Android ActionBar usage (2)

3. Add Tag Tabs

The implementation tab in ActionBar can implement android. app. ActionBar. TabListener, and rewrite onTabSelected, onTabUnselected, and onTabReselected methods to associate Fragment. The Code is as follows:

Java code:

1. Private class MyTabListener implements ActionBar. TabListener {
2. Private TabContentFragment mFragment;
3. Public TabListener (TabContentFragment fragment ){
4. MFragment = fragment;
5. }
6. @ Override
7. Public void onTabSelected (Tab, FragmentTransaction ft ){
8. Ft. add (R. id. fragment_content, mFragment, null );
9. }
10. @ Override
11. Public void onTabUnselected (Tab, FragmentTransaction ft ){
12. Ft. remove (mFragment );
13. }
14. @ Override
15. Public void onTabReselected (Tab, FragmentTransaction ft ){
16. }
18. }

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Next we will create an ActionBar in the Activity. The Code is as follows:

Java code:

1. @ Override
2. Protected void onCreate (Bundle savedInstanceState ){
3. Super. onCreate (savedInstanceState );
4. SetContentView (R. layout. main );
5. Final ActionBar actionBar = getActionBar (); // The system prompts that the getActionBar method must be behind setContentView.
6. ActionBar. setNavigationMode (ActionBar. NAVIGATION_MODE_TABS );
7. ActionBar. setDisplayOptions (0, ActionBar. DISPLAY_SHOW_TITLE );
8. Fragment artistsfragment = new artistsfragment ();
9. Actionbar. addtab (actionbar. newtab (). settext (R. String. tab_artists). settablistener (New tablistener (artistsfragment )));
10. Fragment albumsfragment = new albumsfragment ();
11. Actionbar. addtab (actionbar. newtab (). settext (R. String. tab_albums). settablistener (New tablistener (albumsfragment )));
12. }

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4. Add drop-down navigation

Create a SpinnerAdapter and provide the Drop-down option. Unlike the Tab mode, you only need to modify the setNavigationMode mode and change ActionBar. NAVIGATION_MODE_TABS to ActionBar. NAVIGATION_MODE_LIST. The improved code is

Java code:

1. Actionbar = getactionbar ();
2. Actionbar. setnavigationmode (actionbar. navigation_mode_list );
3. Actionbar. setlistnavigationcallbacks (mspinneradapter, mnavigationcallback );

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The above code binds a SpinnerAdapter control through the setListNavigationCallbacks method. The specific OnNavigationListener code example is as follows:

Java code:

1. Monnavigationlistener = new onnavigationlistener (){
2. String [] strings = getresources (). getstringarray (R. array. action_list );
3. @ Override
4. Public boolean onNavigationItemSelected (int position, long itemId ){
5. ListContentFragment newFragment = new ListContentFragment ();
6. FragmentTransaction ft = openFragmentTransaction ();
7. Ft. replace (R. id. fragment_container, newFragment, strings [position]);
8. Ft. commit ();
9. Return true;
10. }
12. };

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The ListContentFragment code is

Java code:

1. Public class ListContentFragment extends Fragment {
2. Private String mText;
4. @ Override
5. Public void onAttach (Activity activity ){
6. Super. onAttach (activity );
7. MText = getTag ();
8. }
10. @ Override
11. Public View onCreateView (LayoutInflater inflater, ViewGroup container,
12. Bundle savedInstanceState ){
13. TextView text = new TextView (getActivity ());
14. Text. setText (mText );
15. Return text;
16. }
17. }

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