Android FragmentActivity not showing the action bar

Question

I'm trying to create an application that uses fragments, but when I try to show a Fragment in a FragmentActivity the action bar doesn't appear.

FragmentActivity class:

public class NoteDetailsActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.note_details_fragment);


        if (getResources().getConfiguration().orientation
                == Configuration.ORIENTATION_LANDSCAPE) {
            // If the screen is now in landscape mode, we can show the
            // dialog in-line with the list so we don't need this activity.
            finish();
            return;
        }

        if (savedInstanceState == null) {
            // During initial setup, plug in the details fragment.
            NoteDetailsFragment details = new NoteDetailsFragment();
            details.setArguments(getIntent().getExtras());
            getSupportFragmentManager().beginTransaction().add(R.id.note_details, details).commit();
        }
    }
}

Fragment class:

public class NoteDetailsFragment extends Fragment {
    /**
     * Create a new instance of DetailsFragment, initialized to
     * show the text at 'index'.
     */
    public static NoteDetailsFragment newInstance(int index) {
        NoteDetailsFragment f = new NoteDetailsFragment();

        // Supply index input as an argument.
        Bundle args = new Bundle();
        args.putInt("index", index);
        f.setArguments(args);

        return f;
    }

    public int getShownIndex() {
        return getArguments().getInt("index", 0);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        if (container == null) {
            // We have different layouts, and in one of them this
            // fragment's containing frame doesn't exist.  The fragment
            // may still be created from its saved state, but there is
            // no reason to try to create its view hierarchy because it
            // won't be displayed.  Note this is not needed -- we could
            // just run the code below, where we would create and return
            // the view hierarchy; it would just never be used.
            return null;
        }

        int index = getArguments().getInt("index");
        String message = "";
        switch (index) {
            case 0:
                message = "Start";
                break;
            case 1:
                message = "Second";
                break;
            case 2:
                message = "last";
                break;

        }

        TextView text = new TextView(getActivity());
        text.setText(message);
        return text;
    }
}

I have tried to implement the onCreateOptionsMenu in my FragmentActivity class but nothing happens. I've also tried to setHasOptionsMenu(true) in the Fragment class, but that doesn't do anything either.

If it's of interest, here's they layout where I insert my Fragment (note_details_fragment):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_margin="@dimen/activity_vertical_margin"
    android:layout_height="match_parent">

    <FrameLayout
        android:layout_above="@id/save_note"
        android:id="@+id/note_details"
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:background="?android:attr/detailsElementBackground" />

    <Button
        android:id="@+id/save_note"
        android:layout_alignParentBottom="true"
        android:text="@string/save"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

EDIT: From manifest:

    <activity android:name=".activities.NoteDetailsActivity">
    </activity>

Answer 1

Deriving from class ActionBarActivity instead of FragmentAcivity should solve your problem:

public class NoteDetailsActivity extends ActionBarActivity {
   // ...
}