ActionBar.Tab without ViewPager

public class MainActivity extends Activity {
    private ActionBar actionBar;

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

        actionBar = getActionBar(); // 提示getActionBar方法一定在setContentView后面
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        actionBar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);

        Fragment navFragment = new NavFragment();
        actionBar.addTab(actionBar.newTab().setText("Nav")
                .setTabListener(new MyTabListener(navFragment)));

        Fragment contentFragment = new ContentFragment();
        actionBar.addTab(actionBar.newTab().setText("content")
                .setTabListener(new MyTabListener(contentFragment)));
    }

    private class MyTabListener implements ActionBar.TabListener {
        private Fragment mFragment;

        public MyTabListener(Fragment fragment) {
            mFragment = fragment;
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            ft.add(R.id.framelayout, mFragment, null);
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            ft.remove(mFragment);
        }

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