android - cancelling AsyncTask and it's progressbar from a handler -


i want cancel asynctask sends data server after period of few seconds. i've got asynctask , handler set progress dialog still spins. how can cleanly stop asynctask quick possible. have far. in advance.

private class asyncpostdata extends asynctask<string, void, string> {      progressdialog progressdialog;     string datetimescanned;      @override     protected void onpreexecute()     {          // progressdialog= progressdialog.show(nfcscanneractivity.this,              //  "connecting server"," posting data...", true);           int buildversionsdk = build.version.sdk_int;         int buildversioncodes = build.version_codes.gingerbread;          log.e(tag, "buildversionsdk = " + buildversionsdk                  + "buildversioncodes = " + buildversioncodes);          int themeversion;         if (build.version.sdk_int > build.version_codes.gingerbread) {               themeversion = 2;          }else{               themeversion = 1;         }          progressdialog = new progressdialog(nfcscanneractivity.this, themeversion);         progressdialog.settitle("connecting server");         progressdialog.setmessage(" sending data server...");         progressdialog.setindeterminate(true);          try{         progressdialog.show();         }catch(exception e){              //ignore         }     };         @override     protected string doinbackground(string... params) {          log.e(tag, "carerid in doinbackground = " + params[3] + " datetimescanned in asyncpost duplecate tx = " + params[4]);          datetimescanned = params[4];          return nfcscannerapplication.loginwebservice.postdata(params[0], params[1], params[2], params[3], params[4],                 params[5], params[6], params[7] + getversionname(), params[8], params[9]);      }       @override         protected void onpostexecute(string result)         {          super.onpostexecute(result);              try{             progressdialog.dismiss();             }catch(exception e){                 //ignore             }              if( result != null && result.trim().equalsignorecase("ok")  ){                  log.e(tag, "about update db servertime");                 datetime senttoserverat = new datetime();                 nfcscannerapplication.loginvalidate.updatetransactionwithservertime(senttoserverat,null);                 nfcscannerapplication.loginvalidate.insertintoduplicatetransactions(datetimescanned);                  tagid = null;                 tagtype = null;                 tagclientid = null;                  //called refresh unsent transactions textview                 onresume();              }else if(result != null && result.trim().equalsignorecase("error: tx duplicated")){                 log.e(tag, "response server duplicate transaction ");                   //nb. following time may not correspond time on server                 //because tx has been processed 'ok' never reached phone,                 //so going update phone's db duptx time phone doesn't keep                  //sending it.                  datetime senttoservertimewhenduptx = new datetime();                 nfcscannerapplication.loginvalidate.updatetransactionwithservertime(senttoservertimewhenduptx,null);                  tagid = null;                 tagtype = null;                 tagclientid = null;                }else{                  toast.maketext(nfcscanneractivity.this,                         "no phone signal or server problem",                         toast.length_long).show();             }         }  }//end of asyncpostdata

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public void inithandlercancelasyncpost(){      cancelasyncposthandler = new handler();       cancelasyncpostrunnable = new runnable() {             public void run() {                  cancelasyncpost();              }              private void cancelasyncpost() {                  apd.cancel(true);              }         };      }

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public void sendtransactiontowebservice(string statusforwbservice){            inithandlercancelasyncpost();         cancelasyncposthandler.postdelayed(cancelasyncpostrunnable, 8 * 1000);          string[] params = new string[]{compid, tagid, tagclientid, carerid,                 formattedtagscantime, formattednowtime, statusforwbservice, getdevicename(), taglatitude, taglongitude};          apd = new asyncpostdata();         apd.execute(params);      }


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