentication getpasswordauthentication() {                         return new passwordauthentication("foo@gmail.com", "foo"); } });                 mailsession.setdebug(true); // enable debug mode                 message msg = new mimemessage( mailsession );                 //--[ set from, to, date , subject fields                 msg.setfrom( new internetaddress( "foo@gmail.com " ) );                 msg.setrecipients( message.recipienttype.to,internetaddress.parse("1111111111@messaging.sprintpcs.com") );                 msg.setsentdate( new date());                 msg.setsubject( "hello world!" );                 //--[ create body of mail                 msg.settext( "hello first e-mail sent javamail" );                 //--[ ask transport class send our mail message                 transport.send( msg );             }catch(exception e){                 system.out.println( "oops has gone pearshaped!");                 system.out.println( e );                 return null;             }              return null;         }     }  }  

when need call it, instantiate object first:

sendmail sendmail = new sendmail(); sendmail.dosomething(username, password);