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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();
android.os.NetworkOnMainThreadException: 	at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(	at	at	at org.apache.logging.log4j.core.util.NetUtils.getLocalHostname(	at org.apache.logging.log4j.core.LoggerContext.setConfiguration(	at org.apache.logging.log4j.core.LoggerContext.reconfigure(	at org.apache.logging.log4j.core.LoggerContext.start(	at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(	at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(	at org.apache.logging.log4j.LogManager.getLogger(	at com.torointl.log4j2xtest.MyActivity.(	at java.lang.Class.newInstanceImpl(Native Method)	at java.lang.Class.newInstance(	at	at	at	at$800(	at$H.handleMessage(	at android.os.Handler.dispatchMessage(	at android.os.Looper.loop(	at	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(	at$	at	at dalvik.system.NativeStart.main(Native Method)