我有一个简单的Android一键式应用程序，按下按钮时会发送自动电子邮件。该应用程序在模拟器中工作正常，但在真实设备（三星GT-n7000）上该应用程序将无法正常工作。该设备仅与Wi-Fi连接。
以下是代码：
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.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 GMailSender 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 GMailSender() {
_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 GMailSender(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 javax.mail.PasswordAuthentication getPasswordAuthentication() {
return new javax.mail.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 String[] get_to() {
return _to;
}
public void set_to(String[] _to) {
this._to = _to;
}
public String get_from() {
return _from;
}
public void set_from(String _from) {
this._from = _from;
}
public String get_subject() {
return _subject;
}
public void set_subject(String _subject) {
this._subject = _subject;
}
}
MainClass：
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void sending(View v) {
GMailSender mailsender = new GMailSender("example@gmail.com", "password");
String[] toArr = { "mussa2kasssim@hotmail.com" };
mailsender.set_to(toArr);
mailsender.set_from("example@gmail.com");
mailsender.set_subject("This is an email sent using my Mail JavaMail wrapper from an Android device.");
mailsender.setBody("Hello World!");
// mailsender.send();
try {
//mailsender.addAttachment("/sdcard/filelocation");
if (mailsender.send()) {
Toast.makeText(MainActivity.this,
"Email was sent successfully.",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "Email was not sent.",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
Log.e("MailApp", "Could not send email", e);
}
}
}
注意：“example@gmail.com”和“密码”被替换为真实值。
请帮忙。谢谢
清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nikhil.emailing"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.emailing.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.emailing.EmailActivity"
android:label="@string/title_activity_email" >
</activity>
</application>
</manifest>
XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:onClick="sending"
android:text="Email" />
</RelativeLayout>
错误日志：
11-07 12:43:07.616: ERROR/lights(1845): write_int: path/sys/devices/virtual/sec/sec_touchkey/brightness, value 1
11-07 12:43:07.841: ERROR/MailApp(24559): Could not send email
11-07 12:43:07.841: ERROR/MailApp(24559): android.os.NetworkOnMainThreadException
11-07 12:43:07.841: ERROR/MailApp(24559): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
11-07 12:43:07.841: ERROR/MailApp(24559): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
11-07 12:43:07.841: ERROR/MailApp(24559): at java.net.InetAddress.getLocalHost(InetAddress.java:371)
11-07 12:43:07.841: ERROR/MailApp(24559): at javax.mail.internet.InternetAddress.getLocalAddress(InternetAddress.java:517)
11-07 12:43:07.841: ERROR/MailApp(24559): at javax.mail.internet.UniqueValue.getUniqueMessageIDValue(UniqueValue.java:99)
11-07 12:43:07.841: ERROR/MailApp(24559): at javax.mail.internet.MimeMessage.updateMessageID(MimeMessage.java:2054)
11-07 12:43:07.841: ERROR/MailApp(24559): at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2076)
11-07 12:43:07.841: ERROR/MailApp(24559): at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2042)
11-07 12:43:07.841: ERROR/MailApp(24559): at javax.mail.Transport.send(Transport.java:117)
11-07 12:43:07.841: ERROR/MailApp(24559): at com.nikhil.emailing.GMailSender.send(GMailSender.java:105)
11-07 12:43:07.841: ERROR/MailApp(24559): at com.nikhil.emailing.MainActivity.sending(MainActivity.java:31)
11-07 12:43:07.841: ERROR/MailApp(24559): at java.lang.reflect.Method.invokeNative(Native Method)
11-07 12:43:07.841: ERROR/MailApp(24559): at java.lang.reflect.Method.invoke(Method.java:511)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.view.View$1.onClick(View.java:3095)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.view.View.performClick(View.java:3627)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.view.View$PerformClick.run(View.java:14329)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.os.Handler.handleCallback(Handler.java:605)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.os.Handler.dispatchMessage(Handler.java:92)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.os.Looper.loop(Looper.java:137)
11-07 12:43:07.841: ERROR/MailApp(24559): at android.app.ActivityThread.main(ActivityThread.java:4511)
11-07 12:43:07.841: ERROR/MailApp(24559): at java.lang.reflect.Method.invokeNative(Native Method)
11-07 12:43:07.841: ERROR/MailApp(24559): at java.lang.reflect.Method.invoke(Method.java:511)
11-07 12:43:07.841: ERROR/MailApp(24559): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)
11-07 12:43:07.841: ERROR/MailApp(24559): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747)
11-07 12:43:07.841: ERROR/MailApp(24559): at dalvik.system.NativeStart.main(Native Method)
11-07 12:43:08.786: ERROR/DataRouter(1690): usb connection is true
11-07 12:43:08.786: ERROR/DataRouter(1690): DSR is ON. Don't send DTR ON.
11-07 12:43:09.121: ERROR/lights(1845): write_int: path /sys/devices/virtual/sec/sec_touchkey/brightness, value 2
11-07 12:43:09.741: ERROR/AlarmManagerService(1845): android_server_AlarmManagerService_set to type=1, 1383830133.779000000
11-07 12:43:09.896: ERROR/AlarmManagerService(1845): android_server_AlarmManagerService_set to type=1, 1383828192.898000000
11-07 12:43:10.791: ERROR/DataRouter(1690): usb connection is true
11-07 12:43:10.791: ERROR/DataRouter(1690): DSR is ON. Don't send DTR ON.
11-07 12:43:12.791: ERROR/DataRouter(1690): usb connection is true
11-07 12:43:12.791: ERROR/DataRouter(1690): DSR is ON. Don't send DTR ON.
11-07 12:43:12.896: ERROR/AlarmManagerService(1845): android_server_AlarmManagerService_set to type=1, 1383830133.779000000
11-07 12:43:13.036: ERROR/AlarmManagerService(1845): android_server_AlarmManagerService_set to type=1, 1383828196.040000000
答案 0 :(得分：1)
异常说android.os.NetworkOnMainThreadException
这意味着不应该在主线程（特定于UI线程）上执行与网络相关的任务。 在后台线程上运行它，它将工作。
答案 1 :(得分：0)
相关任务应该在AsyncTask中执行。
答案 2 :(得分：0)
它与一些ThreadPolicy有关，我从另一篇文章中读到它。它基本上阻止了应用程序启动的连接。因此，要禁用此策略，我必须使用连接将此段代码放在活动的onCreate（）中。
代码是：
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
它按预期工作：））