gps - Is LocationListener in android works like loop? -

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i used locationlistener calculate speed of moving mobile. used location.getspeed() speed. task if device speed crosses exceeds set speed limit send sms alert- on speed other mobile number. used flag variable boolean flag; check conditions. problem if mobile travel above limited speed 10 seconds continuously has send 1 message. app sends message long device goes above speed. set flag variable no use. code is

 private void sendoverspeedalert() {     toast.maketext(mainpage.this,"over speed alert set",toast.length_long).show();     final sharedpreferences account=getsharedpreferences("admins",mode_private);      string overspeed=account.getstring("osa", "");     double overspeedkm=double.parsedouble(overspeed);     final decimalformat dformat = new decimalformat("#");     string overspeedformat=dformat.format(overspeedkm);     final double overspeeddouble=double.parsedouble(overspeedformat);      final locationmanager locationmanager=(locationmanager)getsystemservice(context.location_service);     locationmanager.requestlocationupdates(locationmanager.gps_provider, 0, 0, new locationlistener() {         @override         public void onlocationchanged(final location location) {             final double currentspeed=(location.getspeed())*3.6;             string currentspeedstring =dformat.format(currentspeed);             final double currentspeeddouble=double.parsedouble(currentspeedstring);              if ((currentspeeddouble>=overspeeddouble)&&(flag==false)){                  countdowntimer countdowntimer=new countdowntimer(10000,1000) {                     @override                     public void ontick(long millisuntilfinished) {                      }                      @override                     public void onfinish() {                         double latitude=location.getlatitude();                         double longitude=location.getlongitude();                         decimalformat decimalformat=new decimalformat("#.####");                         date date=new date();                         simpledateformat sdf=new simpledateformat("kk:mm");                         string time=sdf.format(date);                          smsmanager smsmanager=smsmanager.getdefault();                         string sms="'alert- on speed'\n\n'!+"+decimalformat.format(latitude)+",+"+decimalformat.format(longitude)+","+time+"'\n\nspeed= '"+currentspeeddouble+"'km/hr('"+overspeeddouble+"')";                         smsmanager.sendtextmessage(logpreferences.getstring("admin1", ""), null, sms, null, null);                         flag=true;                     }                 }.start();             }               if (currentspeeddouble<20){                  flag=false;              }         }          @override         public void onstatuschanged(string provider, int status, bundle extras) {          }          @override         public void onproviderenabled(string provider) {          }          @override         public void onproviderdisabled(string provider) {          }     });

http://developer.android.com/reference/android/location/locationlistener.html

it called anytime device changes location. set falg, change value when send message, 10 sec after cross limit of speed. should change right after detecting it.


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