Question

我有一个发送电子邮件的Android应用程序。但是当我想发送电子邮件时，我的程序完全崩溃了，我收到了错误：

处理：com.example.jonas.shoppinglist，PID：16791 java.lang.RuntimeException：执行doInBackground（）时发生错误在android.os.AsyncTask $ 3.done（AsyncTask.java:300）在java.util.concurrent.FutureTask.finishCompletion（FutureTask.java:355） at java.util.concurrent.FutureTask.setException（FutureTask.java:222）在java.util.concurrent.FutureTask.run（FutureTask.java:242）在android.os.AsyncTask $ SerialExecutor $ 1.run（AsyncTask.java:231） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1112） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:587）在java.lang.Thread.run（Thread.java:818）引起：java.lang.NoClassDefFoundError：javax.activation.DataHandler 在javax.mail.internet.MimeMessage.setContent（MimeMessage.java:1508）在javax.mail.internet.MimeBodyPart.setText（MimeBodyPart.java:1155）在javax.mail.internet.MimeMessage.setText（MimeMessage.java:1547）在javax.mail.internet.MimeMessage.setText（MimeMessage.java:1531）

现在我显示电子邮件发件人的代码，问题行是message.setText（“实际文本”）;

import android.util.Log;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.activation.*;

public class MailSender {

    private String body;

    public void send() {
        // Recipient's email ID needs to be mentioned.
        String to = "abcd@gmail.com";

        // Sender's email ID needs to be mentioned
        String from = "web@gmail.com";

        // Assuming you are sending email from localhost
        String host = "localhost";

        // Get system properties
        Properties properties = System.getProperties();

        // Setup mail server
        properties.setProperty("mail.smtp.host", host);

        // Get the default Session object.
        Session session = Session.getDefaultInstance(properties);

        try {
            // Create a default MimeMessage object.
            MimeMessage message = new MimeMessage(session);

            // Set From: header field of the header.
            message.setFrom(new InternetAddress(from));

            // Set To: header field of the header.
            message.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(to));

            // Set Subject: header field
            message.setSubject("This is the Subject Line!");

            // Now set the actual message
            message.setText("This is actual message");

            // Send message
            Transport.send(message);
        } catch (AddressException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}

我已经做了一些研究，人们说这是一个问题，但我认为我都需要依赖。这是我的依赖关系：

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.2.1'
    compile 'com.google.android.gms:play-services-gcm:7.3.0'
    compile 'javax.activation:activation:1.1'
    compile 'javax.mail:mail:1.5.0-b01'
    compile 'javax.activation:activation:1.1.1'
}

出了什么问题？

Answer 1

您正在使用可能不适合Android的Java库（javax.mail：mail：1.5.0-b01）。有一个Android版本的javamail： https://code.google.com/p/javamail-android/你应该尝试一下。不要指望每个使用Java的库都可以在Android上运行。

当我想在我的应用

1 个答案: