[英]Sending Email in Android using JavaMail API without using the default/built-in app
我正在尝试在 Android 中创建一个邮件发送应用程序。
如果我使用：
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
这将启动内置的 Android 应用程序； 我试图在不使用此应用程序的情况下直接单击按钮发送邮件。
在 Android 中使用 JavaMail API 使用 Gmail 身份验证发送电子邮件。
MailSenderActivity.java：
public class MailSenderActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Button send = (Button) this.findViewById(R.id.send);
send.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
GMailSender sender = new GMailSender("username@gmail.com", "password");
sender.sendMail("This is Subject",
"This is Body",
"user@gmail.com",
"user@yahoo.com");
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
}
}
});
}
}
GMailSender.java：
public class GMailSender extends javax.mail.Authenticator {
private String mailhost = "smtp.gmail.com";
private String user;
private String password;
private Session session;
static {
Security.addProvider(new com.provider.JSSEProvider());
}
public GMailSender(String user, String password) {
this.user = user;
this.password = password;
Properties props = new Properties();
props.setProperty("mail.transport.protocol", "smtp");
props.setProperty("mail.host", mailhost);
props.put("mail.smtp.auth", "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");
props.setProperty("mail.smtp.quitwait", "false");
session = Session.getDefaultInstance(props, this);
}
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, password);
}
public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {
try{
MimeMessage message = new MimeMessage(session);
DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
message.setSender(new InternetAddress(sender));
message.setSubject(subject);
message.setDataHandler(handler);
if (recipients.indexOf(',') > 0)
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
else
message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
Transport.send(message);
}catch(Exception e){
}
}
public class ByteArrayDataSource implements DataSource {
private byte[] data;
private String type;
public ByteArrayDataSource(byte[] data, String type) {
super();
this.data = data;
this.type = type;
}
public ByteArrayDataSource(byte[] data) {
super();
this.data = data;
}
public void setType(String type) {
this.type = type;
}
public String getContentType() {
if (type == null)
return "application/octet-stream";
else
return type;
}
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(data);
}
public String getName() {
return "ByteArrayDataSource";
}
public OutputStream getOutputStream() throws IOException {
throw new IOException("Not Supported");
}
}
}
JSSEProvider.java：
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Alexander Y. Kleymenov
* @version $Revision$
*/
import java.security.AccessController;
import java.security.Provider;
public final class JSSEProvider extends Provider {
public JSSEProvider() {
super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
AccessController.doPrivileged(new java.security.PrivilegedAction<Void>() {
public Void run() {
put("SSLContext.TLS",
"org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
put("Alg.Alias.SSLContext.TLSv1", "TLS");
put("KeyManagerFactory.X509",
"org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
put("TrustManagerFactory.X509",
"org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
return null;
}
});
}
}
将以下链接中的 3 个 jar 添加到您的 Android 项目
并且不要忘记在清单中添加这一行：
<uses-permission android:name="android.permission.INTERNET" />
只需单击以下链接即可更改安全性较低的应用程序的帐户访问权限https://www.google.com/settings/security/lesssecureapps
运行该项目并检查邮件的收件人邮件帐户。 干杯！
PS 并且不要忘记，您不能从 android 中的任何 Activity 进行网络操作。 因此建议使用AsyncTask或IntentService来避免主线程异常的网络。
Jar 文件： https : //code.google.com/archive/p/javamail-android/
感谢您提供宝贵的信息。 代码工作正常。 我也可以通过添加以下代码来添加附件。
private Multipart _multipart;
_multipart = new MimeMultipart();
public void addAttachment(String filename,String subject) throws Exception {
BodyPart messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
_multipart.addBodyPart(messageBodyPart);
BodyPart messageBodyPart2 = new MimeBodyPart();
messageBodyPart2.setText(subject);
_multipart.addBodyPart(messageBodyPart2);
}
message.setContent(_multipart);
无法连接到 SMTP 主机：smtp.gmail.com，端口：465
在您的清单中添加这一行：
<uses-permission android:name="android.permission.INTERNET" />
