Question

我正在使用SendMail，它允许我发送电子邮件。

如果我右键单击该课程并选择运行＆＃39; SendMail（）。main＆＃39; ，则该课程将编译并正确运行。它给我发了一封电子邮件。

如何从另一个类运行SendMail（）。main？

我尝试过的事情：

将活动表单添加到SendMail，并尝试使用另一个类的intent初始化。

代码：

startActivity(new Intent(anotherClass.this, SendMail.class));

告诉anotherClass在SendMail上运行void。

anotherClass Code：

public void loginAs()
{
SendMail class2 = new SendMail();
class2.doSomething();
}

SendMail代码：

public static void doSomething() {
    SendMail.main(new String[] {"main"});
}

似乎没什么用。我的SendMail类发出

"Oops something has gone pearshaped!"

和

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)
{
    for (String s : args)
        System.out.println(s);
    try{
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com"); // for 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 the debug mode
        Message msg = new MimeMessage( mailSession );
        //--[ Set the FROM, TO, DATE and 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 the body of the mail
        msg.setText( "Hello from my first e-mail sent with JavaMail" );
        //--[ Ask the Transport class to send our mail message
        Transport.send( msg );
    }catch(Exception E){
        System.out.println( "Oops something has gone pearshaped!");
        System.out.println( E );
        return;
    }
}
}

Answer 1

您正在获取NetworkOnMainThreadException，因为您正尝试在主UI线程中执行网络操作。

在Android中，所有网络操作都必须在后台线程中执行。

一种方法是使用只有doInBackground()方法的AsyncTask，如下所示：

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]

            for (String s : args)
                System.out.println(s);
            try{
                Properties props = new Properties();
                props.put("mail.smtp.host", "smtp.gmail.com"); // for 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 the debug mode
                Message msg = new MimeMessage( mailSession );
                //--[ Set the FROM, TO, DATE and 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 the body of the mail
                msg.setText( "Hello from my first e-mail sent with JavaMail" );
                //--[ Ask the Transport class to send our mail message
                Transport.send( msg );
            }catch(Exception E){
                System.out.println( "Oops something has gone pearshaped!");
                System.out.println( E );
                return null;
            }

            return null;
        }
    }

}

当你需要调用它时，首先实例化一个对象：

SendMail sendMail = new SendMail();
sendMail.doSomething(username, password);

Answer 2

  String[] yourArgumentsForSendMailMain = new String[] {"argument"};
  SendMail.main(yourArgumentsForSendMailMain);

应该有效。如果没有，你能告诉我导致异常的是什么行吗？（即：使用调试器逐步执行try块，直到找到问题行）

Answer 3

为什么不从主方法中获取整个代码并将其放入非静态运行方法中？

void run(String[] args) {
    YOUR CODE HERE
}

当你在另一个类中使用此方法时，如

SendMail sm = new SendMail();
sm.run(new String[] {"xyz"});

你甚至可以在另一个类中使用非私人属性......

如何从另一个类（SendMail）运行main（String [] args）

3 个答案: