Android : Open Dialog in FragmentPagerAdapter

I am using a FragmentPagerAdapter to intialize the contents of a SlidingTabLayout. I don't want to open fragments on all of the tabs. Some of them will fire an intent and some will just open a dialog. How can I achieve this?

 @Override
    public Fragment getItem(int i) {
        switch (i) {
            case 0:
                return FirstFragment.init();
            case 1:
                return OpenDialog.init();
            case 2:
                return DUIFragment.init();
            case 3: 
                 Intent callIntent = new Intent(Intent.ACTION_DIAL);
                        callIntent.setData(Uri.parse("tel:" + number));
                        startActivity(callIntent);