public class TabsAdapter extends FragmentPagerAdapter implements
		      ActionBar.TabListener, ViewPager.OnPageChangeListener {
	private final Context mContext;
	private final ActionBar mActionBar;
	private final MyViewPager mViewPager;
	private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
	public int curItem=0;

	final class TabInfo {
	    private final Class<?> clss;
	    private final Bundle args;

	    TabInfo(Class<?> _class, Bundle _args) {
		clss = _class;
		args = _args;
	    }
	}

	public TabsAdapter(SherlockFragmentActivity activity, MyViewPager pager) {
	    super(activity.getSupportFragmentManager());
	    mContext = activity;
	    mActionBar = activity.getSupportActionBar();
	    mViewPager = pager;
	    mViewPager.setAdapter(this);
	    mViewPager.setOnPageChangeListener(this);
	}

	public void addTab(Tab tab, Class<?> clss, Bundle args) {
	    TabInfo info = new TabInfo(clss, args);
	    tab.setTag(info);
	    tab.setTabListener(this);
	    mTabs.add(info);
	    mActionBar.addTab(tab);
	    notifyDataSetChanged();
	}

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

	@Override
	public Fragment getItem(int position) {
	    TabInfo info = mTabs.get(position);
	    Fragment ret = Fragment.instantiate(mContext, info.clss.getName(), info.args);
	    return ret;
	}

	@Override
	public void onPageScrolled(int position, float positionOffset,
				       int positionOffsetPixels) {
	}

	@Override
	    public void onPageSelected(int position) {
	    curItem = position;
	    Log.e("calc", "onPageSelected");
	    mActionBar.setSelectedNavigationItem(position);
	    mViewPager.setSwipeEnabled(position != 2);
	}

	@Override
	    public void onPageScrollStateChanged(int state) {
	}

	@Override
	    public void onTabSelected(Tab tab, FragmentTransaction ft) {
	    Object tag = tab.getTag();
	    for (int i = 0; i < mTabs.size(); i++) {
		if (mTabs.get(i) == tag) {
		    Log.e("calc", "onTabSelected");
		    mViewPager.setCurrentItem(i);
		    mViewPager.setSwipeEnabled(i != 2);
		}
	    }
	}

	@Override
	    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
	}

	@Override
	    public void onTabReselected(Tab tab, FragmentTransaction ft) {
	}
    }