android - Change Fragment layout on orientation change

Question

I have the following problem:

I have a TabActivity that shows a FragmentActivity in one of its tabs.

That FragmentActivity adds a ListFragment, when clicked on the item of that ListFragment, a Fragment is added (also to the backstack) and displayed.

Now I need to change the layout of that Fragment to change when going to landscape orientation.

But I'm totally clueless where to implement that change. I have already created to correct layout in the layout-land folder. But where is the correct point to set it?

Answer 1

Warning: this may be a pre-Lollipop answer.

A Fragment doesn't get re-inflated on configuration change, but you can achieve the effect as follows by creating it with a FrameLayout and (re)populating that manually:

public class MyFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle bundle) {
        FrameLayout frameLayout = new FrameLayout(getActivity());
        populateViewForOrientation(inflater, frameLayout);
        return frameLayout;
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        LayoutInflater inflater = LayoutInflater.from(getActivity());
        populateViewForOrientation(inflater, (ViewGroup) getView());
    }

    private void populateViewForOrientation(LayoutInflater inflater, ViewGroup viewGroup) {
        viewGroup.removeAllViewsInLayout();
        View subview = inflater.inflate(R.layout.my_fragment, viewGroup);

        // Find your buttons in subview, set up onclicks, set up callbacks to your parent fragment or activity here.
    }
}

I'm not particularly happy with the getActivity() and related calls here, but I don't think there's another way to get hold of those things.

Update: Removed cast of ViewGroup to FrameLayout and used LayoutInflater.from(), and the third parameter of inflate() instead of adding the view explicitly.