ViewView öğesinin iç kısmı getView() içinde dönen döndürücü()

Uygulamamda bir ViewPager'ım var ve bu ViewPager'ın içinde yaklaşık 17 Fragment var. Hem Portre hem de Manzara için düzenleri tasarladım. Ekranımı Döndürdüğümde, getView() yöntemini null nesnesine döndürdüğümde, bunun neden olduğunu bilmiyorum, setRetainInstance(true)'u kullandım, ama yine de aynı şey, adaptör uygulamam olarak PagerStateFragmentAdapter kullanıyorum.ViewView öğesinin iç kısmı getView() içinde dönen döndürücü()

Bu neden oluyor?

Önceden teşekkür ederiz.

DÜZENLEME

MainActivity

public class MainActivity extends FragmentActivity implements ViewPagerController{ 
    public static final String READ_TYPE = "Read_type"; 
    private static final String TAG = MainActivity.class.getSimpleName(); 
    private int mReadType; 
    private ViewPager mBookPager; 

    @Override 
    public void goToNextPage() { 
     // TODO Auto-generated method stub 
     int currentPage = mBookPager.getCurrentItem(); 
     if(currentPage+1 < mBookPager.getAdapter().getCount()){ 
      FragmentPagerAdapter adapter = (FragmentPagerAdapter)mBookPager.getAdapter(); 
      BookPageFragment bookPage = (BookPageFragment)adapter.getItem(currentPage); 
      bookPage.setCurrentPage(false); 

      bookPage = (BookPageFragment)adapter.getItem(currentPage+1); 
      bookPage.setCurrentPage(true); 
      mBookPager.setCurrentItem(currentPage+1, true); 
     } 
    } 

    @Override 
    public void goToPreviousPage() { 
     // TODO Auto-generated method stub 
     int currentPage = mBookPager.getCurrentItem(); 
     if(currentPage >= 0){ 
      mBookPager.setCurrentItem(currentPage-1,true); 
     } 
    } 

    @Override 
    public void onBackPressed() { 
     // TODO Auto-generated method stub 
     finish(); 
     overridePendingTransition(R.anim.anim_move_to_right,R.anim.anim_from_left_to_right); 
    } 

    @Override 
    protected void onDestroy() { 
     // TODO Auto-generated method stub 
     Log.i(TAG,"onDestroy"); 
     mBookPager.removeAllViews(); 
     mBookPager = null; 
     super.onDestroy(); 
    } 

    @Override 
    protected void onCreate(Bundle arg0) { 
     // TODO Auto-generated method stub 
     super.onCreate(arg0); 
     setContentView(R.layout.main_layout); 
     overridePendingTransition(R.anim.anim_from_right_to_left, R.anim.anim_move_to_left); 
     initReadType(); 
     mBookPager = (ViewPager)findViewById(R.id.mainLayout_mainViewPager); 
     initViewPager(); 

    } 

    private void initReadType(){ 
     mReadType = getIntent().getIntExtra(READ_TYPE, -1); 
    } 

    private void initViewPager(){ 
     BookPagerAdapter mPagerAdapter = new BookPagerAdapter(getSupportFragmentManager(),mReadType); 
     ((BookPageFragment)mPagerAdapter.getItem(0)).setCurrentPage(true); 
     mBookPager.setAdapter(mPagerAdapter); 
     mBookPager.setOnPageChangeListener(mOnPageChangeListener); 
    } 

    private OnPageChangeListener mOnPageChangeListener = new OnPageChangeListener(){ 

     @Override 
     public void onPageScrollStateChanged(int arg0) { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onPageScrolled(int arg0, float arg1, int arg2) { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onPageSelected(int selection) { 
      // TODO Auto-generated method stub 
      BookPagerAdapter bookAdapter = (BookPagerAdapter)mBookPager.getAdapter(); 
      BookPageFragment fragment = (BookPageFragment)bookAdapter.getItem(selection); 
      if(selection > 0){ 
       bookAdapter.getItem(selection - 1).onPause(); 
//    bookAdapter.getItem(selection - 1).onDestroy(); 
      } 
      if(selection + 1 < bookAdapter.getCount() && (bookAdapter.getItem(selection + 1) != null)){ 
       bookAdapter.getItem(selection + 1).onPause(); 
      } 
      fragment.setCurrentPage(true); 
      fragment.onResume(); 
     } 

    }; 

    public static class BookPagerAdapter extends FragmentStatePagerAdapter{ 
     private List<Fragment> mBookPagesList; 
     private int mReadType; 

     public BookPagerAdapter(FragmentManager fm,int readType) { 
      super(fm); 
      // TODO Auto-generated constructor stub 
      mReadType = readType; 
      initPages(); 
     } 

