private void createBottomSelectionBar() {
        flBottomSelectionBar = new FrameLayout(getContext());
//        flBottomSelectionBar.setLayoutTransition(new LayoutTransition());
        flBottomSelectionBar.setId(View.generateViewId());
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        params.addRule(RelativeLayout.BELOW, rvMonths.getId());
        flBottomSelectionBar.setLayoutParams(params);
        flBottomSelectionBar.setBackgroundResource(R.drawable.border_top_bottom);
        flBottomSelectionBar.setVisibility(settingsManager.getCalendarOrientation() == OrientationHelper.HORIZONTAL ? View.VISIBLE : View.GONE);
        addView(flBottomSelectionBar);

        createMultipleSelectionBarRecycler();
        createRangeSelectionLayout();
    }
Creates bottom selection bar to show selected days
cosmocalendar/src/main/java/com/applikeysolutions/cosmocalendar/view/CalendarView.java