[android-developers] Problem with fragments

Hello!

I'm a newbie in software development for android. In my simple program I'm trying to add a new fragment into the main activity during run-time. And here is the place where problems come - the fragment doesn't appear at all.

Here is the code from the main activity: 

public class MainActivity extends FragmentActivity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.container_calendar);

        

        if(this.findViewById(R.layout.container_calendar) != null)

        {

        if(savedInstanceState != null)

        {

        return;

        }

       

        CalendarFragment calendar = new CalendarFragment();

        calendar.setArguments(getIntent().getExtras());

       

        FragmentTransaction transaction = this.getSupportFragmentManager().beginTransaction();

        transaction.add(R.id.calendar_container, calendar);

        transaction.commit();

        }

    }

}

And here is a fragment's code:

public class CalendarFragment extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)

{

return inflater.inflate(R.layout.calendar_layout, container, false);

}

}

So, as you can see, everything is simple and according to the manuals suppose to work just fine. But something is going wrong. The fragment container exists.

What's wrong with code? Why fragment doesn't appear onto the main activity?

Thanks in advance!

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