FragmentTransaction is not allowed to be added to back stack?

Question

why cant my fragments be added to back stack?

@Override
    public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {
        FragmentTransaction          


        

Answer 1

The only problem in your code is that you 'correctly' create a transaction, but then you never use it. The supplied transaction FragmentTransaction ft cannot be added to the backstack because it is not supported by the listener, however this should work:

@Override
    public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {

            ListFragment newListFragment = new ListFragment();
            Fragment newFragment = new EntryFrag();

            FragmentTransaction transaction = getFragmentManager().beginTransaction();
            transaction.replace(R.id.frameOne, newListFragment);
            transaction.replace(R.id.frameTwo, newFragment);


            transaction.addToBackStack(null);
            transaction.commit();
    }

Note the use of transaction.replace(... vice ft.replace(... also you must commit() this yourself, as you properly did, because TabListener will only auto-commit FragmentTransaction ft

Also, you can read about adding to the back stack not being supported in the TabListener API docs here: http://developer.android.com/reference/android/app/ActionBar.TabListener.html