编辑： Hiren 给出的解决方案奏效了。非常感谢！对于那些有类似问题的人，请按照这些说明进行操作并查看以下内容：Android Honeycomb: NetworkOnMainThreadException even when using AsyncTask and no strict mode?
再次感谢！
我正在为 Galaxy 选项卡开发应用程序，但无法从该选项卡发送电子邮件。我发现的代码可以在其他地方（包括我的手机）使用，但确实可以not work on the tab。
当我尝试通过 javamail 发送邮件时遇到的异常是这样的：
不加载file: /system/lib/javamail.providers
我尝试使用下面建议的解决方案，但出现以下异常：
01-21 14:30:14.340: E/MailApp(3515): Could not send email
01-21 14:30:14.340: E/MailApp(3515): android.os.NetworkOnMainThreadException
01-21 14:30:14.340: E/MailApp(3515): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
01-21 14:30:14.340: E/MailApp(3515): at java.net.InetAddress.lookupHostByName(InetAddress.java:477)
01-21 14:30:14.340: E/MailApp(3515): at java.net.InetAddress.getLocalHost(InetAddress.java:445)
01-21 14:30:14.340: E/MailApp(3515): at javax.mail.internet.InternetAddress.getLocalAddress(InternetAddress.java:517)
01-21 14:30:14.340: E/MailApp(3515): at javax.mail.internet.UniqueValue.getUniqueMessageIDValue(UniqueValue.java:99)
01-21 14:30:14.340: E/MailApp(3515): at javax.mail.internet.MimeMessage.updateMessageID(MimeMessage.java:2054)
01-21 14:30:14.340: E/MailApp(3515): at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2076)
01-21 14:30:14.340: E/MailApp(3515): at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2042)
01-21 14:30:14.340: E/MailApp(3515): at javax.mail.Transport.send(Transport.java:117)
01-21 14:30:14.340: E/MailApp(3515): at android.app.Mail.send(Mail.java:136)
01-21 14:30:14.340: E/MailApp(3515): at android.app.ConfirmationActivity.onSubmit(ConfirmationActivity.java:151)
01-21 14:30:14.340: E/MailApp(3515): at java.lang.reflect.Method.invokeNative(Native Method)
01-21 14:30:14.340: E/MailApp(3515): at java.lang.reflect.Method.invoke(Method.java:491)
01-21 14:30:14.340: E/MailApp(3515): at android.view.View$1.onClick(View.java:2695)
01-21 14:30:14.340: E/MailApp(3515): at android.view.View.performClick(View.java:3127)
01-21 14:30:14.340: E/MailApp(3515): at android.view.View$PerformClick.run(View.java:12025)
01-21 14:30:14.340: E/MailApp(3515): at android.os.Handler.handleCallback(Handler.java:587)
01-21 14:30:14.340: E/MailApp(3515): at android.os.Handler.dispatchMessage(Handler.java:92)
01-21 14:30:14.340: E/MailApp(3515): at android.os.Looper.loop(Looper.java:132)
01-21 14:30:14.340: E/MailApp(3515): at android.app.ActivityThread.main(ActivityThread.java:4126)
01-21 14:30:14.340: E/MailApp(3515): at java.lang.reflect.Method.invokeNative(Native Method)
01-21 14:30:14.340: E/MailApp(3515): at java.lang.reflect.Method.invoke(Method.java:491)
01-21 14:30:14.340: E/MailApp(3515): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844)
01-21 14:30:14.340: E/MailApp(3515): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
01-21 14:30:14.340: E/MailApp(3515): at dalvik.system.NativeStart.main(Native Method)