方向改變與片段活動內viewPager

我試圖建立一個應用程序，顯示在縱向和橫向模式的書。所以顯然有1頁顯示在肖像和2景觀。每種模式的作品都不錯，但是當我將縱向從縱向改變爲橫向時，viewPager嘗試從縱向模式獲取2頁，而不是試圖從橫向模式獲取2張雙頁... 實際上FragmentStatePagerAdapter保留了2個以縱向創建的片段，並在爲橫向模式創建2個雙頁之前使用它們。如果我再次在肖像模式下切換，FragmentStatePagerAdapter使用之前在橫向模式下創建的2個片段，因此我再次看到1個雙頁而不是1個單頁等。如果我繼續切換方向，由於FragmentStatePagerAdapter從來沒有，我得到一個OutOfMemoryError在方向改變時沖洗它是碎片。方向改變與片段活動內viewPager

這裏有2用例更容易理解：

我在縱向模式下啓動viewPager
我看到第1頁確定
我刷到右，我看到第2頁確定
我刷卡向右，我看第3頁好
我將屏幕旋轉到風景模式
我看到第3頁錯誤
我刷到右，我看到第4頁錯誤
我刷到右，我看到第5和第6行
我在縱向模式下啓動viewPager
我看到第1頁確定
我滑動到右邊，我看到頁2 OK
我滑動到右邊，我看到頁3 OK
我滑動到右邊，我看到第4頁確定
我刷到右，我看到第5頁確定
我旋轉屏幕爲橫向模式
我見第5頁錯誤
我向左滑動，我看到第4頁錯誤

我刷到走了，我看行2頁和第3

public class PlayerFragmentActivity extends FragmentActivity { 
private Intent mIntent; 
private ViewPager mPortraitPager; 
private ViewPager mLandscapePager; 
private Boolean mIsLandscape; 
private String mKey; 
private int mNbPages; 
private int mNbDoublePages; 
private PageFactory mPageFactory; 
private DoublePageFactory mDoublePageFactory; 
private PagerAdapter mPagerAdapter; 

@Override 
protected void onStop(){ 
    super.onStop(); 
    mPagerAdapter = null; 
    mDoublePageFactory = null; 
    mPageFactory = null; 
} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.fragment_activity_player); 
    mIntent = getIntent(); 
    mKey = mIntent.getStringExtra("key"); 
    mNbPages = mIntent.getIntExtra("nbPages", 0); 
    mNbDoublePages = DoublePageFactory.getDoublePageNumFromPageNum(mNbPages); 

    Resources res = getResources(); 
    mIsLandscape = (res.getConfiguration().orientation == 1) ? false : true; 
    mPortraitPager = (ViewPager) findViewById(R.id.portraitPager); 
    mLandscapePager = (ViewPager) findViewById(R.id.landscapePager); 

    mPagerAdapter = new MyPagerAdapter(getSupportFragmentManager()); 

    if (mIsLandscape) { 
     mDoublePageFactory = new DoublePageFactory(this, mKey, mNbPages, res.getInteger(R.integer.nb_page_columns), res.getInteger(R.integer.nb_page_columns)); 
     mPortraitPager.setVisibility(View.GONE); 
     mLandscapePager.setAdapter(mPagerAdapter); 
     mPortraitPager.setAdapter(null); 
    } else { 
     mPageFactory = new PageFactory(this, mKey, this.mNbPages, res.getInteger(R.integer.nb_page_columns), res.getInteger(R.integer.nb_page_columns)); 
     mLandscapePager.setVisibility(View.GONE); 
     mPortraitPager.setAdapter(mPagerAdapter); 
     mLandscapePager.setAdapter(null); 
    } 
} 


public class MyPagerAdapter extends FragmentStatePagerAdapter { 

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

    @Override 
    public Fragment getItem(int position) { 
     Bundle args = new Bundle(); 
     if(mIsLandscape){ 
      Fragment doublePageFragment = new DoublePageFragment(); 
      args.putInt(DoublePageFragment.ARG_DOUBLEPAGE_NUM, position + 1); 
      doublePageFragment.setArguments(args); 
      return doublePageFragment; 
     }else{ 
      Fragment pageFragment = new PageFragment(); 
      args.putInt(PageFragment.ARG_PAGE_NUM, position + 1); 
      pageFragment.setArguments(args); 
      return pageFragment; 
     } 
    } 

    @Override 
    public int getCount() { 
     return (mIsLandscape) ? mNbDoublePages:mNbPages; 

    } 

      /* j'ai essayé cette méthode mais ça ne fonctionne pas :(*/ 
    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
      FragmentManager manager = ((Fragment) object).getFragmentManager(); 
      FragmentTransaction trans = manager.beginTransaction(); 
      trans.remove((Fragment) object); 
      trans.commit(); 

     super.destroyItem(container, position, object); 
    } 

    @Override 
    public int getItemPosition(Object object){ 
     return PagerAdapter.POSITION_NONE; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return "p." + position + 1; 
    } 
} 

public boolean isLandscape() { 
    return mIsLandscape; 
} 

public ImageView getSinglePage(int position) { 
    return mPageFactory.getPage(position); 
} 


public LinearLayout getDoublePage(int position) { 
    return mDoublePageFactory.getDoublePage(position); 
} 
} 


public class PageFragment extends Fragment {  
private PlayerFragmentActivity mPlayerFragmentActivity; 
public static final String ARG_PAGE_NUM = "page_number"; 
public static final String ARG_WOBOOK_DIRECTORY = "book_directory"; 
public static final String ARG_NB_PAGE_COLUMNS = "nb_page_columns"; 
public static final String ARG_NB_PAGE_ROWS = "nb_page_rows"; 

@Override 
public ImageView onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    mPlayerFragmentActivity = ((PlayerFragmentActivity) getActivity()); 
    return mPlayerFragmentActivity.getSinglePage(getArguments().getInt(ARG_PAGE_NUM)); 
} 

@Override 
public void onStop(){ 
    super.onStop(); 
    mPlayerFragmentActivity = null; 
}

}

public class DoublePageFragment extends Fragment { 
private PlayerFragmentActivity mPlayerFragmentActivity; 
public static final String ARG_DOUBLEPAGE_NUM = "double_page_number"; 
public static final String ARG_WOBOOK_DIRECTORY = "book_directory"; 
public static final String ARG_NB_PAGE_COLUMNS = "nb_page_columns"; 
public static final String ARG_NB_PAGE_ROWS = "nb_page_rows"; 

@Override 
public LinearLayout onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    mPlayerFragmentActivity = ((PlayerFragmentActivity) getActivity()); 
    return mPlayerFragmentActivity.getDoublePage(getArguments().getInt(ARG_DOUBLEPAGE_NUM)); 
} 

@Override 
public void onStop(){ 
    super.onStop(); 
    mPlayerFragmentActivity = null; 
} 
}

我讀過框架中的FragmentManager負責保存狀態並恢復尋呼機所做的任何活動片段。所以我想，當方向改變時，FragmentManager說

嘿！我已經有2項創建的，所以我並不需要製造新聞，讓讓他們

但實際上它從舊的定向模式的2項（頁/雙頁）。所以我需要找到一種方法來刪除FragmentManager在方向更改時保存的片段。

我也測試了this method。這個問題似乎涉及到this one

問候

來源

2013-02-28 popov130

你是怎麼解決這個問題的？ – Wayne 2014-04-18 06:03:00

-1

嘗試定向限制，以縱向或橫向mode.Because我們只能在精確模式下使用視圖尋呼機。

來源

2013-07-02 12:20:19

方向改變與片段活動內viewPager

回答

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