您可以使用 JavaMail API 来处理您的电子邮件任务。 JavaMail API 在 JavaEE 包中可用，其 jar 可供下载。 遗憾的是，它不能直接在 Android 应用程序中使用，因为它使用了在 Android 中完全不兼容的 AWT 组件。
您可以在以下位置找到 JavaMail 的 Android 端口： http : //code.google.com/p/javamail-android/
将 jars 添加到您的应用程序并使用 SMTP 方法
带有演示的 100% 工作代码您还可以使用此答案发送多封电子邮件。
在这里下载项目
第 1 步：下载邮件、激活、其他 jar 文件并添加到 android studio 中的项目 libs 文件夹中。 我添加了一个截图，见下面的下载链接
使用 gmail 登录（使用您的来自邮件）并打开切换按钮链接
大多数人忘记了这一步，我希望你不会。
第 2 步：完成此过程后。 将此类复制并粘贴到您的项目中。
GMail.java
import android.util.Log;
import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class GMail {
final String emailPort = "587";// gmail's smtp port
final String smtpAuth = "true";
final String starttls = "true";
final String emailHost = "smtp.gmail.com";
String fromEmail;
String fromPassword;
List<String> toEmailList;
String emailSubject;
String emailBody;
Properties emailProperties;
Session mailSession;
MimeMessage emailMessage;
public GMail() {
}
public GMail(String fromEmail, String fromPassword,
List<String> toEmailList, String emailSubject, String emailBody) {
this.fromEmail = fromEmail;
this.fromPassword = fromPassword;
this.toEmailList = toEmailList;
this.emailSubject = emailSubject;
this.emailBody = emailBody;
emailProperties = System.getProperties();
emailProperties.put("mail.smtp.port", emailPort);
emailProperties.put("mail.smtp.auth", smtpAuth);
emailProperties.put("mail.smtp.starttls.enable", starttls);
Log.i("GMail", "Mail server properties set.");
}
public MimeMessage createEmailMessage() throws AddressException,
MessagingException, UnsupportedEncodingException {
mailSession = Session.getDefaultInstance(emailProperties, null);
emailMessage = new MimeMessage(mailSession);
emailMessage.setFrom(new InternetAddress(fromEmail, fromEmail));
for (String toEmail : toEmailList) {
Log.i("GMail", "toEmail: " + toEmail);
emailMessage.addRecipient(Message.RecipientType.TO,
new InternetAddress(toEmail));
}
emailMessage.setSubject(emailSubject);
emailMessage.setContent(emailBody, "text/html");// for a html email
// emailMessage.setText(emailBody);// for a text email
Log.i("GMail", "Email Message created.");
return emailMessage;
}
public void sendEmail() throws AddressException, MessagingException {
Transport transport = mailSession.getTransport("smtp");
transport.connect(emailHost, fromEmail, fromPassword);
Log.i("GMail", "allrecipients: " + emailMessage.getAllRecipients());
transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
transport.close();
Log.i("GMail", "Email sent successfully.");
}
}
发送邮件任务.java
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.util.Log;
import java.util.List;
public class SendMailTask extends AsyncTask {
private ProgressDialog statusDialog;
private Activity sendMailActivity;
public SendMailTask(Activity activity) {
sendMailActivity = activity;
}
protected void onPreExecute() {
statusDialog = new ProgressDialog(sendMailActivity);
statusDialog.setMessage("Getting ready...");
statusDialog.setIndeterminate(false);
statusDialog.setCancelable(false);
statusDialog.show();
}
@Override
protected Object doInBackground(Object... args) {
try {
Log.i("SendMailTask", "About to instantiate GMail...");
publishProgress("Processing input....");
GMail androidEmail = new GMail(args[0].toString(),
args[1].toString(), (List) args[2], args[3].toString(),
args[4].toString());
publishProgress("Preparing mail message....");
androidEmail.createEmailMessage();
publishProgress("Sending email....");
androidEmail.sendEmail();
publishProgress("Email Sent.");
Log.i("SendMailTask", "Mail Sent.");
} catch (Exception e) {
publishProgress(e.getMessage());
Log.e("SendMailTask", e.getMessage(), e);
}
return null;
}
@Override
public void onProgressUpdate(Object... values) {
statusDialog.setMessage(values[0].toString());
}
@Override
public void onPostExecute(Object result) {
statusDialog.dismiss();
}
}
第 3 步：现在您可以根据需要更改此类，也可以使用此类发送多封邮件。 我提供了 xml 和 java 文件。
活动_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="30dp">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="From Email" />
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:cursorVisible="true"
android:editable="true"
android:ems="10"
android:enabled="true"
android:inputType="textEmailAddress"
android:padding="5dp"
android:textColor="#000000">
