public class TabsFragment extends Fragment implements OnTabChangeListener {

         private String month = "month";
         private String day = "day";

        private View mRoot;
        private TabHost tabHost;
        private int mCurrentTab;

        private Resources ressources = getResources();


        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            mRoot = inflater.inflate(R.layout.tabs_fragment, null);
            tabHost = (TabHost) mRoot.findViewById(android.R.id.tabhost);
            setupTabs();
            return mRoot;
        }

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            setRetainInstance(true);

            tabHost.setOnTabChangedListener(this);
            tabHost.setCurrentTab(mCurrentTab);

            updateTab(month, R.id.tab_1);
        }

        private void setupTabs() {
            tabHost.setup(); // you must call this before adding your tabs!
            tabHost.addTab(newTab(month));
            tabHost.addTab(newTab(day));
        }

        private TabSpec newTab(String tag) {
            View indicator = LayoutInflater.from(getActivity()).inflate(R.layout.tabs,(ViewGroup) mRoot.findViewById(android.R.id.tabs), false);


            Intent intentMonth = new Intent().setClass(getActivity(), MonthView.class);
            TabSpec tabSpec = tabHost.newTabSpec(tag).setContent(intentMonth).setIndicator(indicator);

             return tabSpec;
        }



         public void onTabChanged(String tabId) {

              if (month.equals(tabId)) {
                  updateTab(tabId, R.id.tab_1);
                  mCurrentTab = 0;
                  return;
         }
              if (day.equals(tabId)) {
                   updateTab(tabId, R.id.tab_2);
                   mCurrentTab = 1;
                   return;
               }
         }

         private void updateTab(String tabId, int placeholder) {
                FragmentManager fm = getFragmentManager();
                if (fm.findFragmentByTag(tabId) == null) {
                       fm.beginTransaction().replace(placeholder, new TabsFragment(), tabId).commit();
                 }
         }
  }

public class MonthView extends Activity implements OnClickListener {
   ...
 }


  public class DayView extends Activity {
      ...
  }