戻るを押して再オープンしたときにフラグメントがビューページ内の状態を復元しない

Question

フラグメント内にビュー・ページャーを保持しようとしています。また、Viewポケベルには他の3つのフラグメントが含まれています。これは、ビューページャ

import android.support.v13.app.FragmentPagerAdapter; 
import android.support.v13.app.FragmentStatePagerAdapter; 
import android.support.v4.view.PagerAdapter; 
import android.support.v4.view.ViewPager; 

import com.android.browser1.UI.ComboViews; 


public class MyFragment extends Fragment implements 
     TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener, CombinedBookmarksCallbacks { 
    private TabHost mTabHost; 
    private ViewPager mViewPager; 
    public static final String EXTRA_COMBO_ARGS = "combo_args"; 
    Bundle bundle; 
    Bundle extra; 
    public static final String EXTRA_INITIAL_VIEW = "initial_view"; 
    public static BookmarkFragment bookmarkFragmentForPageA = null; 
    public static BookmarkFragment bookmarkFragmentForPageB = null; 
    Controller controller; 
    TabsAdapter mTabsAdapter; 
    FirstFragment first; 
    SecondFragment seconde; 
    ThirdFragment third; 

    public void setBundle(Bundle bundle) { 
     extra = bundle;// getActivity().getIntent().getExtras(); 
     this.bundle = extra.getBundle(EXTRA_COMBO_ARGS); 
    } 

    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     mTabHost.setup(); 
     mViewPager.setOffscreenPageLimit(2); 
     mTabsAdapter = new TabsAdapter(getActivity(), mTabHost, mViewPager); 

     new setAdapterTask().execute(); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.bookmark_view_pager, null); 
     mTabHost = (TabHost) view.findViewById(R.id.tabHost); 
     mViewPager = (ViewPager) view.findViewById(R.id.viewpager); 
     view.setBackgroundColor(Color.BLACK); 
     return view; 
    } 

    private class setAdapterTask extends AsyncTask<Void, Void, Void> { 
     protected Void doInBackground(Void... params) { 
      return null; 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      String bookmark = getResources().getString(R.string.tab_bookmarks); 
      String history = getResources().getString(R.string.tab_history); 
      String scrapmemo = getResources().getString(R.string.tab_snapshots); 
      mTabsAdapter.addTab(
        mTabHost.newTabSpec(bookmark).setIndicator(bookmark), BrowserBookmarksPage.class, null); 
      mTabsAdapter.addTab(
        mTabHost.newTabSpec(history).setIndicator(history), BrowserHistoryPage.class, null); 
      mTabsAdapter.addTab(
        mTabHost.newTabSpec(scrapmemo).setIndicator(scrapmemo), BrowserSnapshotPage.class, null); 
      String svStr = extra.getString(EXTRA_INITIAL_VIEW, null); 
      ComboViews startingView = svStr != null ? ComboViews.valueOf(svStr) 
        : ComboViews.Bookmarks; 
      switch (startingView) { 
      case Bookmarks: 
       mTabHost.setCurrentTab(0); 
       mViewPager.setCurrentItem(0); 
       break; 
      case History: 
       mTabHost.setCurrentTab(1); 
       mViewPager.setCurrentItem(1); 
       break; 
      case ScrapMemo: 
       mTabHost.setCurrentTab(2); 
       mViewPager.setCurrentItem(2); 
       break; 
      } 
     } 
    } 

    public void onTabChanged(String tag) { 
     ComboViews startingView = tag != null ? ComboViews.valueOf(tag) 
       : ComboViews.Bookmarks; 
     switch (startingView) { 
     case First: 
      mTabHost.setCurrentTab(0); 
      break; 
     case Second: 
      mTabHost.setCurrentTab(1); 
      break; 
     case Third: 
      mTabHost.setCurrentTab(2); 
      break; 
     } 
    } 

    @Override 
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
    } 

    @Override 
    public void onPageSelected(int position) { 
     this.mTabHost.setCurrentTab(position); 
    } 

