java.lang.IllegalStateException：无法执行活动的方法（尝试发送邮件）答案

【问题标题】：java.lang.IllegalStateException: Could not execute method of the activity (trying to send a mail)java.lang.IllegalStateException：无法执行活动的方法（尝试发送邮件）
【发布时间】：2013-09-14 23:22:56
【问题描述】：

我正在尝试使用找到的代码here

从 Android 应用发送电子邮件。

我正在使用 ADT Build 22.0.5

我见过很多人有这个问题，但出于不同的原因，我真的无法理解它。

这是完整的错误日志

09-14 15:53:49.001: E/AndroidRuntime(4611): FATAL EXCEPTION: main
09-14 15:53:49.001: E/AndroidRuntime(4611): java.lang.IllegalStateException: Could not         execute method of the activity
09-14 15:53:49.001: E/AndroidRuntime(4611):     at    android.view.View$1.onClick(View.java:3599)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.view.View.performClick(View.java:4204)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.view.View$PerformClick.run(View.java:17355)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.os.Handler.handleCallback(Handler.java:725)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.os.Handler.dispatchMessage(Handler.java:92)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.os.Looper.loop(Looper.java:137)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.app.ActivityThread.main(ActivityThread.java:5041)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at java.lang.reflect.Method.invokeNative(Native Method)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at java.lang.reflect.Method.invoke(Method.java:511)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at dalvik.system.NativeStart.main(Native Method)
09-14 15:53:49.001: E/AndroidRuntime(4611): Caused by: java.lang.reflect.InvocationTargetException
09-14 15:53:49.001: E/AndroidRuntime(4611):     at java.lang.reflect.Method.invokeNative(Native Method)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at java.lang.reflect.Method.invoke(Method.java:511)
09-14 15:53:49.001: E/AndroidRuntime(4611):     at android.view.View$1.onClick(View.java:3594)
09-14 15:53:49.001: E/AndroidRuntime(4611):     ... 11 more
09-14 15:53:49.001: E/AndroidRuntime(4611): Caused by: java.lang.NoClassDefFoundError: com.example.naghe.Mail
09-14 15:53:49.001: E/AndroidRuntime(4611):     at com.example.naghe.NagheMainActivity.sendMessage(NagheMainActivity.java:21)

这是我的主要活动

package com.example.naghe;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class NagheMainActivity extends Activity {


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_naghe_main);

        }
    public void sendMessage (View view) {
        Mail m = new Mail("test", "test");
        String[] toArr = {"mail}; 
        m.setTo(toArr); 
        m.setFrom("wooo@wooo.com"); 
        m.setSubject("This is an email sent using my Mail JavaMail wrapper from an Android device."); 
        m.setBody("Email body."); 

        try { 
          m.addAttachment("/sdcard/filelocation"); 

          if(m.send()) { 
            Toast.makeText(NagheMainActivity.this, "Email was sent successfully.", Toast.LENGTH_LONG).show(); 
          } else { 
            Toast.makeText(NagheMainActivity.this, "Email was not sent.", Toast.LENGTH_LONG).show(); 
          } 
        } catch(Exception e) { 
          //Toast.makeText(MailApp.this, "There was a problem sending the email.", Toast.LENGTH_LONG).show(); 
          Log.e("MailApp", "Could not send email", e); 
        } 
    }
}

这是 XML，它只是一个按钮，因为我正在测试它

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".NagheMainActivity" >

    <Button
        android:id="@+id/send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="84dp"
        android:onClick="sendMessage"
        android:text="Button" />

</RelativeLayout>

是的，我的项目中有 Mail 类。您可以在这篇文章的第一个链接上找到该课程，但这里是

Mail.java

package com.example.naghe;

import java.util.Date; 
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[] _to; 
  private String _from; 

  private String _port; 
  private String _sport; 

  private String _host; 

  private String _subject; 
  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 

    _user = ""; // username 
    _pass = ""; // password 
    _from = ""; // email sent from 
    _subject = ""; // email subject 
    _body = ""; // email body 

    _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; 
  } 

  public void setTo(String[] _to) { 
        this._to = _to; 
      } 

  public void setFrom(String _from){
      this._from = _from;
  }

  public void setSubject(String _subject){
      this._subject = _subject;
  }
  // more of the getters and setters ….. 
}

非常感谢任何帮助！

【问题讨论】：

引起：java.lang.NoClassDefFoundError：com.example.naghe.Mail。你的应用中有邮件类吗？
使用你给它的链接中的代码在我们开始之前，你需要通过下面的链接下载一些文件 - 这是 JavaMail API 的一个特殊版本，它是编写的专门针对安卓。看起来您没有将 jars 正确添加到您的项目库文件夹 code.google.com/p/javamail-android/downloads/list
谢谢 Raghunandan 我已经下载了，Javax.mail-1.5.0.jar、activation.jar、additional.jar 和 mail.jar 已经在我的构建池中
java mail 1.5 不能在 android 上运行，它会给出 NoClassDefFoundError 因为它依赖于一些未在 android 中实现的类（主要是 swing 类，还有 javax.security.auth.callback 和 javax 中的一些类.security.sasl）。您只需要使用 java mail for android 项目中的 jars。如果您将 smtp 的 debug 设置为 true，您应该会看到它找不到哪些类
谢谢@alex 我从构建路径中删除了 java mail 1.5，清理了项目，但我一直收到同样的错误。我今晚会尝试调试它并查找丢失/错误的类

标签： java android eclipse jakarta-mail

【解决方案1】：

它是由

引起的

09-14 15:53:49.001: E/AndroidRuntime(4611): Caused by: java.lang.reflect.InvocationTargetException

表示您在 XML 中指的是实际上不存在（或存在于其他地方）的资源

请交叉检查您从 java 中引用的 xml 小部件，或者您也可以发布 XML 文件（我会看看）。

还有

Caused by: java.lang.NoClassDefFoundError: com.example.naghe.Mail

还要检查你的包中是否包含Mail 类。

【讨论】：