How can I display a Dialog from a PreferenceFragment?

Question

I'm trying to bring up a DialogFragment when I tap a Preference in a PreferenceFragment. Unfortunately, when I call getFragmentManager() in DialogFragment.show() I receive the following error:

Cannot resolve method 'show(android.app.FragmentManager, java.lang.String)'

The problem is that I can't seem to refernece android.support.v4.app.FragmentManager from this fragment. The activity in charge of this fragment extends from FragmentActivity, but obviously that's not enough. I tried calling getSupportFragmentManager() as well, but that gave me this error:

Cannot resolve method 'getSupportFragmentManager()'

How can I make this work?

Here's some code:

gPrefAcknowledgements.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener()
{
    @Override
    public boolean onPreferenceClick(Preference preference)
    {
        DialogAcknowledgements dialogAck = new DialogAcknowledgements();
        dialogAck.show(getFragmentManager(), "acknowledgements");
        return true;
    }
});

Answer 1

Building on Steve's answer, I also need to set up the DialogFragment to import from android.app.DialogFragment (instead of android.support.v4.app.DialogFragment). The show() function in that library asks for an android.app.FragmentManager, which I can provide via a call to getFragmentManager() as I did within the code I posted in the question.

Answer 2

Try this:

dialogAck.show(getActivity().getFragmentManager(), "acknowledgements");

You can always call the Activity which holds the Fragment equal of which type it is.

EDIT:

I was wrong, the PreferenceFragment isn't included in the Support Library and is only available in Android 3.0 and higher. This post could help to deal with this scenario.