private void initializeFragment() {
    TvShowFragment tvShowFragment =
        (TvShowFragment) getSupportFragmentManager().findFragmentById(R.id.f_tv_show);
    tvShowFragment.showTvShow(tvShowId);
  }
Propagates the tv show identifier to the fragment.
app/src/main/java/com/github/pedrovgs/effectiveandroidui/ui/activity/TvShowActivity.java