title: Calendar and PagerAdapter - Unlimited Views
body: <p>In my activity, I'm using ViewPager to swipe left/right and show month view accordingly. I'm passing the month and year values from <code>onCreate</code> to the PagerAdapter:</p>
  
  <pre><code>private static int NUM_AWESOME_VIEWS = 3;
  
  viewPager = (ViewPager) v.findViewById(R.id.pager);
  cAdapter = new CalendarPagerAdapter(this.getActivity().getApplicationContext(), date_value, fragmentManager, month, year);
  viewPager.setAdapter(cAdapter);
  viewPager.setOffscreenPageLimit(3);
  </code></pre>
  
  <p>The Calendar starts from November and then scrolls till January. I would like the Calendar to display unlimited views forward and backward. </p>
  
  <p><strong>PagerAdapter:</strong></p>
  
  <pre><code>public CalendarPagerAdapter(Context context, int dv, FragmentManager fm, int month, int year){
      this.context = context;
      this.dv = dv;
      this.fm = fm;
      this.month = month;
      this.year = year;
  
  }
  
  public Object instantiateItem(View collection, int position) {
      Log.d("Object", "Instantiated");
      LayoutInflater inflater = (LayoutInflater) collection.getContext()
                       .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  
      View v =  inflater.inflate(R.layout.simple_calendar_view, null);
  
      _calendar.set(Calendar.MONTH, month);
      _calendar.set(Calendar.YEAR, year);
  
      month = _calendar.get(Calendar.MONTH) + 1;
      year = _calendar.get(Calendar.YEAR);
  
      currentMonth = (Button) v.findViewById(R.id.currentMonth);
      currentMonth.setText(hijri.getMonthForInt(month-1).toUpperCase() + " " + year);
  
      calendarView = (GridView) v.findViewById(R.id.calendar);
      calendarWeek = (GridView) v.findViewById(R.id.calendarweek);
  
      calendarWeek.setAdapter(new CalendarWeekAdapter(context, firstDay));
      // Initialised
      adapter = new GridCellAdapter(calendarView, context, R.id.calendar_day_gridcell, month, year, 0, 0, 0);
      adapter.notifyDataSetChanged();
      calendarView.setAdapter(adapter);
  
      ((ViewPager) collection).addView(v, 0);
  
      return v;
  }
  </code></pre>
  
  <p>Based on <a href="https://stackoverflow.com/questions/7440012/infinite-viewpager">Jon Willis' code</a>, this is what I have come up with, but when the position of the viewpager is 0 or 2, the page goes blank and then displays the next month + 1 (that is, after I scroll January, the page flickers and displays March). It does not scroll smoothly. I am not sure how else to do it. </p>
  
  <pre><code> viewPager.setOnPageChangeListener(new OnPageChangeListener() {
      @Override
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
  
      }
  
      @Override
      public void onPageScrollStateChanged(int state) {
              if (state == ViewPager.SCROLL_STATE_IDLE) 
  
                   Log.d("Calendar ViewPager", "Calendar ViewPager" + viewPager.getCurrentItem());
  
                      if (focusedPage == 0) {
  
                              _calendar.add(Calendar.MONTH, -1);
                              month = _calendar.get(Calendar.MONTH);
                              year = _calendar.get(Calendar.YEAR);
  
                              setGridCellAdapter(context, month, year);
  
                      } else if (focusedPage == 2) {
  
                             _calendar.add(Calendar.MONTH, +1);
                             month = _calendar.get(Calendar.MONTH);
                             year = _calendar.get(Calendar.YEAR);
  
  
                             setGridCellAdapter(context, month, year);
  
                      }
  
                      viewPager.setCurrentItem(1, false);
              }
      }
  
      @Override
      public void onPageSelected(int position) {
              focusedPage = position;
      }
  });
  
  
  
  public void setGridCellAdapter(Context ctx, int month, int year)
  {
      cAdapter = new CalendarPagerAdapter(ctx, date_value, fragmentManager, month, year);
      Log.d("Object", "Re-instantiatted" + month + year);
      cAdapter.notifyDataSetChanged();
      viewPager.setAdapter(cAdapter);
  
  }
  </code></pre>