Денис Загаевский

public View onCreateView(...) {
    final View root = super.onCreateView(...);
    root.findViewById(com.wdullaer.materialdatetimepicker.R.id.ok).setVisibility(View.GONE);
    root.findViewById(com.wdullaer.materialdatetimepicker.R.id.cancel).setVisibility(View.GONE);
    return root;
}

interface Item {
    Fragment getFragment()
}

class StepItemImpl implements Item {
    private StepsMenuItem data;
    StepItemImpl(StepsMenuItem data) {
        this.data = data;
    }
    @Override
    public Fragment getFragment() {
        return StepFragment.newInstance(data.getFileName());
    }
}

class WhatNextImpl implements Item {
    @Override
    public Fragment getFragment() {
        return WhatNextFragment.newInstance(...);
    }
}

List<Item> mItems;
...
    @Override
    public Fragment getItem(int position) {
        return mItems.get(position).getFragment();
    }
...
    @Override
    public int getCount() {
        return mItems.size()+1;
    }
/code>
Как-то так.