Passing data between Fragments in Android -

i know many have answered question, still cannot mine work. in startworkout class data chronometer, , since data in milliseconds use method coded called showelapsedtime(). convert milliseconds seconds,minutes, , hours. want pass data class called workouts, reason not working.i not getting data because nullpointerexecption

here code.

startworkout class

    package com.example.d_jara.apprunners;      public class startworkout extends fragment{       button button;     button button2;     chronometer mchronometer;     private int hours = 0;     private int minutes = 0;     private  int seconds=0;        @override     public view oncreateview( layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.lay_startworkout, container, false);             mchronometer = (chronometer) rootview.findviewbyid(r.id.chronometer);        // mchronometer.setformat("h:mm:ss");         button = (button) rootview.findviewbyid(r.id.mystart);         button.setonclicklistener(mstartlistener);         mchronometer.settextsize(70);              button2 = (button) rootview.findviewbyid(r.id.finishwork);         //button2.setonclicklistener(mfinishlistener);         //finish workout button          rootview.findviewbyid(r.id.finishwork).setvisibility(rootview.gone);           //test code here           button2.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                   mchronometer.stop();                 button.setvisibility(v.visible);                 button2.setvisibility(v.gone);                 toast toast = toast.maketext(getactivity().getbasecontext(),"your workout saved", toast.length_long);                 toast.show();                 toast.setgravity(gravity.center|gravity.center, 0, 0);                 showelapsedtime();                  int c= 9;                 bundle args = new bundle();                 fragment newfragment = new workouts();                 //number of calories                 args.putint("hours",hours);                 args.putint("seconds",seconds);                 args.putint("hours",hours);                 newfragment.setarguments(args);               }         });                return rootview;     }           view.onclicklistener mstartlistener = new view.onclicklistener() {         public void onclick(view v) {             mchronometer.setbase(systemclock.elapsedrealtime()-0);             mchronometer.start();             button.setvisibility(v.gone);             button2.setvisibility(v.visible);           }     };          private void showelapsedtime() {         long elapsedmillis = systemclock.elapsedrealtime() - mchronometer.getbase();          hours = (int) (elapsedmillis / 3600000);          minutes = (int) (elapsedmillis - hours * 3600000) / 60000;          seconds = (int) (elapsedmillis - hours * 3600000 - minutes * 60000) / 1000;             }     } 

and here workouts class

     public class workouts extends fragment {         @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.lay_workouts, container, false);                   int myseconds = getarguments().getint("seconds");             int myhours = getarguments().getint("hours");             int myminutes = getarguments().getint("minutes");                string se=string.valueof(myseconds);             string minu=string.valueof(myminutes);            string hours=string.valueof(myhours);              textview sec1 = (textview) rootview.findviewbyid(r.id.seconds);            textview minute1 = (textview) rootview.findviewbyid(r.id.minutes);            textview hours1 = (textview) rootview.findviewbyid(r.id.minutes);              sec1.settext(se);            minute1.settext(minu);         hours1.settext(hours);                     return  rootview;     }   } 

 bundle args = new bundle();             fragment newfragment = new workouts();             //number of calories             args.putint("hours",hours);             args.putint("seconds",seconds);             args.putint("hours",hours);             newfragment.setarguments(args); fragmenttransaction ft = getfragmentmanager().begintransaction(); ft.add(yourcontainerid, newfragment, "workout"); ft.commit();