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="Password (For from email)" />
<EditText
android:id="@+id/editText2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:ems="10"
android:inputType="textPassword"
android:padding="5dp"
android:textColor="#000000" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="To Email" />
<EditText
android:id="@+id/editText3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffffff"
android:ems="10"
android:inputType="textEmailAddress"
android:padding="5dp"
android:textColor="#000000" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="Subject" />
<EditText
android:id="@+id/editText4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffffff"
android:ems="10"
android:padding="5dp"
android:textColor="#000000" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:text="Body" />
<EditText
android:id="@+id/editText5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffffff"
android:ems="10"
android:inputType="textMultiLine"
android:padding="35dp"
android:textColor="#000000" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send Email" />
</LinearLayout>
发送邮件活动.java
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.Arrays;
import java.util.List;
public class SendMailActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button send = (Button) this.findViewById(R.id.button1);
send.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.i("SendMailActivity", "Send Button Clicked.");
String fromEmail = ((TextView) findViewById(R.id.editText1))
.getText().toString();
String fromPassword = ((TextView) findViewById(R.id.editText2))
.getText().toString();
String toEmails = ((TextView) findViewById(R.id.editText3))
.getText().toString();
List<String> toEmailList = Arrays.asList(toEmails
.split("\\s*,\\s*"));
Log.i("SendMailActivity", "To List: " + toEmailList);
String emailSubject = ((TextView) findViewById(R.id.editText4))
.getText().toString();
String emailBody = ((TextView) findViewById(R.id.editText5))
.getText().toString();
new SendMailTask(SendMailActivity.this).execute(fromEmail,
fromPassword, toEmailList, emailSubject, emailBody);
}
});
}
}
注意不要忘记在您的 AndroidManifest.xml 文件中添加互联网权限
<uses-permission android:name="android.permission.INTERNET"/>
希望它工作，如果它不是然后只是在下面评论。
为了帮助那些在 SDK 目标 >9 的情况下在主线程上获得网络异常的人。 这是使用上面droopie的代码，但对任何代码都类似。
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
android.os.NetworkOnMainThreadException
您可以使用 AsyncTask 如下
public void onClickMail(View view) {
new SendEmailAsyncTask().execute();
}
class SendEmailAsyncTask extends AsyncTask <Void, Void, Boolean> {
Mail m = new Mail("from@gmail.com", "my password");
public SendEmailAsyncTask() {
if (BuildConfig.DEBUG) Log.v(SendEmailAsyncTask.class.getName(), "SendEmailAsyncTask()");
String[] toArr = { "to mail@gmail.com"};
m.setTo(toArr);
m.setFrom("from mail@gmail.com");
m.setSubject("Email from Android");
m.setBody("body.");
}
@Override
protected Boolean doInBackground(Void... params) {
if (BuildConfig.DEBUG) Log.v(SendEmailAsyncTask.class.getName(), "doInBackground()");
try {
m.send();
return true;
} catch (AuthenticationFailedException e) {
Log.e(SendEmailAsyncTask.class.getName(), "Bad account details");
e.printStackTrace();
return false;
} catch (MessagingException e) {
Log.e(SendEmailAsyncTask.class.getName(), m.getTo(null) + "failed");
e.printStackTrace();
return false;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
使用 SMTP 是一种方法，其他人已经指出了如何去做。 请注意，在执行此操作时，您完全绕过了内置的邮件应用程序，并且您必须在代码中静态提供 SMTP 服务器的地址、该服务器的用户名和密码，或者从用户那里查询.
另一种方法是使用一个简单的服务器端脚本，比如 php，它接受一些 URL 参数并使用它们来发送邮件。 这样，您只需要从设备发出 HTTP 请求（使用内置库很容易实现），而无需在设备上存储 SMTP 登录数据。 与直接使用 SMTP 相比，这是一种更多的间接方式，但由于从 PHP 发出 HTTP 请求和发送邮件非常容易，因此它甚至可能比直接方式更简单。
如果邮件是从他已经在手机上注册的用户默认邮件帐户发送的，则必须采取其他方法。 如果您有足够的时间和经验，您可能需要检查 Android 电子邮件应用程序的源代码，看看它是否提供了一些无需用户交互即可发送邮件的入口点（我不知道，但也许有）。
也许您甚至可以找到一种查询用户帐户详细信息的方法（这样您就可以将它们用于 SMTP），尽管我非常怀疑这是可能的，因为这会带来巨大的安全风险，而且 Android 的构建相当安全。
这是一个也适用于我的替代版本并带有附件（上面已经发布，但完整版本与源链接不同，人们发布的源链接由于缺少数据而无法使用）
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[] toArr) {
// TODO Auto-generated method stub
this._to=toArr;
}
public void setFrom(String string) {
// TODO Auto-generated method stub
this._from=string;
}
public void setSubject(String string) {
// TODO Auto-generated method stub
this._subject=string;
}
// more of the getters and setters …..
