我试图在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;我试图发送邮件按钮点击直接不使用这个应用程序。
当前回答
对于那些想在2020年与Kotlin一起使用JavaMail的人:
首先:将这些依赖项添加到构建中。gradle文件(官方JavaMail Maven依赖项)
实现“com.sun.mail: android-mail: 1.6.5” 实现“com.sun.mail: android激活: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是出于安全考虑。
第二步:将这些权限添加到AndroidManifest.xml中
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
第三:当使用SMTP时，创建一个配置文件
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"
}
第四:创建Mailer对象
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) }
}
Note
If you want a more secure way to send your email (and you want a more secure way!), use http as mentioned in the solutions before (I will maybe add it later in this answer) You have to properly check, if the users phone has internet access, otherwise the app will crash. When using gmail, enable "less secure apps" (this will not work, when you gmail has two factors enabled) https://myaccount.google.com/lesssecureapps?pli=1 Some credits belong to: https://medium.com/@chetan.garg36/android-send-mails-not-intent-642d2a71d2ee (he used RxJava for his solution)
其他回答
为了帮助那些获得网络主线程异常与SDK目标>9。这是使用droopie的代码上面，但将类似于任何工作。
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
android.os.NetworkOnMainThreadException
您可以如下所示使用AsyncTask
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;
}
}
要加附件，别忘了加。
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);
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);
}
}
}
对于那些想在2020年与Kotlin一起使用JavaMail的人:
首先:将这些依赖项添加到构建中。gradle文件(官方JavaMail Maven依赖项)
实现“com.sun.mail: android-mail: 1.6.5” 实现“com.sun.mail: android激活: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是出于安全考虑。
第二步:将这些权限添加到AndroidManifest.xml中
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
第三:当使用SMTP时，创建一个配置文件
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"
}
第四:创建Mailer对象
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) }
}
Note
If you want a more secure way to send your email (and you want a more secure way!), use http as mentioned in the solutions before (I will maybe add it later in this answer) You have to properly check, if the users phone has internet access, otherwise the app will crash. When using gmail, enable "less secure apps" (this will not work, when you gmail has two factors enabled) https://myaccount.google.com/lesssecureapps?pli=1 Some credits belong to: https://medium.com/@chetan.garg36/android-send-mails-not-intent-642d2a71d2ee (he used RxJava for his solution)
无法连接到SMTP主机: Smtp.gmail.com，端口:465
在清单中添加这一行:
<uses-permission android:name="android.permission.INTERNET" />
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