以编程方式发送自动电子邮件

Question

我希望能够通过程序发送电子邮件。

我尝试了以下代码。

final Intent emailIntent = new Intent( android.content.Intent.ACTION_SEND);

  emailIntent.setType("plain/text");

  emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
          new String[] { "[e-mail]" });

  emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,
          "Email Subject");

  emailIntent.putExtra(android.content.Intent.EXTRA_TEXT,
          "Email Body");

  startActivity(Intent.createChooser(
          emailIntent, "Send mail..."));

但问题在于在发送电子邮件之前，应用程序会打开活动。

我想直接发送电子邮件而不打开撰写活动。这可能吗？

- Kamran Omar

---

为什么不尝试使用__startActivityForResult__呢？ - Navaneeth Sen

这个回答解决了你的问题吗？在Android中使用JavaMail API发送电子邮件，而不使用默认/内置应用程序 - Ryan M

Answer 1

参考链接有正确答案，但是有一些库可以让你的工作更轻松。

• https://github.com/yesidlazaro/GmailBackground
• https://github.com/thegenuinegourav/Android-Email-App-using-Javamail-Api
• https://github.com/prashantwosti/BackgroundMailLibrary

所以不要重新编写所有的代码，只需使用这些库中的任何一个，并在短时间内完成您的工作。

- Khemraj Sharma

Answer 2

使用Kotlin编程以编程方式发送电子邮件。

• 仅进行简单的电子邮件发送，不包括其他功能（如附件）。
• TLS始终开启
• 只需要一个gradle电子邮件依赖项。

我还发现这个电子邮件POP服务列表非常有用：

https://support.office.com/en-gb/article/pop-and-imap-email-settings-for-outlook-8361e398-8af4-4e97-b147-6c6c4ac95353

如何使用：

    val auth = EmailService.UserPassAuthenticator("yourUser", "yourPass")
    val to = listOf(InternetAddress("[e-mail]"))
    val from = InternetAddress("[e-mail]")
    val email = EmailService.Email(auth, to, from, "Test Subject", "Hello Body World")
    val emailService = EmailService("yourSmtpServer", 587)

    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 var server: String, private var 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"
    }
}

Gradle：

dependencies {
    implementation 'com.sun.mail:android-mail:1.6.4'
    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.3"
}

AndroidManifest:

<uses-permission name="android.permission.INTERNET" />

- Blundell

Answer 3

这可能是最简单的方法-

    String recipientList = mEditTextTo.getText().toString();
    String[] recipients = recipientList.split(",");

    String subject = mEditTextSubject.getText().toString();
    String message = mEditTextMessage.getText().toString();

    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.putExtra(Intent.EXTRA_EMAIL, recipients);
    intent.putExtra(Intent.EXTRA_SUBJECT, subject);
    intent.putExtra(Intent.EXTRA_TEXT, message);

    intent.setType("message/rfc822");
    startActivity(Intent.createChooser(intent, "Choose an email client"));

- Shivam Gautam