     @Override 
     public Fragment getItem(int position) { 
      // TODO Auto-generated method stub 
      return mBookPagesList.get(position); 
     } 

     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      return mBookPagesList.size(); 
     } 

     private void initPages(){ 
      mBookPagesList = new ArrayList<Fragment>(); 
      mBookPagesList.add(FirstPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(SecondPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(ThirdPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(FourthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(FifthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(SixthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(SeventhPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(EigthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(NinethPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(TenthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(EleventhPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(TwelvethPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(ThirteenthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(FourteenthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(FifteenthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(SixteenthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(SeventeenthPageFragment.newInstance(mReadType)); 
      mBookPagesList.add(CreditsPageFragment.newInstance(mReadType)); 
     } 
    } 
}

BookPageFragment

public abstract class BookPageFragment extends Fragment{ 
public static final String TAG = BookPageFragment.class.getSimpleName(); 

public static final int AUTO_PLAY = 1; 
public static final int READ_WITH_ME = 2; 
public static final int READ_TO_MYSELF = 3; 

private ViewPagerController mPageController; 
protected final static String READ_TYPE_KEY = "readType"; 

private boolean mIsCurrentPage; 

private int mCurrentWordIndex; 
private MediaPlayer mMediaPlayer; 
private BookPage mBookPage; 
private SpeechController mSpeechController; 

private TextHighlightController mCurrentHighlightController; 
protected List<TextHighlightController> mHighlighters; 
private int mCurrentHighlightIndex; 

public abstract int getJsonId(); 
public abstract int getAudioResourceId(); 
protected abstract int[] getParagraphsTextView(); 
protected abstract int[] getParagraphsStringRes(); 
protected abstract int[] getPopupButtonsId(); 

public BookPageFragment(){ 
    mIsCurrentPage = false; 
    mCurrentHighlightIndex = 0; 
} 

public void endAudioPlayback(){ 
    if(getReadTypeFromArgs() == AUTO_PLAY){ 
     mPageController.goToNextPage(); 
    } 
} 

private void loadHighlighters(){ 
    int[] paragraphsTextViews = getParagraphsTextView(); 
    int[] stringRes = getParagraphsStringRes(); 
    for(int i=0;i<paragraphsTextViews.length;i++){ 
     int currentParagraph = paragraphsTextViews[i]; 
     int stringId = stringRes[i]; 
     TextView paragraph = (TextView)getView().findViewById(currentParagraph); 
     TextHighlightController controller = TextHighlightController.newInstance(getActivity(), paragraph, stringId); 
     addHighlighter(controller); 
    } 
} 

public final void highlightNextWord(){ 
    if(!mCurrentHighlightController.highlightNextWord()){ 
     mCurrentHighlightIndex++; 
     if(mCurrentHighlightIndex < mHighlighters.size()){ 
      mCurrentHighlightController = mHighlighters.get(mCurrentHighlightIndex); 
      mCurrentHighlightController.highlightNextWord(); 
     } 
    } 
} 

@Override 
public void onAttach(Activity activity) { 
    // TODO Auto-generated method stub 
    super.onAttach(activity); 
    Log.i(TAG,"onAttach"); 
    try{ 
     mPageController = (ViewPagerController)activity; 
    }catch(ClassCastException e){ 
     throw new IllegalArgumentException("Activity not implementing ViewPagerController"); 
    } 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    Log.i(TAG,"onCreate"); 
} 

@Override 
public void onDetach() { 
    // TODO Auto-generated method stub 
    super.onDetach(); 
    resetAll(); 
    Log.i(TAG,"onDetach"); 
} 

public void goToNextPage(){ 
    mPageController.goToNextPage(); 
} 

public void goToPreviousPage(){ 
    mPageController.goToPreviousPage(); 
} 

public void setCurrentPage(boolean isCurrentPage){ 
    mIsCurrentPage = isCurrentPage; 
} 

public boolean isCurrentPage(){ 
    return mIsCurrentPage; 
} 

@Override 
public void onStart() { 
    // TODO Auto-generated method stub 
    super.onStart(); 
    Log.i(TAG,"onStart"); 
} 

