onPostExecute() seems to be called only once

Issue

I've created class which extends AsyncTask, to synchronize with service. After synchro is finished I want to put the time (hh:mm) into TextView, to inform user, when synchro was made last time. I am doing it inside onPostExecute().
Problem is that this happens only once. TextView doesn't get updated later.
I'm prettey sure doInBackground() is being called because it takes quite a long time to synchronize just like when application starts (there is a lot of records), but I can't be 100% sure since data collection doesn't change at all.
That's my AsyncTask class:

private class Reconnect extends AsyncTask<String, Void, Void>{

        private RotateAnimation anim = new RotateAnimation(0f, 360f, Animation.RELATIVE_TO_SELF,0.5f, Animation.RELATIVE_TO_SELF,0.5f);

        @Override
        protected void onPreExecute() {
            rlRefresh.setEnabled(false);
            anim.setInterpolator(new LinearInterpolator());
            anim.setRepeatCount(Animation.INFINITE);
            anim.setDuration(700);
            refreshIV.startAnimation(anim);
        }



        @Override
        protected Void doInBackground(String... strings) {
            retrofit2.Call<List<ServiceTaskAxapta>> call = api.getTasks("1", strings[0]);
            retrofit2.Response<List<ServiceTaskAxapta>> response = null;
            try {
                response = call.execute();
            } catch (IOException e) {
                e.printStackTrace();
            }

            if(response.code() != 200){
                Toast.makeText(context, "Error 1", Toast.LENGTH_SHORT).show();
            } else {

                for (int i = 0; i < response.body().size(); i++){
                    String endTime = DateParser.increaseTimeString(response.body().get(i).getReportTime(), 8, 0, false, null, null, null);

                    allTasksDB.insertIntoDB(response.body().get(i).getTaskID(), "path", response.body().get(i).getStreet(), response.body().get(i).getCity(), response.body().get(i).getPhoneNumber(),
                            response.body().get(i).getCompanyName(), Integer.parseInt(response.body().get(i).getReportDay()), Integer.parseInt(response.body().get(i).getReportMonth()),
                            Integer.parseInt(response.body().get(i).getReportYear()), Integer.parseInt(response.body().get(i).getDeadlineDay()), Integer.parseInt(response.body().get(i).getDeadlineMonth()),
                            Integer.parseInt(response.body().get(i).getDeadlineYear()), response.body().get(i).getReportTime(), endTime);
                }

            }

            call = api.getTasks("2", strings[0]);
            response = null;
            try {
                response = call.execute();
            } catch (IOException e) {
                e.printStackTrace();
            }

            if(response.code() != 200){
                Toast.makeText(context, "Error 2", Toast.LENGTH_SHORT).show();
            } else {
                for (int i = 0; i < response.body().size(); i++){
                    String endTime = DateParser.increaseTimeString(response.body().get(i).getStartTimeMax(), 24, 0,false, null, null, null);

                    acceptedTasksDB.insertIntoDB(response.body().get(i).getTaskID(), "path", response.body().get(i).getStreet(), response.body().get(i).getCity(), response.body().get(i).getPhoneNumber(),
                            response.body().get(i).getCompanyName(), Integer.parseInt(response.body().get(i).getDeadlineDay()), Integer.parseInt(response.body().get(i).getDeadlineMonth()),
                            Integer.parseInt(response.body().get(i).getDeadlineYear()), Integer.parseInt(response.body().get(i).getAcceptedDay()), Integer.parseInt(response.body().get(i).getAcceptedMonth()),
                            Integer.parseInt(response.body().get(i).getAcceptedYear()), response.body().get(i).getStartTime(), endTime, response.body().get(i).getStartTimeMax(), false, false,
                            null, null);
                }
            }

            call = api.getTasks("3", strings[0]);
            response = null;
            try {
                response = call.execute();
            } catch (IOException e) {
                e.printStackTrace();
            }

            if(response.code() != 200){
                Toast.makeText(context, "Error 3", Toast.LENGTH_SHORT).show();
            } else {
                for (int i = 0; i < response.body().size(); i++){

