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Samebug tips

  1. ,
    via Stack Overflow by Razgriz

    Happens when you make a network call on the main UI thread of the Android application which results in a UI freeze until the network call is complete and the response is received. Instead, execute the network calls in the background: use AsyncTask.

  2. ,

    An alternative for just getting rid of the Exception is use StrictMode.ThreadPolicy to force execute on main thread.

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);
    

Solutions on the web

via Stack Overflow by sanketh
, 2 years ago
via Stack Overflow by user1457104
, 2 years ago
This exception has no message.
via Stack Overflow by Unknown author, 2 years ago
via Stack Overflow by Zhen Chua
, 2 years ago
via Stack Overflow by BangBoat
, 2 years ago
This exception has no message.
android.os.NetworkOnMainThreadException: 	at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)	at java.net.InetAddress.lookupHostByName(InetAddress.java:385)	at java.net.InetAddress.getLocalHost(InetAddress.java:365)	at javax.mail.internet.InternetAddress.getLocalAddress(InternetAddress.java:517)	at javax.mail.internet.UniqueValue.getUniqueMessageIDValue(UniqueValue.java:99)	at javax.mail.internet.MimeMessage.updateMessageID(MimeMessage.java:2054)	at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2076)	at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2042)	at javax.mail.Transport.send(Transport.java:117)	at com.example.emailsendnoui.sending.send(sending.java:119)	at com.example.emailsendnoui.MainActivitySecond.send_mail(MainActivitySecond.java:86)	at com.example.emailsendnoui.MainActivitySecond.access$0(MainActivitySecond.java:73)	at com.example.emailsendnoui.MainActivitySecond$1.onClick(MainActivitySecond.java:47)	at android.view.View.performClick(View.java:4240)	at android.view.View$PerformClick.run(View.java:17721)	at android.os.Handler.handleCallback(Handler.java:730)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5103)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)