MainActivity.java

public class MainActivity extends FragmentActivity implements ActionBar.TabListener {

    AppSectionsPagerAdapter mAppSectionsPagerAdapter;  
    ViewPager mViewPager;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

// Settare il tipo di navigazione
        mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager());
        final ActionBar actionBar = getActionBar();
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
 
        mViewPager = (ViewPager) 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 class AppSectionsPagerAdapter extends FragmentPagerAdapter {

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

// Il return new chiama le altre classi (i Fragment) 
        @Override
        public Fragment getItem(int i) {
            switch (i) {
                case 0:
                   
                    return new Sector1();
                case 1:
                    return new Sector2();

                default:
                    
                    Fragment fragment = new Sector1();
                    Bundle args = new Bundle();
                    
                    fragment.setArguments(args);
                    return fragment;
            }
        }

// Settare il titolo dei Sector

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

        public CharSequence getPageTitle(int position) {
    	    String tabLabel = null;
    	    switch (position) {
    	    
    	    case 0:
    		tabLabel = getString(R.string.sector1);
    		break;
    		
    	    case 1:
    		tabLabel = getString(R.string.sector2);
    		break;
    	   
    		
    	    }

    	    return tabLabel;
    	}
    }

Sector1.java

public class Sector1 extends Fragment
{

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.sector1, container, false);
            
...
           
            return rootView;
        }
    }

//Lo stesso codice è utilizzato su Sector2.java