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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);
    

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via Stack Overflow by Alxs24
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This exception has no message.
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This exception has no message.
android.os.NetworkOnMainThreadException: 	at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)	at java.net.InetAddress.lookupHostByName(InetAddress.java:418)	at java.net.InetAddress.getAllByNameImpl(InetAddress.java:252)	at java.net.InetAddress.getAllByName(InetAddress.java:215)	at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:142)	at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:169)	at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:124)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:365)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:560)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:492)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:470)	at com.example.eagle.start1.JSONParser.makeHttpRequest(JSONParser.java:118)	at com.example.eagle.start1.ResultPage$result$1.run(ResultPage.java:135)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5254)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)