I tried to connect to my web service using JSON in my android app, but I got this error:

Question

E/test(20965): Exception E/AndroidRuntime(20965): FATAL EXCEPTION: main E/AndroidRuntime(20965): java.lang.RuntimeException: Unable to start activity ComponentInfo{sliit.mad.contact_list/sliit.mad.contact_list.TEST}: android.os.NetworkOnMainThreadException E/AndroidRuntime(20965): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2062) E/AndroidRuntime(20965): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2087) E/AndroidRuntime(20965): at android.app.ActivityThread.access$600(ActivityThread.java:133) E/AndroidRuntime(20965): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1198) E/AndroidRuntime(20965): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime(20965): at android.os.Looper.loop(Looper.java:137) E/AndroidRuntime(20965): at android.app.ActivityThread.main(ActivityThread.java:4793) E/AndroidRuntime(20965):at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(20965):at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime(20965):at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:808) E/AndroidRuntime(20965): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:575) E/AndroidRuntime(20965):at dalvik.system.NativeStart.main(Native Method) E/AndroidRuntime(20965): Caused by: android.os.NetworkOnMainThreadException E/AndroidRuntime(20965):at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) E/AndroidRuntime(20965):at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) E/AndroidRuntime(20965):at libcore.io.IoBridge.connectErrno(IoBridge.java:127) E/AndroidRuntime(20965):at libcore.io.IoBridge.connect(IoBridge.java:112) E/AndroidRuntime(20965):at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) E/AndroidRuntime(20965):at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:460) E/AndroidRuntime(20965):at java.net.Socket.connect(Socket.java:832) E/AndroidRuntime(20965):at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) E/AndroidRuntime(20965):at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) E/AndroidRuntime(20965):at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) E/AndroidRuntime(20965):at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) E/AndroidRuntime(20965):at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) E/AndroidRuntime(20965):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) E/AndroidRuntime(20965):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) E/AndroidRuntime(20965):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) E/AndroidRuntime(20965):at sliit.mad.contact_list.JSONParser.makeHttpRequest(JSONParser.java:65) E/AndroidRuntime(20965):at sliit.mad.contact_list.TEST.onCreate(TEST.java:38) E/AndroidRuntime(20965):at android.app.Activity.performCreate(Activity.java:5008) E/AndroidRuntime(20965): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) E/AndroidRuntime(20965):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2026) E/AndroidRuntime(20965):... 11 more

Answer 1

Maybe you already had fixed this issue. but this issue was caused by that you tried to do network operation in the main UI thread and that is not allowed.

The exception log can explain itself.

E/AndroidRuntime(20965): Caused by: android.os.NetworkOnMainThreadException E/AndroidRuntime(20965):at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)