标签：android http java strong os art
本节主要讲解ActionBar如何添加Tabs标签和下拉导航。
一、添加标签 Tabs
在ActionBar中实现标签页可以实现android.app.ActionBar.TabListener ，重写onTabSelected、onTabUnselected和onTabReselected方法来关联Fragment。代码如下：
Java代码
- private class MyTabListener implements ActionBar.TabListener {
- private TabContentFragment mFragment;
- public TabListener(TabContentFragment fragment) {
- mFragment = fragment;
- } @Override
- public void onTabSelected(Tab tab, FragmentTransaction ft) {
- ft.add(R.id.fragment_content, mFragment, null);
- }
- @Override
- public void onTabUnselected(Tab tab, FragmentTransaction ft) {
- ft.remove(mFragment);
- }
- @Override
- public void onTabReselected(Tab tab, FragmentTransaction ft) {
- }
-
- }
接下来我们创建ActionBar在Activity中，代码如下：
Java代码
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- final ActionBar actionBar = getActionBar();
- actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
- actionBar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
- Fragment artistsFragment = new ArtistsFragment();
- actionBar.addTab(actionBar.newTab().setText(R.string.tab_artists).setTabListener(new TabListener(artistsFragment)));
- Fragment albumsFragment = new AlbumsFragment();
- actionBar.addTab(actionBar.newTab().setText(R.string.tab_albums).setTabListener(new TabListener(albumsFragment)));
- }
二、添加下拉导航 Drop-down Navigation
创建一个SpinnerAdapter提供下拉选项，和Tab方式不同的是Drop-down只需要修改下setNavigationMode的模式，将ActionBar.NAVIGATION_MODE_TABS改为ActionBar.NAVIGATION_MODE_LIST，最终改进后的代码为：
Java代码
- ActionBar actionBar = getActionBar();
- actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
- actionBar.setListNavigationCallbacks(mSpinnerAdapter, mNavigationCallback);
上面我们通过setListNavigationCallbacks方法绑定一个SpinnerAdapter控件，具体的OnNavigationListener代码示例为：
Java代码
- mOnNavigationListener = new OnNavigationListener() {
- String[] strings = getResources().getStringArray(R.array.action_list);
- @Override
- public boolean onNavigationItemSelected(int position, long itemId) {
- ListContentFragment newFragment = new ListContentFragment();
- FragmentTransaction ft = openFragmentTransaction();
- ft.replace(R.id.fragment_container, newFragment, strings[position]);
- ft.commit();
- return true;
- }
-
- };
而其中的ListContentFragment的代码为：
Java代码
- public class ListContentFragment extends Fragment {
- private String mText;
-
- @Override
- public void onAttach(Activity activity) {
- super.onAttach(activity);
- mText = getTag();
- }
-
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- TextView text = new TextView(getActivity());
- text.setText(mText);
- return text;
- }
- }
详解Android ActionBar之二：ActionBar添加Tabs标签和下拉导航,布布扣,bubuko.com
详解Android ActionBar之二：ActionBar添加Tabs标签和下拉导航
标签：android http java strong os art
原文地址：http://www.cnblogs.com/xiaochao1234/p/3822301.html
