无法通过javamail-android发送邮件

Question

我阅读了javamail-android的指南和一些关于StackOverflow的帖子。例如。如何在Android中使用JavaMail API发送邮件？我收到消息“邮件发送成功...”。但邮件不会到达收件人地址。我有以下输出：

02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ android.os.NetworkOnMainThreadException
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at java.net.InetAddress.getByName(InetAddress.java:289)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.URLName.getHostAddress(URLName.java:487)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.URLName.hashCode(URLName.java:463)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at java.util.Collections.secondaryHash(Collections.java:3405)
02-11 09:53:38.988    2674-2674/com.example.mailapp W/System.err﹕ at java.util.Hashtable.get(Hashtable.java:265)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.Session.getPasswordAuthentication(Session.java:823)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.Service.connect(Service.java:271)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.Service.connect(Service.java:169)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.Service.connect(Service.java:118)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.Transport.send0(Transport.java:188)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at javax.mail.Transport.send(Transport.java:118)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at com.example.mailapp.GMailSender.sendMail(GMailSender.java:64)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at com.example.mailapp.MyActivity$1.onClick(MyActivity.java:35)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at android.view.View.performClick(View.java:4438)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at android.view.View$PerformClick.run(View.java:18422)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:733)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at android.os.Looper.loop(Looper.java:136)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5017)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-11 09:53:38.998    2674-2674/com.example.mailapp W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)

我如何修复它或使用另一种方式发送电子邮件？

Answer 1

您得到这个错误是因为您正在主线程上执行网络操作，网络操作花费了前所未有的时间，不应该在主线程上调用。对其使用异步任务。异步任务将创建另一个线程来执行网络任务（您也可以将它用于任何任务）。

添加代码以执行DoInBackground方法中的操作，并使用以下方法调用它：

   new senmailAsync().execute();

例如：

private class senmailAsync extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... params) {
            GMailSender gMailSender = new GMailSender();
            gMailSender.sendMail("hi", "hi", authPreferences.getUser(), authPreferences.getToken(), "[e-mail]");
            Log.v("ranjapp", "sent mail " + authPreferences.getUser() + "  " + authPreferences.getToken());
            return null;
        }
    }

在此处完成教程