PreferenceFragment is shown transparently

Question

I'm trying to show a PreferenceFragment after I select the Preferences option in my ActionBar. However, after replacing current content with the PreferenceFragment you can see the old content below it. As in, you can see straight through the preferences.

Am I missing something here? I used an example from a book I own, which didn't use any layout files for the preferences. Do you need those?

Used code:

Actionbar menu

private boolean MenuChoice(MenuItem item) {
        switch (item.getItemId()) {
        case 0:
            FragmentManager fragmentManager = getFragmentManager();
            FragmentTransaction fragmentTransaction =
            fragmentManager.beginTransaction();
            ReaderPreferences prefs = new ReaderPreferences();
            fragmentTransaction.replace(android.R.id.content, prefs);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();
            return true;

        }
        return false;
    }

PreferenceReader

public class ReaderPreferences extends PreferenceFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // --load the preferences from an XML file---
        addPreferencesFromResource(R.xml.preference);
    }
  }

Actual result:

As you can see, you look straight through my preferences. What did I do wrong?

Answer 1

Eventually fixed it with a very easy fix.

I simply called the PreferenceFragment in a new Intent, and it worked perfectly.

For anyone with the same problem:

Prefs.java

public class ReaderPreferences extends PreferenceActivity {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            // --load the preferences from an XML file---
            addPreferencesFromResource(R.xml.preference);
        }

In my main screen when pressing a button:

Intent i = new Intent(this, Prefs.class);
            startActivity(i);

That's all. After setting the preferences simply press the back button and you're done.