hurr durr.java

    private void switchPage(final Class<? extends Fragment> fragmentClass) throws IllegalAccessException, InstantiationException {
        final FragmentManager fm = getSupportFragmentManager();
        final Fragment existingFragment = fm.findFragmentById(FragmentsID);

        if (existingFragment != null && existingFragment.getClass().equals(fragmentClass))
            return;

        final Fragment newFragment = fragmentClass.newInstance();

        final FragmentTransaction ft = fm.beginTransaction();
        if (existingFragment != null) {
            ft.replace(FragmentsID, newFragment);
        } else {
            ft.add(FragmentsID, newFragment);
        }
        ft.commit();
    }