FragmentTabHost - No tab known for tag null

Question

Few days ago I implemented TabHostFramgent in a Fragment with a NavigationDrawer, and I faced with a problem that is the following err

Answer 1

There is another way to display tabs which can be used here.

Define TabHostFragment like this:

public class TabHostFragment extends Fragment implements ActionBar.TabListener{

    public TabHostFragment(){

    }

    AppSectionsPagerAdapter mAppSectionsPagerAdapter;
    ViewPager mViewPager;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.tab_host_test2, container, false);
        return rootView;
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState){
        mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getChildFragmentManager());

        final ActionBar actionBar = ((FragmentActivity)getActivity()).getSupportActionBar();

        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        mViewPager = (ViewPager) view.findViewById(R.id.pager);
        mViewPager.setAdapter(mAppSectionsPagerAdapter);
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {

            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });

        for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) {
            actionBar.addTab(
                actionBar.newTab()
                        .setText(mAppSectionsPagerAdapter.getPageTitle(i))
                        .setTabListener(this));
        }
    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    public static class AppSectionsPagerAdapter extends FragmentPagerAdapter {

        public AppSectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            Fragment f = null;
            switch (i) {
                case 0:
                    f = new MisOfertasFragment();
                    break;

                case 1:
                    f = new RecomendacionesFragment();
                    break;
            }

            return f;
        }

        @Override
        public int getCount() {
            return 2;
        }

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

        private String getFragmentTitle(int position){
            if(position == 0)
                return "Tab 1";
            else if(position == 1)
                return "Tab 2";
            else
                return "";
        }
    }
}

Define tab_host_test2.xml like this:

Rest of the code remains the same.

Try this. This should work.

EDIT:

Add this to the displayView() method:

if(position != 0)
    getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);