Question

In the Android API example FragmentTabs.java I see the following constructor code inside the TabListener class:

        // Check to see if we already have a fragment for this tab, probably
        // from a previously saved state.  If so, deactivate it, because our
        // initial state is that a tab isn't shown.
        mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
        if (mFragment != null && !mFragment.isDetached()) {
            FragmentTransaction ft = mActivity.getFragmentManager().beginTransaction();
            ft.detach(mFragment);
            ft.commit();
        }

Can someone please give me a hint under which circumstances the if clause can return true? I cannot think of such a situation. Thanks.

Answer 1

When you turn your phone from Portrait to Landscape or back.

The current active tab will not be detached.

I just tested it by putting a breakpoint in that clause.