Java邮件API在android中不起作用

Question

我将三个jar文件添加到java构建路径，添加Internet使用权限都设置好了！我在我的主页上放了一个按钮，每当我点击这个按钮时，这个 java 邮件类的意图就可以工作，并且电子邮件必须发送给相应的用户。但是当我单击按钮时，它突然显示应用程序停止工作..！！一件事是我没有为这个java邮件类使用任何布局。当您看到下面的代码时，您就会明白。它导致我想自动发送消息。！该怎么办。？？帮帮我。??谢谢你。！！

package;


import java.util.Date; 
import android.content.Intent;
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 to1,to2,to3,to4,to5; // here i putted my recepients name
  private String[] _to = {to1,to2,to3,to4,to5}; 
  private String _from; 

  private String _port; 
  private String _sport; 

  private String _host; 

  private String _subject = "HELLO";
  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 



    _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.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); 
  } 

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() { 
    return _body; 
  } 

  public void setBody(String _body) { 
    this._body = _body; 
  } 

  // more of the getters and setters ….. 
} 

Answer 1

您应该发布调用此类的代码（可能是您的Activity）。有一些常见问题可能导致此问题，例如NetworkOnMainThreadException。

我基于相同的javax.mail 代码编写了一些有效的Android 邮件代码，并且它可以正常工作。代码如下：

    submitButton.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v) {

            /*
             * Send email in a background thread
             */
            Thread t = new Thread(new Runnable() {
                @Override
                public void run() {

                    // retrieve the configuration values from preferences
                    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(theActivity);
                    String destinationAddress = preferences.getString("email_destination_address", theActivity.getString(R.string.default_email_destination_address));
                    String senderAddress = preferences.getString("email_from", theActivity.getString(R.string.default_email_sender_address));
                    String senderPassword = preferences.getString("email_password", theActivity.getString(R.string.default_email_sender_password));
                    String smtpServer = preferences.getString("email_server", theActivity.getString(R.string.default_smtp_server));

                    Mail m = new Mail(senderAddress, senderPassword);

                    String[] toArr = { destinationAddress };
                    m.setHost(smtpServer);
                    m.setTo(toArr);
                    m.setFrom(EMAIL_USERNAME);
                    m.setSubject(getString(R.string.email_subject, barcode));
                    m.setBody(getString(R.string.email_body));

                    try {
                        ArrayList<String> filesToSend = theAdapter.getFilenames();

                        for (String file : filesToSend)
                        {
                            m.addAttachment(file);
                        }

                        if (m.send()) {
                            Log.d(TAG, "EMAIL SENT SUCCESSFULLY");
                        } else {
                            Log.w(TAG, "EMAIL NOT SENT");
                        }
                    } catch (Exception e) {
                        Log.e(TAG, "Could not send email", e);
                    }

                }
            });
            t.start();
            Toast.makeText(getApplicationContext(), getString(R.string.email_sending), Toast.LENGTH_LONG).show();

            theActivity.onBackPressed();
        }
    });

注意：如果我今天编写此代码，我可能会使用AsyncTask 而不是线程，但两者都被认为是有效的。

Answer 2

您缺少 getter 和 setter 的其余代码。请参阅代码底部的注释：

// more of the getters and setters …..

您需要添加以下内容来代替该评论：

/**
 * METHOD TO SET THE "TO" STRING ARRAY
 * @param toArr
 */
public void setTo(String[] toArr) {
    this._to = toArr;
}

/**
 * METHOD TO GET THE "TO" STRING ARRAY
 * @return
 */
public String[] getTo() {
    return _to;
} 

/**
 * METHOD TO SET THE "FROM" FIELD FOR THE MESSAGE
 * @param string
 */
public void setFrom(String string) {
    this._from = string;
}

/**
 * METHOD TO GET THE "FROM" FIELD FOR THE MESSAGE
 * @return
 */
public String getFrom() {
    return _from;
} 

/**
 * METHOD TO SET THE MESSAGE SUBJECT
 * @param string
 */
public void setSubject(String string) {
    this._subject = string;
} 

/**
 * METHOD TO GET THE MESSAGE SUBJECT
 * @return
 */
public String getSubject() {
    return _subject;
} 

这应该可以。您将面临的下一个障碍将是 DShaw 在下面提到的有关 NetworkOnMainThreadException 的内容，可以通过使用此 post 来修复它而不检查 StrictMode，但更好的选择是使用 AsyncTask，如 @987654324 中所述@帖子。

[编辑] 我也遇到了 proguard 的问题！如果以上方法都不起作用，请尝试禁用 proguard 以查看它是否起作用。

希望这会有所帮助。