                    acceptedTasksDB.insertIntoDB(response.body().get(i).getTaskID(), "path", response.body().get(i).getStreet(), response.body().get(i).getCity(), response.body().get(i).getPhoneNumber(),
                            response.body().get(i).getCompanyName(), Integer.parseInt(response.body().get(i).getDeadlineDay()), Integer.parseInt(response.body().get(i).getDeadlineMonth()),
                            Integer.parseInt(response.body().get(i).getDeadlineYear()), Integer.parseInt(response.body().get(i).getAcceptedDay()), Integer.parseInt(response.body().get(i).getAcceptedMonth()),
                            Integer.parseInt(response.body().get(i).getAcceptedYear()), response.body().get(i).getStartTime(), null, response.body().get(i).getStartTimeMax(), true, false,
                            null, null);
                }
            }

            call = api.getTasks("4", strings[0]);
            response = null;
            try {
                response = call.execute();
            } catch (IOException e) {
                e.printStackTrace();
            }

            if(response.code() != 200){
                Toast.makeText(context, "Error 4", Toast.LENGTH_SHORT).show();
            } else {
                for (int i = 0; i < response.body().size(); i++){

                    acceptedTasksDB.insertIntoDB(response.body().get(i).getTaskID(), "path", response.body().get(i).getStreet(), response.body().get(i).getCity(), response.body().get(i).getPhoneNumber(),
                            response.body().get(i).getCompanyName(), Integer.parseInt(response.body().get(i).getDeadlineDay()), Integer.parseInt(response.body().get(i).getDeadlineMonth()),
                            Integer.parseInt(response.body().get(i).getDeadlineYear()), Integer.parseInt(response.body().get(i).getAcceptedDay()), Integer.parseInt(response.body().get(i).getAcceptedMonth()),
                            Integer.parseInt(response.body().get(i).getAcceptedYear()), response.body().get(i).getStartTime(), null, response.body().get(i).getStartTimeMax(), true, true,
                            null, null);
                }
            }

            call = api.getTasks("5", strings[0]);
            response = null;
            try {
                response = call.execute();
            } catch (IOException e) {
                e.printStackTrace();
            }

            if(response.code() != 200){
                Toast.makeText(context, "Error 5", Toast.LENGTH_SHORT).show();
            } else {
                dbConnectionProblems.open();
                for (int i = 0; i < response.body().size(); i++){

                    acceptedTasksDB.insertIntoDB(response.body().get(i).getTaskID(), "path", response.body().get(i).getStreet(), response.body().get(i).getCity(), response.body().get(i).getPhoneNumber(),
                            response.body().get(i).getCompanyName(), Integer.parseInt(response.body().get(i).getDeadlineDay()), Integer.parseInt(response.body().get(i).getDeadlineMonth()),
                            Integer.parseInt(response.body().get(i).getDeadlineYear()), Integer.parseInt(response.body().get(i).getAcceptedDay()), Integer.parseInt(response.body().get(i).getAcceptedMonth()),
                            Integer.parseInt(response.body().get(i).getAcceptedYear()), response.body().get(i).getStartTime(), null, response.body().get(i).getStartTimeMax(), true, false,
                            null, null); 


                    dbConnectionProblems.insertIntoDB(response.body().get(i).getTaskID(), true, null, null, null, null);
                }
                dbConnectionProblems.close();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            if(!anim.hasEnded()){

                refreshIV.setAnimation(null);
            }
            String lastSynchro = calendar.get(Calendar.HOUR_OF_DAY) + ":" + calendar.get(Calendar.MINUTE) + "@" + calendar.get(Calendar.DAY_OF_MONTH) + "-" + (calendar.get(Calendar.MONTH)-1) + "-" + calendar.get(Calendar.YEAR);
            ProjectStuff.saveLastSynchro(lastSynchro, context);

            String synchroTime = "Last synchro: " + DateParser.parseTime(context, calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE));
            tvSynchroInfo.setText(synchroTime);
            rlRefresh.setEnabled(true);

        }
    }

And the execute() method:

rlRefresh.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Reconnect refreshEvent = new Reconnect();
                refreshEvent.execute("12");
            }
        });

After amount of time (needed to synchronize), amination stops, so it looks like onPostExecute() is called, and TextView is updated, but every later call doesn't update it.

Solution

Ok, I've found the problem. I called calendar = Calendar.getInstance() inside onCreate() method,
I should have done this in onPostExecute() right before saving it, and showing it inside TextView to get right time.

Answered By - SkypeDogg