[android-developers] FragmentActivity and TabHost - I'm not understanding anything

I've seen all the posts of TabHost + FragmentActivity on Google Groups and on StackOverflow and I'm still getting problems.

And I don't understand anything. 

I'm following this tutorial for TabHost and FragmentActivity: http://thepseudocoder.wordpress.com/2011/10/04/android-tabs-the-fragment-way/

I have the following thing:

in a tab I load a CategoriaFragment.class, where I load a ListView and I set a ListView.OnItemClickListener for it. When I click, I call this code:

CategoriaFragment fragmentnuevo = new CategoriaFragment();

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

        Bundle b = new Bundle();

        b.putBoolean("flagSottoCategorie", true);

        b.putSerializable("sottocategorielista", (Serializable)sottocategorielista);

   fragmentnuevo.setArguments(b);

transaction.addToBackStack(null);

        transaction.add(R.id.realtabcontent, fragmentnuevo, FragmentTAG); // FragmentTAG is the same tag that the current Fragment

        transaction.commit();

and yes, I call the same type of Fragment because I need the same recurses but with another List (sottocategorielista). This is not the error because I've tried to use another .class and it's the same error.

When I press back button, I get again my first ListView but listeners are not available. So I click and nothing happens. I've used add and replace as well.

Moreover, when I try to change Tab, if add is typed, I get several fragments in the same layout, if remove is typed, I get only one fragment on onTabChanged, but when I get back to my Fragment, nothing is available. Moreover if I press back button, I get the `java.IllegalStateException` saying 

> Fragment is already added: CategoriaFragment

What should I do?

Everything is easier with TabActivity, which is deprecated now and I would like to do everything with Fragments.

This is how my onTabChanged works (also available on the resource on the web)

    public void onTabChanged(String tag) {

        TabInfo newTab = this.mapTabInfo.get(tag);

        if (mLastTab != newTab) {

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

            if (mLastTab != null) {

                if (mLastTab.fragment != null) {

                    ft.detach(mLastTab.fragment);

                }

            }

            if (newTab != null) {

                if (newTab.fragment == null) {

                    newTab.fragment = Fragment.instantiate(this,

                            newTab.clss.getName(), newTab.args);

                    ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag);

                } else {

                    ft.attach(newTab.fragment);

                }

            }

 

            mLastTab = newTab;

            ft.commit();

            this.getSupportFragmentManager().executePendingTransactions();

        }

    }

Thanks in advance.

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