@Override 
public void onResume() { 
    // TODO Auto-generated method stub 
    Log.i(TAG,"onResume"); 
    super.onResume(); 
    resetAll(); 
    configureBookPage(); 
} 

public final void startWithAutoPlay(){ 
    disablePopupButtons(); 
    initAudioPlayback(); 
} 

public final void startWithRead(){ 
    initAudioPlayback(); 
} 

private long prevWordStartTime = 0; 
public final long getNextWordStart(){ 
    long wordStart=-1; 
    if(mCurrentWordIndex < mBookPage.getWordList().size()){ 
     Word currentWord = mBookPage.getWordList().get(mCurrentWordIndex); 
     wordStart = currentWord.getStartTime() - prevWordStartTime; 
     wordStart = wordStart + currentWord.getWordLength() - 25; 
     prevWordStartTime = currentWord.getEndTime(); 
     mCurrentWordIndex++; 
    } 
    return wordStart; 
} 

public final long getNextWordLength(){ 
    long wordLength; 
    if(mCurrentWordIndex < mBookPage.getWordList().size()){ 
     Word currentWord = mBookPage.getWordList().get(mCurrentWordIndex); 
     if(mCurrentWordIndex == 0){ 
      wordLength= currentWord.getStartTime(); 
     }else{ 
      wordLength = currentWord.getWordLength(); 
     } 
     mCurrentWordIndex++; 
    }else{ 
     wordLength = -1; 
    } 
    return wordLength; 
} 

public final void startPlayback(){ 
    mMediaPlayer = MediaPlayer.create(getActivity(), getAudioResourceId()); 
    mMediaPlayer.start(); 
} 

@Override 
public void onPause() { 
    // TODO Auto-generated method stub 
    Log.i(TAG,"onPause"); 
    mIsCurrentPage = false; 
    if(mSpeechController != null){ 
     mSpeechController.stopHighlighting(); 
    } 
    if(mMediaPlayer != null){ 
     try{ 
      mMediaPlayer.stop(); 
      mMediaPlayer.release(); 
     }catch(Exception e){ 

     } 
    } 
    resetHighlighters(); 
    resetAll(); 
    super.onPause(); 
} 

@Override 
public void onStop() { 
    // TODO Auto-generated method stub 
    super.onStop(); 
    Log.i(TAG,"onStop"); 
} 

protected void addHighlighter(TextHighlightController controller){ 
    if(mHighlighters == null){ 
     mHighlighters = new ArrayList<TextHighlightController>(); 
    } 
    mHighlighters.add(controller); 
} 

private void resetHighlighters(){ 
    if(mHighlighters != null){ 
     for(TextHighlightController controller : mHighlighters){ 
      controller.reset(); 
     } 
    } 
    mCurrentHighlightIndex = 0; 
    mCurrentWordIndex = 0; 
} 

private void resetAll(){ 
    mCurrentWordIndex = 0; 
    mCurrentHighlightIndex = 0; 
    if(mMediaPlayer != null){ 
     try{ 
      mMediaPlayer.reset(); 
     }catch(Exception e){ 

     } 
    } 
    if(mCurrentHighlightController != null){ 
     mCurrentHighlightController.reset(); 
    } 
    if(mSpeechController != null){ 
     Message msg = mSpeechController.obtainMessage(SpeechController.END_AUDIO); 
     mSpeechController.sendMessage(msg); 
    } 
    if(mHighlighters != null){ 
     for(TextHighlightController controller : mHighlighters){ 
      controller.reset(); 
     } 
    } 
} 

private void initAudioPlayback(){ 
    if(getJsonId() != 0){ 
     initHighlightersList(); 
     loadJson(); 
     mSpeechController = new SpeechController(this); 
     Message msg = mSpeechController.obtainMessage(SpeechController.START_AUTO_PLAY); 
     mSpeechController.sendMessageDelayed(msg, 1000); 
    } 
} 

private void disablePopupButtons(){ 
    if(getView() != null){ 
     int[] buttonsId = getPopupButtonsId(); 
     for(int currentButtonId : buttonsId){ 
      getView().findViewById(currentButtonId).setVisibility(View.INVISIBLE); 
     } 
    } 
} 

private void initHighlightersList(){ 
    loadHighlighters(); 
    if(mHighlighters != null) 
     mCurrentHighlightController = mHighlighters.get(mCurrentHighlightIndex); 
} 

private void loadJson(){ 
    Gson gson = new Gson(); 
    InputStream jsonStream = getResources().openRawResource(getJsonId()); 
    InputStreamReader jsonReader = new InputStreamReader(jsonStream); 
    mBookPage = gson.fromJson(jsonReader, BookPage.class); 
} 

private void configureBookPage(){ 
    int currentReadType = getReadTypeFromArgs(); 
    Log.i(TAG,"GotReadType"); 
    switch(currentReadType){ 
    case AUTO_PLAY: 
     if(mIsCurrentPage){ 
      startWithAutoPlay(); 
     } 
     break; 
    case READ_WITH_ME: 
     if(mIsCurrentPage){ 
      startWithRead(); 
     } 
     break; 
    case READ_TO_MYSELF: 
     //Should do Nothing 
     break; 
    default: 
     throw new IllegalArgumentException("You must select one of the reading types of BookPageFragment"); 
    } 
} 

protected int getReadTypeFromArgs(){ 
    return getArguments().getInt(READ_TYPE_KEY); 
}

