public class ViewPagerAdapter extends FragmentPagerAdapter {

    private final List<Fragment> mFragments = new ArrayList<>();
    private final List<String> mFragmentsTitles = new ArrayList<>();

    public ViewPagerAdapter(final FragmentManager fragmentManager){
        super(fragmentManager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragments.get(position);
    }

    @Override
    public int getCount() {
        return mFragments.size();
    }

    public void addFragment(Fragment fragment, String title){
        mFragments.add(fragment);
        mFragmentsTitles.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position){
        return null;
    }
}