Having Trouble with SharedPreferences topic

So.. I stayed up all night and finally got XSharedPreferences to work with my module. But today when I tried to add other elements such as a Navigation Drawer, and have the preference page only show when tapped, it stopped working.

This is the MainActivity code that has been working just fine.

Working:

Code:

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public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (savedInstanceState == null)
            getFragmentManager().beginTransaction().replace(android.R.id.content, new PrefsFragment()).commit();

    }

    public static class PrefsFragment extends PreferenceFragment {
        @SuppressWarnings("deprecation")
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            getPreferenceManager().setSharedPreferencesMode(MODE_WORLD_READABLE);
            addPreferencesFromResource(R.xml.prefs);
        }
    }
}

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Below is the code where it stopped working. I tried back tracking and only with the code above does it work.

Not working:

Code:

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public class MainActivity extends AppCompatActivity implements NavigationDrawerCallbacks {

    /**
    * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
    */
    private NavigationDrawerFragment mNavigationDrawerFragment;
    private Toolbar mToolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
        setSupportActionBar(mToolbar);

        mNavigationDrawerFragment = (NavigationDrawerFragment)
                getFragmentManager().findFragmentById(R.id.fragment_drawer);
        // Set up the drawer.
        mNavigationDrawerFragment.setup(R.id.fragment_drawer, (DrawerLayout) findViewById(R.id.drawer), mToolbar);
        // populate the navigation drawer
        mNavigationDrawerFragment.setUserData("John Doe", "johndoe@doe.com", BitmapFactory.decodeResource(getResources(), R.drawable.avatar));
    }

    @Override
    public void onNavigationDrawerItemSelected(int position) {
        Fragment fragment;
        switch (position) {
            case 0: //search//todo

                break;
            case 1: //Minor theme fixes
                    fragment = getFragmentManager().findFragmentByTag(PrefsFragment.TAG);
                if (fragment == null) {
                    fragment = new PrefsFragment();
                }
                android.app.FragmentManager fragmentManager = getFragmentManager();
                fragmentManager.beginTransaction()
                    .replace(R.id.container, fragment, PrefsFragment.TAG)
                    .addToBackStack(null)
                    .commit();
                break;
            case 2: //Full themed apps
                    fragment = getFragmentManager().findFragmentByTag(PrefsFragment2.TAG_2);
                if (fragment == null) {
                    fragment = new PrefsFragment2();
                }
                android.app.FragmentManager fragmentManager1 = getFragmentManager();
                fragmentManager1.beginTransaction()
                    .replace(R.id.container, fragment, PrefsFragment2.TAG_2)
                    .addToBackStack(null)
                    .commit();
                break;
            case 3: //settings //todo
                break;
        }
    }

    @Override
    public void onBackPressed() {
        if (mNavigationDrawerFragment.isDrawerOpen())
            mNavigationDrawerFragment.closeDrawer();
        else
            super.onBackPressed();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (!mNavigationDrawerFragment.isDrawerOpen()) {
            // Only show items in the action bar relevant to this screen
            // if the drawer is not showing. Otherwise, let the drawer
            // decide what to show in the action bar.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            PrefsFragment fragment = new PrefsFragment();
            android.app.FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.container, fragment)
                    .addToBackStack(null)
                    .commit();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public static class PrefsFragment extends PreferenceFragment {

            private final static String TAG = "PrefsFragment";

        @SuppressWarnings("deprecation")
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            getPreferenceManager().setSharedPreferencesMode(MODE_WORLD_READABLE);
            addPreferencesFromResource(R.xml.prefs);
        }
    }

    public static class PrefsFragment2 extends PreferenceFragment {

            private final static String TAG_2 = "PrefsFragment2";

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.prefs2);
        }
    }
}

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