应用无法发送电子邮件
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嗨，我想从android模拟器发送一封电子邮件。目前，即使对于Playstore，模拟器中也没有gmail登录，我正在通过按钮从服务和服务启动asynctask。以下是启动服务的代码段：
Button email = (Button)findViewById(R.id.btn_mail);
email.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startService(new Intent(MainActivity.this,EmailService.class));
}
});
MyService文件：
package logger.ugi.readlog;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.widget.Toast;
/**
* Created by Lenovo on 05/03/2018.
*/
public class EmailService extends Service {
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
new EmailAsyncTask().execute();
if(isOnline()){
// new EmailAsyncTask().execute();
}else{
Toast.makeText(getApplicationContext(),"Check your Network Connection!",Toast.LENGTH_LONG).show();
}
return START_STICKY;
}
public boolean isOnline() {
ConnectivityManager cm =
(ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
}
MyAsyncTask文件：
package logger.ugi.readlog;
import android.os.AsyncTask;
import android.os.Environment;
import javax.mail.PasswordAuthentication;
import java.io.File;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.Multipart;
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 EmailAsyncTask extends AsyncTask<Void,Void,Void> {
@Override
protected Void doInBackground(Void... voids) {
final String username = "sukand@ugi.com";
final String password = "abcd";
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("sukand@ugi.com"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse("abc@gmail.com"));
message.setSubject("Testing Subject");
message.setText("Dear Mail Crawler,"
+ "
No spam to my email, please!");
MimeBodyPart messageBodyPart = new MimeBodyPart();
Multipart multipart = new MimeMultipart();
String file = "";
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File (sdCard.getAbsolutePath() + "/myLogcat");
String fileName = "logcat.txt";
DataSource source = new FileDataSource(dir);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(fileName);
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
Transport.send(message);
System.out.println("Done");
} catch (Exception e) {
throw new RuntimeException(e);
}
return null;
}
}
问题是它没有发送任何电子邮件，我在日志中获得的是：
03-06 02:22:16.501 4543-4543/logger.ugi.readlog I/dalvikvm: Failed resolving Ljavax/activation/DataHandler; interface 2291 'Ljava/awt/datatransfer/Transferable;'
03-06 02:22:16.501 4543-4543/logger.ugi.readlog W/dalvikvm: Link of class 'Ljavax/activation/DataHandler;' failed
03-06 02:22:16.501 4543-4543/logger.ugi.readlog E/dalvikvm: Could not find class 'javax.activation.DataHandler', referenced from method logger.ugi.readlog.EmailAsyncTask.doInBackground
03-06 02:22:16.501 4543-4543/logger.ugi.readlog W/dalvikvm: VFY: unable to resolve new-instance 2534 (Ljavax/activation/DataHandler;) in Llogger/ugi/readlog/EmailAsyncTask;
03-06 02:22:16.501 4543-4543/logger.ugi.readlog D/dalvikvm: VFY: replacing opcode 0x22 at 0x0096
03-06 02:22:16.501 4543-4543/logger.ugi.readlog I/dalvikvm: Failed resolving Ljavax/activation/DataHandler; interface 2291 'Ljava/awt/datatransfer/Transferable;'
03-06 02:22:16.501 4543-4543/logger.ugi.readlog W/dalvikvm: Link of class 'Ljavax/activation/DataHandler;' failed
03-06 02:22:16.501 4543-4543/logger.ugi.readlog D/dalvikvm: DexOpt: unable to opt direct call 0x4c2c at 0x98 in Llogger/ugi/readlog/EmailAsyncTask;.doInBackground
03-06 02:22:16.505 4543-4599/logger.ugi.readlog D/dalvikvm: GC_FOR_ALLOC freed 328K, 17% free 3017K/3624K, paused 2ms, total 2ms
03-06 02:22:16.513 4543-4599/logger.ugi.readlog D/dalvikvm: GC_FOR_ALLOC freed 302K, 16% free 3071K/3624K, paused 4ms, total 4ms
03-06 02:22:16.521 4543-4599/logger.ugi.readlog D/dalvikvm: GC_FOR_ALLOC freed 306K, 16% free 3072K/3624K, paused 3ms, total 3ms
03-06 02:22:16.525 4543-4599/logger.ugi.readlog D/dalvikvm: GC_FOR_ALLOC freed 309K, 17% free 3017K/3624K, paused 2ms, total 2ms
Gradle文件：
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "logger.ugi.readlog"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile group: 'javax.mail', name: 'mail', version: '1.4.7'
compile group: 'javax.activation', name: 'activation', version: '1.1'
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}
清单文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="logger.ugi.readlog">
<uses-permission android:name="android.permission.READ_LOGS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".LogService"
android:enabled="true"
android:exported="true"/>
<service android:name=".EmailService"/>
</application>
</manifest>
请帮我解决这个问题。
编辑：EmailAsyncTask没有启动，所以暂时修复我无法检查互联网是否连接。更改此项后，AsyncTask启动，现在出现的错误是：
03-06 19:47:15.746 21703-21715/logger.ugi.readlog E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: logger.ugi.readlog, PID: 21703
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$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)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.RuntimeException: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25;
nested exception is:
java.net.ConnectException: failed to connect to smtp.gmail.com/74.125.130.108 (port 25): connect failed: ETIMEDOUT (Connection timed out)
at logger.ugi.readlog.EmailAsyncTask.doInBackground(EmailAsyncTask.java:90)
at logger.ugi.readlog.EmailAsyncTask.doInBackground(EmailAsyncTask.java:28)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
... 4 more
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25;
nested exception is:
java.net.ConnectException: failed to connect to smtp.gmail.com/74.125.130.108 (port 25): connect failed: ETIMEDOUT (Connection timed out)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1391)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
at javax.mail.Service.connect(Service.java:310)
at javax.mail.Service.connect(Service.java:169)
at javax.mail.Service.connect(Service.java:118)
at javax.mail.Transport.send0(Transport.java:188)
at javax.mail.Transport.send(Transport.java:118)
at logger.ugi.readlog.EmailAsyncTask.doInBackground(EmailAsyncTask.java:83)
... 7 more
Caused by: java.net.ConnectException: failed to connect to smtp.gmail.com/74.125.130.108 (port 25): connect failed: ETIMEDOUT (Connection timed out)
at libcore.io.IoBridge.connect(IoBridge.java:114)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
at java.net.Socket.connect(Socket.java:843)
at java.net.Socket.connect(Socket.java:786)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:233)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1359)
... 14 more
Caused by: libcore.io.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
at libcore.io.Posix.connect(Native Method)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
at libcore.io.IoBridge.connect(IoBridge.java:112)
... 21 more
我试过从587-> 625-> 25更改端口，但没有一个能够解决。请帮忙。
答案
您正在尝试使用Android中不存在的Java mail api。您需要使用Android-specific library发送电子邮件或自己as mentioned here实现缺少的组件。
另一答案
使用特殊的JavaMail for Android。 （该页面已过期;当前版本为1.6.1。）
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