public static class TabListener<T extends Fragment> implements ActionBar.TabListener{        private Fragment mFragment;        private final Activity mActivity;        private final String mTag;        private final Class<T> mClass;        public TabListener(Activity activity, String tag, Class<T> clz) {            mActivity = activity;            mTag = tag;            mClass = clz;        }                @Override        public void onTabSelected(Tab tab, FragmentTransaction ft) {              if (mFragment == null) {                    // If not, instantiate and add it to the activity                    mFragment = Fragment.instantiate(mActivity, mClass.getName());                    ft.add(android.R.id.content, mFragment, mTag);                } else {                    ft.attach(mFragment);                }        }        @Override        public void onTabUnselected(Tab tab, FragmentTransaction ft) {            if (mFragment != null) {                ft.detach(mFragment);            }        }        @Override        public void onTabReselected(Tab tab, FragmentTransaction ft) {                    }            }

 1     protected void onCreate(Bundle savedInstanceState) { 2         super.onCreate(savedInstanceState); 3          4         ActionBar actionBar = getActionBar(); 5         actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 6         actionBar.setDisplayShowTitleEnabled(false); 7  8         Tab tab = actionBar.newTab() 9                            .setText("tab1")10                            .setTabListener(new TabListener<PlaceholderFragment>(11                                    this, "artist", PlaceholderFragment.class));12         actionBar.addTab(tab);13 14         tab = actionBar.newTab()15                        .setText("tab2")16                        .setTabListener(new TabListener<PlaceholderFragment>(17                                this, "album", PlaceholderFragment.class));18         actionBar.addTab(tab);19         20     }