}
并在活动中调用它...
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
Button addImage = (Button) findViewById(R.id.send_email);
addImage.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Mail m = new Mail("gmailusername@gmail.com", "password");
String[] toArr = {"bla@bla.com", "lala@lala.com"};
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(MailApp.this, "Email was sent successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MailApp.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);
}
}
});
}
GmailBackground 是一个小型库，无需用户交互即可在后台发送电子邮件：
用法：
BackgroundMail.newBuilder(this)
.withUsername("username@gmail.com")
.withPassword("password12345")
.withMailto("toemail@gmail.com")
.withType(BackgroundMail.TYPE_PLAIN)
.withSubject("this is the subject")
.withBody("this is the body")
.withOnSuccessCallback(new BackgroundMail.OnSuccessCallback() {
@Override
public void onSuccess() {
//do some magic
}
})
.withOnFailCallback(new BackgroundMail.OnFailCallback() {
@Override
public void onFail() {
//do some magic
}
})
.send();
配置：
repositories {
// ...
maven { url "https://jitpack.io" }
}
dependencies {
compile 'com.github.yesidlazaro:GmailBackground:1.2.0'
}
权限：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
同样对于附件，您需要设置 READ_EXTERNAL_STORAGE 权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
（我自己测试过）
如果使用“smtp.gmail.com”作为默认 smtp 服务器，则警告。
由于他们过于狂热的“可疑活动”政策，谷歌会强迫您经常更改链接的电子邮件帐户密码。 从本质上讲，它将短时间内来自不同国家的重复 smtp 请求视为“可疑活动”。 因为他们假设您（电子邮件帐户持有人）一次只能在一个国家/地区。
当谷歌系统检测到“可疑活动”时，它会阻止进一步的电子邮件，直到您更改密码。 由于您将密码硬编码到应用程序中，因此每次发生这种情况时都必须重新发布应用程序，这并不理想。 这在我身上发生了 3 次，我什至将密码存储在另一台服务器上，每次谷歌强迫我更改密码时都会动态获取密码。
因此，我建议使用众多免费 smtp 提供商之一而不是“smtp.gmail.com”来避免此安全问题。 使用相同的代码，但将“smtp.gmail.com”更改为新的 smtp 转发主机。
编辑：JavaMail 1.5.5声称支持 Android ，因此您不需要其他任何东西。
我已将最新的 JavaMail (1.5.4) 移植到 Android。
Maven Central 有，只需要在
build.gradle添加以下内容即可~~
compile 'eu.ocathain.com.sun.mail:javax.mail:1.5.4'
然后您可以按照官方
教程进行操作。
源代码可在此处获得：
https :
//bitbucket.org/artbristol/javamail-forked-android
我为需要帮助的其他人找到了一个更短的替代方案。 代码是：
package com.example.mail;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendMailTLS {
public static void main(String[] args) {
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!");
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}
希望这有帮助！ 祝你好运！
用于发送带有附件的邮件..
