adapter class


  public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        TextView dayView;

        if (convertView == null) { // if it's not recycled, initialize some
            // attributes
            LayoutInflater vi = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
           v = vi.inflate(R.layout.calendar_item, null);

        }
        dayView = (TextView) v.findViewById(R.id.date);
        // separates daystring into parts.
        String[] separatedTime = dayString.get(position).split("-");
        // taking last part of date. ie; 2 from 2012-12-02
        String gridvalue = separatedTime[2].replaceFirst("^0*", "");
        // checking whether the day is in current month or not.
        if ((Integer.parseInt(gridvalue) > 1) && (position < firstDay)) {
            // setting offdays to white color.
            dayView.setTextColor(Color.WHITE);
            dayView.setClickable(false);
            dayView.setFocusable(false);
        } else if ((Integer.parseInt(gridvalue) < 7) && (position > 28)) {
            dayView.setTextColor(Color.WHITE);
            dayView.setClickable(false);
            dayView.setFocusable(false);
        } else {
            // setting curent month's days in black color.
            dayView.setTextColor(Color.BLACK);
        }

        if (dayString.get(position).equals(curentDateString)) {
            setSelected(v);
            previousView = v;
        } else {
            v.setBackgroundResource(R.drawable.list_item_background);
            //  v.setBackgroundResource(Integer.parseInt("#64DD17"));
        }
        dayView.setText(gridvalue);

        // create date string for comparison
        String date = dayString.get(position);

        if (date.length() == 1) {
            date = "0" + date;
        }
        String monthStr = "" + (month.get(GregorianCalendar.MONTH) + 1);
        if (monthStr.length() == 1) {
            monthStr = "0" + monthStr;
        }
        if((position==0 || position==7 || position==14 || position==21 || position==28 || position==35)) {
            dayView.setTextColor(Color.RED);
        }

        // show icon if date is not empty and it exists in the items array
        ImageView iw = (ImageView) v.findViewById(R.id.date_icon);
        //iw.setBackgroundResource(R.drawable.calendar_cel_select3);
        iw.setImageResource(R.drawable.calendar_cel_select3);
        //textView2= (TextView) v.findViewById(R.id.evntnm);
        textView= (TextView) v.findViewById(R.id.date);
       // ViewGroup viewGroup=(ViewGroup) v.getParent();

        if (date.length() > 0 && items != null && items.contains(date)) {
            iw.setVisibility(View.VISIBLE);

           // viewGroup.removeView(iw);
            v.setBackgroundColor(Color.parseColor("#00695C"));
            //textView2.setVisibility(View.VISIBLE);
            //textView.setBackgroundResource(R.drawable.calendar_cel_select3);
            //textView.setBackgroundResource(R.drawable.calendar_cel_select3);
//				textView.setBackgroundColor(Color.parseColor("#rrggbb"));
            textView.setVisibility(View.VISIBLE);
            textView.setDrawingCacheBackgroundColor(Color.parseColor("#1DE9B6"));
        } else {
           // viewGroup.addView(iw);
            iw.setVisibility(View.INVISIBLE);
            //textView2.setVisibility(View.INVISIBLE);
            textView.setVisibility(View.VISIBLE);
        }
        return v;
    }

    public View setSelected(View view) {
        if (previousView != null) {
            previousView.setBackgroundResource(R.drawable.list_item_background);
            //view.setBackgroundColor(Integer.parseInt("#64DD17"));
            //view.setBackgroundResource(R.drawable.calendar_cel_select3);
        }
        previousView = view;
        view.setBackgroundResource(R.color.colorPrimary);
        return view;
    }
mainactivity adding to arraylist
  public Runnable calendarUpdater = new Runnable() {
            DataDisplayActivity dataDisplayActivity=new DataDisplayActivity();

            @Override
            public void run() {
                items.clear();

                // Print dates of the current week
                DateFormat df = new SimpleDateFormat("yyyy-MM-dd",Locale.US);
                String itemvalue;
                for (int i = 0; i < 7; i++) {
                    itemvalue = df.format(itemmonth.getTime());
                    itemmonth.add(GregorianCalendar.DATE, 1);
                 items.add("2016-05-03");

 adapter.setItems(items);
                adapter.notifyDataSetChanged();
}

retriving data

  try {
                    JSONArray jsonArray = new JSONArray(data);
                    for(int i=0;i<jsonArray.length();i++) {
                        JSONObject jsonObject = jsonArray.getJSONObject(i);
                        date = jsonObject.getString("startdt");
                        String toTime = jsonObject.getString("enddt");
                   /* String fromTime = jsonObject.getString("");
                    String seats = jsonObject.getString("");
                    String venue = jsonObject.getString("");
                    String address = jsonObject.getString("");*/
                        data += "Node"+i+" : \n id= "+ date +" \n Name= "+ toTime +"" ;

                        textView1.setText(date);
                        textView2.setText(toTime);
                    }
                    if(data!=null && data.equals(CalendarAdapter.getMaxP())) {
                       {
                         CalendarAdapter.dayString.add(date);

                        }