Android odświeżanie ListView w klasie Fragment

adapter.notifyDataSetChanged();

private TabHost tabHost;
private ViewPager viewPager;
public MyFragmentPagerAdapter myViewPagerAdapter;

	class FakeContent implements TabContentFactory {
		private final Context mContext;

		public FakeContent(Context context) {
			mContext = context;
		}

		@Override
		public View createTabContent(String tag) {
			View v = new View(mContext);
			v.setMinimumHeight(0);
			v.setMinimumWidth(0);
			return v;
		}
	}

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.tabs_viewpager_layout);

		pobieranie_wartosci.start();
	//this starts Thread for updating data	

	        		
	     		
		
		// init tabhost
		this.initializeTabHost(savedInstanceState);

		// init ViewPager
		this.initializeViewPager();

	}
	

	
	

	private void initializeViewPager() {
		List<Fragment> fragments = new Vector<Fragment>();

		fragments.add(new Tab1Fragment());
		fragments.add(new Tab2Fragment());
		fragments.add(new Tab1Fragment());
		fragments.add(new Tab1Fragment());
		fragments.add(new Tab3Fragment());
		fragments.add(new Tab1Fragment());


		this.myViewPagerAdapter = new MyFragmentPagerAdapter(
				getSupportFragmentManager(), fragments);
		this.viewPager = (ViewPager) super.findViewById(R.id.viewPager);
		this.viewPager.setAdapter(this.myViewPagerAdapter);
		this.viewPager.setOnPageChangeListener(this);

		onRestart();

	@Override
	public void onTabChanged(String tabId) {
		int pos = this.tabHost.getCurrentTab();
		this.viewPager.setCurrentItem(pos);

		HorizontalScrollView hScrollView = (HorizontalScrollView) findViewById(R.id.hScrollView);
		View tabView = tabHost.getCurrentTabView();
		int scrollPos = tabView.getLeft()
				- (hScrollView.getWidth() - tabView.getWidth()) / 2;
		hScrollView.smoothScrollTo(scrollPos, 0);

	}

	@Override
	public void onPageScrollStateChanged(int arg0) {
	}

	@Override
	public void onPageScrolled(int arg0, float arg1, int arg2) {
	}

	@Override
	public void onPageSelected(int position) {
		this.tabHost.setCurrentTab(position);
	}
	


	}


 

Thread pobieranie_wartosci = new Thread()
{
	public void run()
	{
		while(true)
		{
			
			int r = zmienne.lista_moich_spolek.size()-1;
			for(int i =0; i<=r;i++){
				try 
				{
					zmienne.lista_moich_spolek.get(i).transformacja_ceny(new Cena().execute(zmienne.lista_moich_spolek.get(i).numer).get());
				} catch (InterruptedException e) 
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (ExecutionException e) 
				{
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
				

				zmienne.lista_moich_spolek.get(0).cena_kupna++;
				myViewPagerAdapter.notifyDataSetChanged();
				System.out.println("cena :" + zmienne.lista_moich_spolek.get(0).cena_kupna);
			}
			
		try {
			Thread.sleep(1500);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}	
		}
	}
	
};

public class MyFragmentPagerAdapter extends FragmentPagerAdapter {

	List<Fragment> fragments;

	public MyFragmentPagerAdapter(FragmentManager fm, List<Fragment> fragments) {
		super(fm);
		this.fragments = fragments;
	}

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

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

}

public class Tab2Fragment extends Fragment {


	private ArrayList<HashMap<String, String>> list;

	public static final String FIRST_COLUMN="First";
	public static final String SECOND_COLUMN="Second";
	public static final String THIRD_COLUMN="Third";
	public static final String FOURTH_COLUMN="Fourth";
	
	@Override
	public View onCreateView(LayoutInflater inflater,
			@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.spolki_portfel, container, false);


	    	final ListView listView=(ListView) v.findViewById(R.id.listView1);
	    	list=new ArrayList<HashMap<String,String>>();
	    	LayoutInflater inflater1 = getActivity().getLayoutInflater();
	    	View header = inflater1.inflate(R.layout.naglowek_wlasne_spolki, listView, false);
	    	listView.addHeaderView(header);
	    	

	    			
			ListViewAdapter adapter=new ListViewAdapter(getActivity(), list);
			listView.setAdapter(adapter);
			
		
	
		return v;
	}
	}

zmienne.lista_moich_spolek.get(i).transformacja_ceny(new Cena().execute(zmienne.lista_moich_spolek.get(i).numer).get());