操作栏错误：使用搜索视图后列表模式导航不可见

演示此错误的项目：https://github.com/smarek/ActionBar-Navigation-Bug

b.android.com 上的错误报告 ： http://code.google.com/p/android/issues/detail?id=51449

我目前正面临 ActionBar 的问题。

让我们有一个ViewPager+PagerTitleStrip和3个片段。
用户流程：

• 打开应用程序
• 第一个片段已将导航模式设置为NAVIGATION_MODE_LIST
  • 其他片段有NAVIGATION_MODE_STANDARD
• “所有片段”都具有带有 SearchView 的选项菜单项
• 转到第二个或第三个并打开搜索（单击搜索项）
• 是否关闭搜索视图（您只需向后滑动到上一个片段）
• 转到第一个片段，看看，没有NAVIGATION_MODE_LIST
• 在第一个片段上打开搜索并关闭它
• 导航列表再次可见

仅添加MainActivity的代码和布局项目是标准的Android应用程序项目，minSdk 11，在创建主活动时，选择空白活动并滑动视图+标题条

布局/activity_main.xml

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <!--
    This title strip will display the currently visible page title, as well as the page
    titles for adjacent pages.
    -->

    <android.support.v4.view.PagerTitleStrip
        android:id="@+id/pager_title_strip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:background="#33b5e5"
        android:paddingBottom="4dp"
        android:paddingTop="4dp"
        android:textColor="#fff" />

</android.support.v4.view.ViewPager>

com/example/project/MainActivity.java

// imports ommited

public class MainActivity extends FragmentActivity {

    SectionsPagerAdapter mSectionsPagerAdapter;
    ViewPager mViewPager;

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

        mSectionsPagerAdapter = new SectionsPagerAdapter(
                getSupportFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

    }

    public static class DummySectionFragment extends Fragment {

        public static final String ARG_SECTION_NUMBER = "section_number";
        public static final int MENU_SEARCH = -1;
        protected MenuItem searchItem;
        protected SearchView mSearchView;

        public DummySectionFragment() {
            setHasOptionsMenu(true);
        }

        /*
        * Initializing menu items, adding only searchItem (aka SearchView in actionview)
        */
        @Override
        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
            mSearchView = new SearchView(getActivity().getActionBar()
                    .getThemedContext());
            searchItem = menu
                    .add(Menu.NONE, MENU_SEARCH, Menu.NONE, "Search")
                    .setIcon(android.R.drawable.ic_menu_search)
                    .setActionView(mSearchView)
                    .setShowAsActionFlags(
                            MenuItem.SHOW_AS_ACTION_ALWAYS
                                    | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
            super.onCreateOptionsMenu(menu, inflater);
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            TextView textView = new TextView(getActivity());
            textView.setGravity(Gravity.CENTER);
            textView.setText(Integer.toString(getArguments().getInt(
                    ARG_SECTION_NUMBER)));
            return textView;
        }

        // Using setUserVisibleHint to operate with actionbar
        // (navigation mode) and visibility of option menu items
        // if isVisibleToUser, we're doing setup for current Fragment
        @Override
        public void setUserVisibleHint(boolean isVisibleToUser) {
            super.setUserVisibleHint(isVisibleToUser);
            if (isVisibleToUser) {
                    // setting navigation mode according to fragment
                ActionBar ab = getActivity().getActionBar();
                int mode = 0;
                    // ARG_SECTION_NUMBER is argument with numbers 1, 2, 3
                switch (getArguments().getInt(ARG_SECTION_NUMBER)) {
                default:
                case 1:
                    mode = ActionBar.NAVIGATION_MODE_LIST;
                            // Simple adapter added to spinner, to be visible
                    ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
                            getActivity(),
                            android.R.layout.simple_spinner_dropdown_item,
                            new String[] { "A", "B", "C" });
                    ab.setListNavigationCallbacks(spinnerArrayAdapter,
                            new OnNavigationListener() {

                                @Override
                                public boolean onNavigationItemSelected(
                                        int itemPosition, long itemId) {
                                    return false;
                                }
                            });
                    break;
                case 2:
                case 3:
                    mode = ActionBar.NAVIGATION_MODE_STANDARD;
                    break;
                }
                getActivity().getActionBar().setNavigationMode(mode);
            } else {
                    // resetting navigation mode
                if (getActivity() != null
                        && getActivity().getActionBar() != null)
                    getActivity().getActionBar().setNavigationMode(
                            ActionBar.NAVIGATION_MODE_STANDARD);
            }
        }
    }

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return 3;
        }

        @Override
        public Fragment getItem(int position) {
            Fragment fragment = new DummySectionFragment();
            Bundle args = new Bundle();
            args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
            fragment.setArguments(args);
            return fragment;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
            case 0:
                return getString(R.string.title_section1).toUpperCase();
            case 1:
                return getString(R.string.title_section2).toUpperCase();
            case 2:
                return getString(R.string.title_section3).toUpperCase();
            }
            return null;
        }
    }

}