public class SendAttachment{
public static void main(String [] args){
//to address
String to="abc@abc.com";//change accordingly
//from address
final String user="efg@efg.com";//change accordingly
final String password="password";//change accordingly
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);
//1) get the session object
Properties properties = System.getProperties();
properties.put("mail.smtp.port", "465");
properties.put("mail.smtp.host", "smtp.gmail.com");
properties.put("mail.smtp.socketFactory.port", "465");
properties.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
properties.put("mail.smtp.auth", "true");
properties.put("mail.smtp.port", "465");
Session session = Session.getDefaultInstance(properties,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user,password);
}
});
//2) compose message
try{
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(user));
message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
message.setSubject("Hii");
//3) create MimeBodyPart object and set your message content
BodyPart messageBodyPart1 = new MimeBodyPart();
messageBodyPart1.setText("How is This");
//4) create new MimeBodyPart object and set DataHandler object to this object
MimeBodyPart messageBodyPart2 = new MimeBodyPart();
//Location of file to be attached
String filename = Environment.getExternalStorageDirectory().getPath()+"/R2832.zip";//change accordingly
DataSource source = new FileDataSource(filename);
messageBodyPart2.setDataHandler(new DataHandler(source));
messageBodyPart2.setFileName("Hello");
//5) create Multipart object and add MimeBodyPart objects to this object
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart1);
multipart.addBodyPart(messageBodyPart2);
//6) set the multiplart object to the message object
message.setContent(multipart );
//7) send message
Transport.send(message);
System.out.println("MESSAGE SENT....");
}catch (MessagingException ex) {ex.printStackTrace();}
}
}
那些遇到ClassDefNotFoundError尝试ClassDefNotFoundError三个 jar 文件移动到您项目的 lib 文件夹中，它对我有用！！
你考虑过使用 Apache Commons Net 吗？ 从 3.3 开始，只需一个 jar（您可以使用 gradle 或 maven 依赖它）就完成了： http ://blog.dahanne.net/2013/06/17/sending-a-mail-in-java- 和-android-with-apache-commons-net/
无需用户干预，您可以按如下方式发送：
从客户端 apk 发送电子邮件。 这里的mail.jar、activation.jar是发送java邮件所必需的。 如果添加这些 jar，可能会增加 APK 大小。
或者，您可以在服务器端代码使用 Web 服务，它将使用相同的 mail.jar 和 activation.jar 来发送电子邮件。 您可以通过 asynctask 调用网络服务并发送电子邮件。 参考相同的链接。
（但是，您需要知道邮件帐户的凭据）
如果要求jar库尽量小，可以单独包含SMTP/POP3/IMAP功能，避免“dex中方法太多”的问题。
您可以从javanet 网页中选择需要的jar 库，例如mailapi.jar + imap.jar 可以让您访问icloud，IMAP 协议的hotmail 邮件服务器。 （在 additional.jar 和 activation.jar 的帮助下）
我尝试使用@Vinayak B 提交的代码。 但是我收到一条错误消息：没有 smtp 提供程序
我创建了这个新问题，以了解更多信息HERE
毕竟我能够自己修复它。 我不得不使用另一个mail.jar并且我必须确保我的“访问不太安全的应用程序”已打开。
我希望这可以帮助任何有同样问题的人。 完成后，这段代码也适用于谷歌眼镜。
其他答案中提供的所有代码都是正确的并且工作正常，但有点混乱，所以我决定发布一个库（尽管仍在开发中）以更简单的方式使用它： AndroidMail 。
您只需创建一个 MailSender，构建一个邮件并发送它（已经在后台使用 AsyncTask 处理）。
MailSender mailSender = new MailSender(email, password);
Mail.MailBuilder builder = new Mail.MailBuilder();
Mail mail = builder
.setSender(senderMail)
.addRecipient(new Recipient(recipient))
.setText("Hello")
.build();
mailSender.sendMail(mail);
您可以收到已发送电子邮件的通知，它还支持不同的收件人类型（TO、CC 和 BCC）、附件和 html：
MailSender mailSender = new MailSender(email, password);
Mail.MailBuilder builder = new Mail.MailBuilder();
Mail mail = builder
.setSender(senderMail)
.addRecipient(new Recipient(recipient))
.addRecipient(new Recipient(Recipient.TYPE.CC, recipientCC))
.setText("Hello")
.setHtml("<h1 style=\"color:red;\">Hello</h1>")
.addAttachment(new Attachment(filePath, fileName))
.build();
mailSender.sendMail(mail, new MailSender.OnMailSentListener() {
@Override
public void onSuccess() {
// mail sent!
