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  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 GitHub by alexblack
, 2 years ago
This exception has no message.
via Stack Overflow by Shohom Shahd
, 2 years ago
This exception has no message.
via Stack Overflow by Paul S
, 2 years ago
This exception has no message.
via Stack Overflow by Nimila Hiranya
, 2 years ago
via Stack Overflow by user3499284
, 2 years ago
This exception has no message.
android.os.NetworkOnMainThreadException: 	at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)	at java.net.InetAddress.lookupHostByName(InetAddress.java:418)	at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)	at java.net.InetAddress.getAllByName(InetAddress.java:215)	at com.android.okhttp.HostResolver$1.getAllByName(HostResolver.java:29)	at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:232)	at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:124)	at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:272)	at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)	at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)	at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)	at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:500)	at com.example.accurat.webservice.MainActivity$1.onClick(MainActivity.java:53)	at android.view.View.performClick(View.java:4780)	at android.view.View$PerformClick.run(View.java:19866)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)