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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);
    
android.os.NetworkOnMainThreadException: 	at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1148)	at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)	at libcore.io.IoBridge.connectErrno(IoBridge.java:127)	at libcore.io.IoBridge.connect(IoBridge.java:112)	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)	at java.net.Socket.startupSocket(Socket.java:599)	at java.net.Socket.tryAllAddresses(Socket.java:161)	at java.net.Socket.(Socket.java:211)	at java.net.Socket.(Socket.java:183)	at com.example.siva.shivaproject.ClientSocket$1$1.run(ClientSocket.java:57)	at java.lang.Thread.run(Thread.java:841)	at com.example.siva.shivaproject.ClientSocket$1.onClick(ClientSocket.java:99)	at android.view.View.performClick(View.java:4457)	at android.view.View$PerformClick.run(View.java:18491)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5336)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:873)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:689)	at dalvik.system.NativeStart.main(Native Method)