使用SMTP在没有意图的情况下在android中发送邮件

概述嗨,我正在开发一个Android应用程序,将点击一个按钮发送邮件.代码起初工作但由于某种原因它现在不起作用.有人可以帮我这个吗？xyz@outlook.com是收件人.abc@gmail.com是发件人.我已经对主题和邮件正文进行了硬编码.packagecom.example.clc_construction;importjava.io.File;im

嗨,我正在开发一个Android应用程序,将点击一个按钮发送邮件.代码起初工作但由于某种原因它现在不起作用.有人可以帮我这个吗？
xyz@outlook.com是收件人.
abc@gmail.com是发件人.
我已经对主题和邮件正文进行了硬编码.

package com.example.clc_construction;import java.io.file;import java.io.UnsupportedEnCodingException;import java.util.PropertIEs;import javax.activation.DataHandler;import javax.activation.DataSource;import javax.activation.fileDataSource;import javax.mail.Message;import javax.mail.MessagingException;import javax.mail.Multipart;import javax.mail.PasswordAuthentication;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeBodyPart;import javax.mail.internet.MimeMessage;import javax.mail.internet.MimeMultipart;import androID.app.Activity;import androID.app.ProgressDialog;  import androID.content.Intent;import androID.graphics.Bitmap;import androID.os.AsyncTask;import androID.os.Bundle;import androID.os.Environment;public class Email extends Activity{public String jobNo;public String teamNo;private static final String username = "abc@gmail.com";private static final String password = "000000";private static final String emailID = "xyz@outlook.com";private static final String subject = "Photo";private static final String message = "Hello";private Multipart multipart = new MimeMultipart();private MimeBodyPart messageBodyPart = new MimeBodyPart();public file mediafile;@OverrIDeprotected voID onCreate(Bundle savedInstanceState){    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.camera_screen);    Intent intent = getIntent();    jobNo = intent.getStringExtra("Job_No");    teamNo = intent.getStringExtra("Team_No");     sendMail(emailID,subject,message);}private voID sendMail(String email, String subject, String messageBody) {        Session session = createSessionObject();        try {            Message message = createMessage(email, subject, messageBody, session);            new SendMailTask().execute(message);        }        catch (AddressException e)        {            e.printstacktrace();        }        catch (MessagingException e)        {            e.printstacktrace();        }        catch (UnsupportedEnCodingException e)        {            e.printstacktrace();        }    }private Session createSessionObject(){    PropertIEs propertIEs = new PropertIEs();    propertIEs.put("mail.smtp.auth", "true");    propertIEs.put("mail.smtp.starttls.enable", "true");    propertIEs.put("mail.smtp.host", "smtp.gmail.com");    propertIEs.put("mail.smtp.port", "587");    return Session.getInstance(propertIEs, new javax.mail.Authenticator()    {        protected PasswordAuthentication getpasswordAuthentication()        {            return new PasswordAuthentication(username, password);        }    });}private Message createMessage(String email, String subject, String messageBody, Session session) throws MessagingException, UnsupportedEnCodingException{    Message message = new MimeMessage(session);    message.setFrom(new InternetAddress("xzy@outlook.com", "Naveed Qureshi"));    message.addRecipIEnt(Message.RecipIEntType.TO, new InternetAddress(email, email));    message.setSubject(subject);    message.setText(messageBody);    return message;}public class SendMailTask extends AsyncTask<Message, VoID, VoID>{    private ProgressDialog progressDialog;    @OverrIDe    protected voID onPreExecute()    {        super.onPreExecute();        progressDialog = ProgressDialog.show(Email.this, "Please wait", "Sending mail", true, false);    }    @OverrIDe    protected voID onPostExecute(VoID aVoID)    {        super.onPostExecute(aVoID);        progressDialog.dismiss();    }    protected VoID doInBackground(javax.mail.Message... messages)    {        try        {            Transport.send(messages[0]);        } catch (MessagingException e)        {            e.printstacktrace();        }        return null;    }}}

解决方法:

放入你的清单文件,

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

检查你是否有互联网连接,

public boolean isOnline() {    ConnectivityManager cm =        (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);    NetworkInfo netInfo = cm.getActiveNetworkInfo();    if (netInfo != null && netInfo.isConnectedOrConnecting()) {        return true;    }    return false;}

并最终使用此代码发送电子邮件

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!");        MimeBodyPart messageBodyPart = new MimeBodyPart();        Multipart multipart = new MimeMultipart();        messageBodyPart = new MimeBodyPart();        String file = "path of file to be attached";        String filename = "attachmentname"        DataSource source = new fileDataSource(file);        messageBodyPart.setDataHandler(new DataHandler(source));        messageBodyPart.setfilename(filename);        multipart.addBodyPart(messageBodyPart);        message.setContent(multipart);        Transport.send(message);        System.out.println("Done");    } catch (MessagingException e) {        throw new RuntimeException(e);    }

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