android - application crashes during http connection -

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application crashes when try create http connection when phone connected limited wifi connection, can tell me how check internet working or not in wifi. sorry poor english.

 fatal exception: main         process: com.bytemachine.aditya.vehicletracker, pid: 3626         java.lang.nullpointerexception: attempt invoke interface method 'org.apache.http.httpentity org.apache.http.httpresponse.getentity()' on null object reference         @ com.bytemachine.aditya.vehicletracker.searchscreen$setconnectionforvehiclesearch.onpostexecute(searchscreen.java:561)         @ com.bytemachine.aditya.vehicletracker.searchscreen$setconnectionforvehiclesearch.onpostexecute(searchscreen.java:504)         @ android.os.asynctask.finish(asynctask.java:636)         @ android.os.asynctask.access$500(asynctask.java:177)         @ android.os.asynctask$internalhandler.handlemessage(asynctask.java:653)         @ android.os.handler.dispatchmessage(handler.java:102)         @ android.os.looper.loop(looper.java:145)         @ android.app.activitythread.main(activitythread.java:6946)         @ java.lang.reflect.method.invoke(native method)         @ java.lang.reflect.method.invoke(method.java:372)         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1404)         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1199)

to check network state, can use below code snippet :

    connectivitymanager connectivitymanager = (connectivitymanager) context.getsystemservice(context.connectivity_service);     networkinfo networkinfo = connectivitymanager.getactivenetworkinfo();          if ((networkinfo != null && networkinfo.isconnectedorconnecting()))     {      //network connected, carry on operations     }

you can modify code checking wifi state using connectivitymanager.type_wifi flag. further details refer, https://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html#determineconnection.


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