}
@Override
public void onError(Exception error) {
// something bad happened :(
}
});
您可以通过 Gradle 或 Maven 获取它：
compile 'it.enricocandino:androidmail:1.0.0-SNAPSHOT'
如果您有任何问题，请告诉我！ :)
使用 Kotlin 以编程方式发送电子邮件。
我还发现此电子邮件 POP 服务列表非常有用：
如何使用：
val auth = EmailService.UserPassAuthenticator("you@gmail.com", "yourPassword")
val to = listOf(InternetAddress("to@email.com"))
val from = InternetAddress("you@gmail.com")
val email = EmailService.Email(auth, to, from, "Test Subject", "Hello Body World")
val emailService = EmailService("smtp.gmail.com", 465)
GlobalScope.launch { // or however you do background threads
emailService.send(email)
}
代码：
import java.util.*
import javax.mail.*
import javax.mail.internet.InternetAddress
import javax.mail.internet.MimeBodyPart
import javax.mail.internet.MimeMessage
import javax.mail.internet.MimeMultipart
class EmailService(private val server: String, private val port: Int) {
data class Email(
val auth: Authenticator,
val toList: List<InternetAddress>,
val from: Address,
val subject: String,
val body: String
)
class UserPassAuthenticator(private val username: String, private val password: String) : Authenticator() {
override fun getPasswordAuthentication(): PasswordAuthentication {
return PasswordAuthentication(username, password)
}
}
fun send(email: Email) {
val props = Properties()
props["mail.smtp.auth"] = "true"
props["mail.user"] = email.from
props["mail.smtp.host"] = server
props["mail.smtp.port"] = port
props["mail.smtp.starttls.enable"] = "true"
props["mail.smtp.ssl.trust"] = server
props["mail.mime.charset"] = "UTF-8"
val msg: Message = MimeMessage(Session.getDefaultInstance(props, email.auth))
msg.setFrom(email.from)
msg.sentDate = Calendar.getInstance().time
msg.setRecipients(Message.RecipientType.TO, email.toList.toTypedArray())
// msg.setRecipients(Message.RecipientType.CC, email.ccList.toTypedArray())
// msg.setRecipients(Message.RecipientType.BCC, email.bccList.toTypedArray())
msg.replyTo = arrayOf(email.from)
msg.addHeader("X-Mailer", CLIENT_NAME)
msg.addHeader("Precedence", "bulk")
msg.subject = email.subject
msg.setContent(MimeMultipart().apply {
addBodyPart(MimeBodyPart().apply {
setText(email.body, "iso-8859-1")
//setContent(email.htmlBody, "text/html; charset=UTF-8")
})
})
Transport.send(msg)
}
companion object {
const val CLIENT_NAME = "Android StackOverflow programmatic email"
}
}
摇篮：
dependencies {
implementation 'com.sun.mail:android-mail:1.6.4'
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3"
}
安卓清单：
<uses-permission android:name="android.permission.INTERNET" />
这里有很多解决方案。 但是我认为我们必须更改 GMail 的配置以允许从不太安全的设备访问。 转到下面的链接并启用它。 它对我有用
Add jar files mail.jar,activation.jar,additionnal.jar
String sub="Thank you for your online registration" ;
Mail m = new Mail("emailid", "password");
String[] toArr = {"ekkatrainfo@gmail.com",sEmailId};
m.setFrom("ekkatrainfo@gmail.com");
m.setTo(toArr);
m.setSubject(sub);
m.setBody(msg);
try{
if(m.send()) {
} else {
}
} catch(Exception e) {
Log.e("MailApp", "Could not send email", e);
}
package com.example.ekktra;
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[] toArr) {
// TODO Auto-generated method stub
this._to=toArr;
}
public void setFrom(String string) {
// TODO Auto-generated method stub
this._from=string;
}
public void setSubject(String string) {
// TODO Auto-generated method stub
this._subject=string;
}
}
对于那些想在 2020 年将 JavaMail 与 Kotlin 一起使用的人：
实现 'com.sun.mail:android-mail:1.6.5'
实现 'com.sun.mail:android-activation:1.6.5'
实现“org.bouncycastle:bcmail-jdk15on:1.65”
实现 "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.7"
实现“org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.7”
BouncyCastle 是出于安全原因。
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
object Config {
const val EMAIL_FROM = "You_Sender_Email@email.com"
const val PASS_FROM = "Your_Sender_Password"
const val EMAIL_TO = "Your_Destination_Email@email.com"
}
object Mailer {
init {
Security.addProvider(BouncyCastleProvider())
}
private fun props(): Properties = Properties().also {
// Smtp server
it["mail.smtp.host"] = "smtp.gmail.com"
// Change when necessary
it["mail.smtp.auth"] = "true"
it["mail.smtp.port"] = "465"
// Easy and fast way to enable ssl in JavaMail
it["mail.smtp.ssl.enable"] = true
}
// Dont ever use "getDefaultInstance" like other examples do!