    @Override 
    public void onPageScrollStateChanged(int state) { 
    } 

    public class TabsAdapter extends FragmentStatePagerAdapter 
      implements TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener { 
     private final Context mContext; 
     private final TabHost mTabHost; 
     private final ViewPager mViewPager; 
     private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>(); 

     final class TabInfo { 
      private final String tag; 
      private final Class clss; 
      private final Bundle args; 

      TabInfo(String _tag, Class _class, Bundle _args) { 
       tag = _tag; 
       clss = _class; 
       args = _args; 
      } 
     } 

     class DummyTabFactory implements TabHost.TabContentFactory { 
      private final Context mContext; 

      public DummyTabFactory(Context context) { 
       mContext = context; 
      } 

      @Override 
      public View createTabContent(String tag) { 
       View v = new View(mContext); 
       v.setMinimumWidth(0); 
       v.setMinimumHeight(0); 
       return v; 
      } 
     } 

     public TabsAdapter(Activity activity, TabHost tabHost, ViewPager pager) { 
      super(activity.getFragmentManager()); 
      mContext = activity; 
      mTabHost = tabHost; 
      mViewPager = pager; 
      mTabHost.setOnTabChangedListener(this); 
      mViewPager.setAdapter(this); 
      mViewPager.setOnPageChangeListener(this); 
      mViewPager.setOffscreenPageLimit(3); 
     } 

     public void addTab(TabHost.TabSpec tabSpec, Class clss, Bundle args) { 
      tabSpec.setContent(new DummyTabFactory(mContext)); 
      String tag = tabSpec.getTag(); 
      TabInfo info = new TabInfo(tag, clss, args); 
      mTabs.add(info); 
      mTabHost.addTab(tabSpec); 
      notifyDataSetChanged(); 
      getItem(0); 
     } 

     @Override 
     public int getCount() { 
      return mTabs.size(); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      Fragment fr = null; 
      TabInfo info = mTabs.get(position); 
      // Create a new fragment if necessary. 
      switch (position) { 
      case 0: 
       fr = new FirstFragment(); 
       fr.setArguments(info.args); 
       break; 
      case 1: 
       fr = new SecondFragment(); 
       fr.setArguments(info.args); 
       break; 
      case 2: 
       fr = new ThirdFragment(); 
       fr.setArguments(info.args); 
       break; 
      default: 
       fr = new FirstFragment(); 
       fr.setArguments(info.args); 
       break; 
      } 

      return fr; 
     } 

     @Override 
     public int getItemPosition(Object object) { 
      if (object instanceof FirstFragment 
        || object instanceof SecondFragment 
        || object instanceof ThirdFragment) 
       return POSITION_NONE; 
      return POSITION_UNCHANGED; 
     } 

     @Override 
     public void onTabChanged(String tabId) { 
      // called when the user clicks on a tab. 
      int position = mTabHost.getCurrentTab(); 
      mViewPager.setCurrentItem(position); 
     } 

     @Override 
     public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
     } 

     @Override 
     public void onPageSelected(int position) { 
      // Unfortunately when TabHost changes the current tab, it kindly 
      // also takes care of putting focus on it when not in touch mode. 
      // The jerk. 
      // This hack tries to prevent this from pulling focus out of our 
      // ViewPager. 
      TabWidget widget = mTabHost.getTabWidget(); 
      int oldFocusability = widget.getDescendantFocusability(); 
      widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); 
      mTabHost.setCurrentTab(position); 
      widget.setDescendantFocusability(oldFocusability); 
     } 

     @Override 
     public void onPageScrollStateChanged(int state) { 
     } 
    } 
} 

そして、私たちはスワイプしてすべての3つの断片を見ることができますが、バックプレスした後、我々はフラグメントを削除する最初の時間のための私の活動でこのフラグメントを添付が含まれているルート断片です。その後も、実行時に同じアクティビティでフラグメントをアタッチしますが、最初の2つのフラグメントのみが表示され、3番目のフラグメントのコンテンツは空です。

Answer 1

フラグメント内にビューページャーを保持しようとしています。また、Viewポケベルには他の3つのフラグメントが含まれています。

残念ながら、他の断片の断片はofficially not supported, as indicated by Dianne Hackborn, a core Android team memberです。