}

LogCat yerine geçerli sayfa kullanacağım

(BookPageFragment) mBookPagerAdapter.instantiateItem(mBookPager, mBookPager.getCurrentItem());

Bu aslında bir görünümü var varolan parçasına bir başvuru verir almak için getItem kullanmanın

09-30 22:56:37.602: E/AndroidRuntime(7640): FATAL EXCEPTION: main 
09-30 22:56:37.602: E/AndroidRuntime(7640): java.lang.NullPointerException 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.fragment.BookPageFragment.loadHighlighters(BookPageFragment.java:68) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.fragment.BookPageFragment.initHighlightersList(BookPageFragment.java:275) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.fragment.BookPageFragment.initAudioPlayback(BookPageFragment.java:257) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.fragment.BookPageFragment.startWithRead(BookPageFragment.java:149) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.fragment.BookPageFragment.configureBookPage(BookPageFragment.java:298) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.fragment.BookPageFragment.onResume(BookPageFragment.java:140) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.mobimanage.kagadventures.MainActivity$1.onPageSelected(MainActivity.java:136) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:567) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:551) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2008) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.View.dispatchTouchEvent(View.java:7253) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2168) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1903) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2215) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1458) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.app.Activity.dispatchTouchEvent(Activity.java:2410) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2163) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.View.dispatchPointerEvent(View.java:7433) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3220) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3165) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4292) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4271) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4363) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:179) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.os.MessageQueue.nativePollOnce(Native Method) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.os.MessageQueue.next(MessageQueue.java:125) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.os.Looper.loop(Looper.java:124) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at android.app.ActivityThread.main(ActivityThread.java:5227) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at java.lang.reflect.Method.invokeNative(Native Method) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at java.lang.reflect.Method.invoke(Method.java:511) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 
09-30 22:56:37.602: E/AndroidRuntime(7640):  at dalvik.system.NativeStart.main(Native Method)

kaynak

2013-10-01 NemesisDoom

İlgili kodu gönderir misiniz? –

tamamlandı! – NemesisDoom

kodu var. Tamam. PagerStateFragmentAdapter'inizi tohumlamanız gerekiyor. –

. Her zamanki gibi

kaynak

2013-10-18 13:03:59

Küçük öneri: ilk "mBookPager" bağdaştırıcıdır, ikincisi viewPager'tır – Ron

Bununla ilgili sorun iki yönlüdür: ilk olarak, uygulamaya bağlı olarak geçersiz kılınmış instantiateItem() öğesine dayanır önceki fragman ama yeni bir tane oluşturmak için. İkinci olarak, bir Görünüme ilk argüman olarak atıfta bulunan çağrı kullanımdan kaldırılmıştır. - Bir çalışma çözümü buldum, cevap olarak göndereceğim. –

Günümü kurtardığın adam! –

siz, sayfa adaptörü içinde parçaları takip, bunun için aşağıdaki işlevi ekleyin:

private SparseArray<PageType> fragments; 
... 
public PageType getFragment(int position) { 
    return fragments.get(position); 
}

Sonra bir parçasını sorgulamak için kullanabilir. Ve getView() zaten tamam orada çalışacaktır:

PageType page = (PageType) pagesAdapter.getFragment(pager.getCurrentItem()); 
View view = page.getView().findViewById(R.id.whatever); 
view.invalidate();

kaynak

2014-04-04 10:32:35

Bu gerçekten işe yarıyor mu? Androd, bir parçayı yok etmeye karar verebilir, o zaman hala fragmanlarınızda dizidir ve daha sonra yeniden yaratırsanız, dizide eski bir versiyonunuz vardır. Yine de bunun olabileceğinden emin değilim. –

setRetainInstance android.support.v4.app.FragmentManager için dikkate alınmaz.

Benim için çalışan çözüm, kurtarılmamış parçacıkları etkinliğimin onCreate super.OnCreate uygulamasından kaldırılıyordu.

if(savedInstanceState != null) { 
    savedInstanceState.remove("android:support:fragments"); 
}

ben parçaları kendileri çalışmak setRetainInstance(true); beklenen şekilde benim için çalıştı.

Bu çözümü

here bulundu * Eğer fragmanlarının herhangi bir DialogFragment için aradığınız eğer bu çözümü kullanırsanız, onlar oryantasyon değişikliği görevden unutmayın.

kaynak

2017-07-07 16:31:28

ViewView öğesinin iç kısmı getView() içinde dönen döndürücü()

cevap

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