CalendarView calendar;
public FragmentoPerfil() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    calendar = (CalendarView) getActivity().findViewById(R.id.calendarView);
    calendar.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
        @Override
        public void onSelectedDayChange(CalendarView view, int year, int month, int dayOfMonth) {
            // display the selected date by using a toast
            Toast.makeText(getActivity().getApplicationContext(), dayOfMonth + "/" + month + "/" + year, Toast.LENGTH_LONG).show();
        }
    });
    return inflater.inflate(R.layout.fragmento_perfil, container, false);
}

<CalendarView
    android:layout_width="match_parent"
    android:layout_height="371dp"
    android:id="@+id/calendarView"
    android:layout_weight="0.40" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/float_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

Fragment fragmentoGenerico = null;
    FragmentManager fragmentManager = getSupportFragmentManager();

    switch (itemDrawer.getItemId()) {

        case R.id.CALENDARIO:

            fragmentoGenerico = new FragmentoPerfil();


            break;

        case R.id.PRIMERO:
            fragmentoGenerico = new FragmentPrimero();
            break;

        case R.id.SEGUNDO:
            fragmentoGenerico = new FragmentSegundo();
            break;

        case R.id.TERCERO:
            fragmentoGenerico = new FragmentTercero();
            break;

        case R.id.CUARTO:
            fragmentoGenerico = new FragmentCuarto();
            break;

        case R.id.nav_share:
            Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
            sharingIntent.setType("text/plain");
            sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "AndroidSolved");
            sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "si que funciona");
            startActivity(Intent.createChooser(sharingIntent, "Share via"));
            break;


    }