private fun session(emailFrom: String, emailPass: String): Session = Session.getInstance(props(), object : Authenticator() {
override fun getPasswordAuthentication(): PasswordAuthentication {
return PasswordAuthentication(emailFrom, emailPass)
}
})
private fun builtMessage(firstName: String, surName: String): String {
return """
<b>Name:</b> $firstName <br/>
<b>Surname:</b> $surName <br/>
""".trimIndent()
}
private fun builtSubject(issue: String, firstName: String, surName: String):String {
return """
$issue | $firstName, $surName
""".trimIndent()
}
private fun sendMessageTo(emailFrom: String, session: Session, message: String, subject: String) {
try {
MimeMessage(session).let { mime ->
mime.setFrom(InternetAddress(emailFrom))
// Adding receiver
mime.addRecipient(Message.RecipientType.TO, InternetAddress(Config.EMAIL_TO))
// Adding subject
mime.subject = subject
// Adding message
mime.setText(message)
// Set Content of Message to Html if needed
mime.setContent(message, "text/html")
// send mail
Transport.send(mime)
}
} catch (e: MessagingException) {
Log.e("","") // Or use timber, it really doesn't matter
}
}
fun sendMail(firstName: String, surName: String) {
// Open a session
val session = session(Config.EMAIL_FROM, Config.PASSWORD_FROM)
// Create a message
val message = builtMessage(firstName, surName)
// Create subject
val subject = builtSubject(firstName, surName)
// Send Email
CoroutineScope(Dispatchers.IO).launch { sendMessageTo(Config.EMAIL_FROM, session, message, subject) }
}
package io.formics.tourguide
import android.annotation.SuppressLint
import android.content.Intent
import android.net.Credentials
import android.net.Uri
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_feedback.*
import org.jetbrains.annotations.Async
import java.lang.Exception
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource
import javax.mail.*
import javax.mail.internet.*
class FeedbackActivity : AppCompatActivity() {
val props = Properties()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_feedback)
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");
btnSendEmail.setOnClickListener {
Thread {
try {
sendEmail()
// Your implementation
} catch (ex: Exception) {
ex.printStackTrace()
}
}.start()
}
}
private fun sendEmail() {
try {
val session = Session.getInstance(props,
object : javax.mail.Authenticator() {
//Authenticating the password
override fun getPasswordAuthentication(): javax.mail.PasswordAuthentication {
return PasswordAuthentication("abc@xyz.com", "password")
}
})
val message = MimeMessage(session);
message.setFrom(InternetAddress("abc@xyz.com"));
message.setRecipients(
Message.RecipientType.TO,
InternetAddress.parse(editCC.text.toString())
)
message.subject = editSubject.text.toString()
message.setText(
"Dear Mail Crawler,"
+ "\n\n No spam to my email, please!"
);
//val messageBodyPart = MimeBodyPart();
//val multipart = MimeMultipart();
//val file = "path of file to be attached";
// val fileName = "attachmentName"
// val source = FileDataSource(file);
//messageBodyPart.setDataHandler(DataHandler(source));
//messageBodyPart.setFileName(fileName);
//multipart.addBodyPart(messageBodyPart);
//message.setContent(multipart);
Transport.send(message);
System.out.println("Done");
} catch (e: MessagingException) {
throw RuntimeException(e);
}
}
}
要添加附件，不要忘记添加。
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);
使用JavaMail API在Android Studio App中发送电子邮件：服务器连接代码中的错误
[英]Sending Email in Android Studio App using JavaMail API: Bug in server connecting code
在Android应用程序中使用JavaMail API保存电子邮件密码的位置？
[英]Where to save the password for email in Android app (using JavaMail API)?
使用JavaMail API在Android中发送电子邮件不确定发件人和收件人的电子邮件地址
[英]Sending Email in Android using JavaMail API not sure about sender and recipient email address
使用 JavaMail API 在 servicemix 下发送 email 时发生 ClassCastException
[英]ClassCastException when sending email under servicemix using JavaMail API
使用Javamail发送带有附件的电子邮件会引发UnsupportedDataException
[英]Sending a email with an attachment using Javamail throws UnsupportedDataException
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