ActionBar BUG：使用SearchView后，列表模式导航不可见 [英] ActionBar BUG: List mode navigation not visible after using SearchView

问题描述

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

Bugreport b.android.com ： http：// code.google.com/p/android/issues/detail?id=51449

Bugreport on b.android.com : http://code.google.com/p/android/issues/detail?id=51449

我是目前面临ActionBar的一个问题。

I'm currently facing an issue with ActionBar.

让我们有一个ViewPager + PagerTitleStrip和3个碎片。

用户流程：

Let's have a ViewPager+PagerTitleStrip and 3 Fragments.
User flow:

• 打开申请


• First Fragment已将导航模式设为NAVIGATION_MODE_LIST
  
  
  
  
  • 其他片段有NAVIGATION_MODE_STANDARD
  
  

  仅添加MainActivity和布局代码该项目是标准的Android应用程序项目，minSdk 11，在创建主要活动时，选择空白活动并滑动视图+标题栏

  布局/活动_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;
          }
      }
  
  }
  

  
  

  推荐答案

  错误

  Bug

  我发布这个只是为了指向讨论的方向这个bug。

  I am posting this just to point the discussion in the direction of the bug.

  该错误与 SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW 标志更相关。删除标志后，一切都会完美运行。这很可能是一个错误，但我不确定是否有一个合理的解释。

  The bug is more related to the SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW flag. Once you remove the flag, everything will work perfectly. It is most probably a bug but once again I am not sure if there is a rational explanation.

  解决方案 （不是真的）

  Solution (not really)

  你正在 onCreateOptionsMenu 中创建菜单项，删除 ORed MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW

  When you're creating the menu item in onCreateOptionsMenu, remove the ORed MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW

  只需更改此

  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);
  

  到

  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);
  

  没有viewpager的错误

  Bug without viewpager

  我已经分叉了项目，这里没有viewpager具有相同的行为 ActionBar-Navigation-Bug

  I have forked the project and here it is without the viewpager with the same behaviour ActionBar-Navigation-Bug

  这篇关于ActionBar BUG：使用SearchView后，列表模式导航不可见的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！