public class MyTabActivity extends TabActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

  tabContext = this;

  setTitle("My App Name");

  final TabHost tabHost = getTabHost();

  tabHost.addTab(tabHost.newTabSpec(TAB_1).setIndicator(TAB_1, getResources().getDrawable(R.drawable.tab1)).setContent(new Intent(this, first.class)));

  tabHost.addTab(tabHost.newTabSpec(TAB_2).setIndicator(TAB_2, getResources().getDrawable(R.drawable.tab2)).setContent(new Intent(this, second.class)));

   tabHost.setOnTabChangedListener(new OnTabChangeListener() {

   public void onTabChanged(String tabId) {
             setTabTitle();

      }
   });

   tabHost.setCurrentTabByTag(TAB_1);
   }
}

public void setTabTitle()
{
    PrefManager prefManager = new PrefManager(getApplicationContext());
    String tabtitle = prefManager.getTitle();
    tabContext.setTitle("My App Name" + " " + tabtitle);
}

public static void setTabTitle(String title)
{
    tabContext.setTitle("My App Name" + " " + title);
}

MyTabActivity myTabs = (MyTabActivity) this.getParent();
    myTabs.setTitle("This is First cool Activity");