.......
        try {
              pagerAdapter = new TFragmentPagerAdapter(getFragmentManager());
        } catch (Exception e) {
            Log.e(LOG_TAG, e.toString());
        }

..................

 private class TFragmentPagerAdapter extends FragmentPagerAdapter {

        public TFragmentPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {

            Fragment fragment = null;
            switch (training) {
                case VAR:
//                    fragment = getTFragment(position);
                    fragment = null;
                    break;
                default:
                    break;
            }

            if (fragment == null) {
                throw new RuntimeException();
            }

            return fragment;
        }
}