java - ConfigChanges 期间 ActionBar 的导航模式变化

Question

我正在使用 actionbarsherlock 的 ActionBar，第一次以横向或水平方向运行应用程序时，选项卡以 Tabs Mode 显示。将方向更改为纵向后，导航模式仍在 Tabs 中。第二次将方向更改为 horizo​​ntal 时，选项卡显示为 List 并且仅显示父项，其余项隐藏。我听说这是 Android 的一个错误，如果选项卡太多无法适应屏幕，系统会自动将导航模式更改为 list。但问题是我第一次加载应用程序时它甚至水平显示为 tabs 模式。顺便说一下，我创建了 100 个标签页。

此图像处于水平 View 中。从上数第一张图片是我将手机方向更改为纵向然后返回横向后的结果。

---

我的 list 文件中有这段代码，

android:configChanges="orientation|screenSize"

主要 Activity

 public void onConfigurationChanged(Configuration newConfig) {
         ActionBar ab = getSupportActionBar();
             ab.setDisplayShowTitleEnabled(false);

             if(ab.getNavigationMode() != ActionBar.NAVIGATION_MODE_TABS){
                 ab.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

             }
        super.onConfigurationChanged(newConfig);
}

只是为了确保我也把代码放在 setContentView

附近的某个地方

        final ActionBar ab = getSupportActionBar();
        ab.setDisplayShowTitleEnabled(false);
        ab.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

更新:

我处理 onConfigurationChanged 的原因是因为我遇到了一个空指针异常。

逻辑猫

08-05 15:36:18.486: E/AndroidRuntime(30044): FATAL EXCEPTION: main
08-05 15:36:18.486: E/AndroidRuntime(30044): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.actionbarsherlock.sample.styled/com.actionbarsherlock.sample.styled.MainActivity}: java.lang.NullPointerException
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3512)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread.access$700(ActivityThread.java:130)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1201)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.os.Looper.loop(Looper.java:137)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread.main(ActivityThread.java:4745)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at java.lang.reflect.Method.invokeNative(Native Method)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at java.lang.reflect.Method.invoke(Method.java:511)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at dalvik.system.NativeStart.main(Native Method)
08-05 15:36:18.486: E/AndroidRuntime(30044): Caused by: java.lang.NullPointerException
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.nineoldandroids.animation.PropertyValuesHolder.setupSetterAndGetter(PropertyValuesHolder.java:504)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.nineoldandroids.animation.ObjectAnimator.initAnimation(ObjectAnimator.java:410)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.nineoldandroids.animation.ValueAnimator.setCurrentPlayTime(ValueAnimator.java:538)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:928)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.nineoldandroids.animation.ValueAnimator.start(ValueAnimator.java:951)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.nineoldandroids.animation.ObjectAnimator.start(ObjectAnimator.java:385)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.actionbarsherlock.sample.styled.MainActivity.rotateLeftFrag(MainActivity.java:218)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.actionbarsherlock.sample.styled.MainActivity.onTabSelected(MainActivity.java:256)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.actionbarsherlock.internal.app.ActionBarWrapper$TabWrapper.onTabSelected(ActionBarWrapper.java:356)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.android.internal.app.ActionBarImpl.selectTab(ActionBarImpl.java:570)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.android.internal.app.ActionBarImpl.setSelectedNavigationItem(ActionBarImpl.java:356)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.android.internal.app.ActionBarImpl.setNavigationMode(ActionBarImpl.java:1158)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.actionbarsherlock.internal.app.ActionBarWrapper.setNavigationMode(ActionBarWrapper.java:216)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.actionbarsherlock.sample.styled.MainActivity.showTabsNav(MainActivity.java:244)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at com.actionbarsherlock.sample.styled.MainActivity.onCreate(MainActivity.java:82)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.Activity.performCreate(Activity.java:5008)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
08-05 15:36:18.486: E/AndroidRuntime(30044):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
08-05 15:36:18.486: E/AndroidRuntime(30044):    ... 12 more

Answer 1

这是 android 中选项卡的默认行为。如果在水平/纵向方向上没有更多空间供选项卡使用，那么它将转换为列表。

现在，如果您仍然希望所有选项卡不在列表中，那么我建议您查看 ViewPager 的示例之后，您应该将该 FragmentActivity 添加到您的 SherlockFragmentActivity 中。只需检查下面的示例代码，我在做什么，这将帮助您拥有任何方向的所有选项卡。

public class TestSampleTabDefault extends SherlockActivity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }
    @SuppressLint("NewApi")
    public static class SampleTabsDefault extends FragmentActivity implements ServiceConnection {
        private static final String[] CONTENT = new String[] { "Albums", "Artists", "Songs", "Playlist","Genre","Recently Played","Easy Transfer" };
        Handler mHandler;
        //Runnable mRunnable;
        private ServiceToken mToken;
        private IRemoteService  mIRemoteService;
        public static ViewPager pager;
        public static int index = 0;
        public static android.app.ActionBar mActionBar;


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

            //getSupportActionBar().setHomeButtonEnabled(true);
            //ActionBar bar = getSupportActionBar();
            //bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
            //bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);

            FragmentPagerAdapter adapter = new GoogleMusicAdapter(getSupportFragmentManager());

            pager = (ViewPager)findViewById(R.id.pager);
            pager.setAdapter(adapter);

            /*getSupportActionBar().setTitle(name);
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);*/

            TabPageIndicator indicator = (TabPageIndicator)findViewById(R.id.indicator);
            indicator.setViewPager(pager);

            index = getIntent().getExtras().getInt("index");
            if(index >0){
                indicator.setCurrentItem(index);
            }

        }

        class GoogleMusicAdapter extends FragmentPagerAdapter {
             private final FragmentManager mFragmentManager;
             private Fragment mFragmentAtPos0;
            public GoogleMusicAdapter(FragmentManager fm) {
                super(fm);
                mFragmentManager = fm;
            }
            @Override
            public Fragment getItem(int position) {
               // return TestFragment.newInstance(CONTENT[position % CONTENT.length]);
                Fragment fm = null;

                if(position==0){// LOAD ALBUMS
                    fm = ArtistList.ArtistListFragment.newInstance();
                    return fm;

                }else if(position==1){// LOAD ARTISTS
                    //Toast.makeText(getApplicationContext(), "Select Album", Toast.LENGTH_SHORT).show();
                    fm = ArtistList.ArtistListFragment.newInstance();
                    return fm;
                }else if(position==2){// LOAD SONGS
                    fm = SongsList.SongsListFragment.newInstance(); 
                    return fm;
                }else if(position==3){   // PLaylist
                    fm = PlaylistList.PlayListFragment.newInstance();
                    return fm;
                }else if(position==4){ // Genre List
                    fm = GenreList.GenreListFragment.newInstance();
                    return fm;
                }else if(position==5){ // Recent List
                    fm = RecentAddedList.RecentListFragment.newInstance();
                    return fm;
                }else{
                    fm = TestFragment.newInstance(CONTENT[position]);
                }
                return fm;


            }

            @Override
            public CharSequence getPageTitle(int position) {
                return CONTENT[position % CONTENT.length].toUpperCase();
            }

            @Override
            public int getCount() {
              return CONTENT.length;
            }

            @Override
            public int getItemPosition(Object object)
            {
                if (object instanceof AlbumListFragment && mFragmentAtPos0 instanceof TestFragment)
                    return POSITION_NONE;
                return POSITION_UNCHANGED;
            }

        }

    }
}

希望对您有所帮助。一切顺利。如果您在这方面遇到任何困难，请告诉我。