How to handle php webservice response android? -


i working on android application , getting data php webservice. before calling php webservice, checking internet connection. if connection there asynchronous task start. here getting issue i.e after checking internet connection , while executing background task in asynchronous method power going , @ time crash coming. took boolean variable , kept server=false if try action not executed. when there no internet connection when posting paramaeters php not going catch method , not displaying toast message "try again". please tell me went wrong.

my code:  boolean server = true; @override     public void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);         setcontentview(r.layout.test);  if (havenetworkconnection()) {                     longoperation1 op = new longoperation1();                     op.execute("");                 } else {                     toast.maketext(getapplicationcontext(),                             "no network connection", toast.length_long).show();                 } }   private void loadfeed()      {          arraylist<namevaluepair> postparameters = new arraylist<namevaluepair>();         postparameters.add(new basicnamevaluepair("val1",value1));         postparameters.add(new basicnamevaluepair("val2",value2));           try {             response = customhttpclient                     .executehttppost(                             "http://....................../file.php",                             postparameters);             system.out.println("the ultimate response" + response);         }          catch (exception e) {              server = false;             e.printstacktrace();         }      }      private boolean havenetworkconnection() {         boolean haveconnectedwifi = false;         boolean haveconnectedmobile = false;          connectivitymanager cm = (connectivitymanager) getsystemservice(context.connectivity_service);         networkinfo[] netinfo = cm.getallnetworkinfo();         (networkinfo ni : netinfo) {             if (ni.gettypename().equalsignorecase("wifi"))                 if (ni.isconnected())                     haveconnectedwifi = true;             if (ni.gettypename().equalsignorecase("mobile"))                 if (ni.isconnected())                     haveconnectedmobile = true;         }         return haveconnectedwifi || haveconnectedmobile;     }      private class longoperation1 extends asynctask<string, void, string> {          @override         protected string doinbackground(string... params) {              loadfeed();             return "executed";         }          @override         protected void onpostexecute(string result) {             dialog1.dismiss();             try {                  if (server) {                           toast.maketext(getapplicationcontext(),                             "success", toast.length_long).show();                     } else {                     toast.maketext(getapplicationcontext(),                             "try again", toast.length_long).show();                  }             }              catch (exception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }          }          @override         protected void onpreexecute() {             dialog1 = progressdialog.show(reuse.this, "please wait...",                     "retrieving data ...", true);         }          @override         protected void onprogressupdate(void... values) {         }     } 


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