Android: неверный индекс 0, размер равен 0. ГДЕ?

Question

Я получаю недопустимый индекс 0, размер ошибки 0 и не может понять, где это происходит. Я запускаю отладчик и не могу его разместить. Все, что я знаю, это то, что происходит в моем коде раньше и что произойдет после. Ниже я разместил logcat, код, который заканчивается перед сбоем, и что будет работать после.

Вот LogCat:

java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 
     at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255) 
     at java.util.ArrayList.get(ArrayList.java:308) 
     at android.widget.HeaderViewListAdapter.isEnabled(HeaderViewListAdapter.java:164) 
     at android.widget.ListView.dispatchDraw(ListView.java:3307) 
     at android.view.View.draw(View.java:15174) 
     at android.widget.AbsListView.draw(AbsListView.java:4318) 
     at android.view.View.updateDisplayListIfDirty(View.java:14096) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.draw(View.java:15174) 
     at android.view.View.updateDisplayListIfDirty(View.java:14096) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1089) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.updateDisplayListIfDirty(View.java:14091) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.View.draw(View.java:14895) 
     at android.view.ViewGroup.drawChild(ViewGroup.java:3407) 
     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3201) 
     at android.view.View.draw(View.java:15174) 
     at android.widget.FrameLayout.draw(FrameLayout.java:592) 
     at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2695) 
     at android.view.View.updateDisplayListIfDirty(View.java:14096) 
     at android.view.View.getDisplayList(View.java:14119) 
     at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:266) 
     at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:272) 
     at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:311) 
     at android.view.ViewRootImpl.draw(ViewRootImpl.java:2531) 
     at android.view. 

Вот мой код прямо перед, что он заканчивает:

@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
    Answer a = null; 
    if(position -1 >= 0 && myAnswerNotices.size() > position -1){ 
     a = myAnswerNotices.get(position-1); 
     QuestionFragment.clicked_Question = a.getQuestion(); 
    } 

    // Go to question view 
    Intent intent; 

    if(QuestionFragment.clicked_Question.getType().equals("poll")) 
     intent = new Intent (getActivity(), PollViewActivity.class); 
    else 
     intent = new Intent (getActivity(), QuestionViewActivity.class); 

    if(a != null) { 
     if (preferences.contains("notice_" + a.getObjectId())) { 
      editor.remove("notice_" + a.getObjectId()); 
      editor.commit(); 
     } 

     if (myAnswerNotices != null && !myAnswerNotices.isEmpty() && myAnswerNotices.contains(a)) 
      myAnswerNotices.remove(a); 
    } 

    startActivity(intent); 

} 

Вот код, который должен начинаться после:

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); 
    setContentView(R.layout.activity_question_view); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.question_view_toolbar); 
    setSupportActionBar(toolbar); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
    getSupportActionBar().setHomeButtonEnabled(true); 

    share = (ImageButton) findViewById(R.id.questionView_share_image_button); 
    emailButton = (Button) findViewById(R.id.questionView_email_button); 
    title = (TextView) findViewById(R.id.questionView_title_text_view); 
    username = (TextView) findViewById(R.id.questionView_askedBy_text_view); 
    createdAt = (TextView) findViewById(R.id.questionView_createdAt_text_view); 
    followingTextView = (TextView) findViewById(R.id.questionView_follow_textview); 

    setupQuestion(); 
    setListeners(); 
    setupList(); 

} 

@Colin:

myAnswerNotices инициализируется как переменную:

public class NotificationFragment extends Fragment 
    implements AdapterView.OnItemClickListener, SwipeRefreshLayout.OnRefreshListener { 

private final List<Answer> myAnswerNotices = new ArrayList<>(); 

и заселен в AsyncTask: общественного класс RefreshTask расширяет AsyncTask> {

@Override 
    protected void onPreExecute() { 
     mRefreshWrapper.setRefreshing(true); 
     // Activity.pinAll(); 
    } 

    @Override 
    protected List<Answer> doInBackground(Object... params) { 

     //myAnswerNotices.clear(); 
     // List<Activity> a_list = new ArrayList<>(); 
     try { 
      activityNotifications.addAll(Activity.getQuery() 
        .whereEqualTo(Constants.kQollegeActivityTypeKey, Constants.kQollegeActivityTypeAnswerPosted) 
        .whereEqualTo(Constants.kQollegeActivityToUserKey, ParseUser.getCurrentUser()) 
        .whereGreaterThan(Constants.kQollegeQuestionCreatedAtKey, checked) 
        .orderByDescending(Constants.kQollegeQuestionCreatedAtKey) 
        .include(Constants.kQollegeActivityAnswerKey) 
        .find()); 
     } catch (ParseException e) { 
      e.printStackTrace(); 
     } 
     checked = Calendar.getInstance().getTime(); 
     editor.putLong("notification_checked",checked.getTime()); 
     editor.commit(); 


     for(String s : preferences.getAll().keySet()){ 
      if(s.contains("notice_")){ 
       String a_id = preferences.getString(s, null); 
       if(a_id != null){ 
        try { 
         myAnswerNotices.add(Answer.getQuery().get(a_id)); 
        } catch (ParseException e) { 
         e.printStackTrace(); 
        } 
       } 
      } 
     } 

     for(Activity a : activityNotifications){ 
      myAnswerNotices.add(a.getAnswer()); 
     } 

     return myAnswerNotices; 

    } 

    @Override 
    protected void onPostExecute(List<Answer> list) { 
     if(!myAnswerNotices.isEmpty()) 
      mHeaderTextView.setVisibility(View.GONE); 
     else { 
      mHeaderTextView.setText("No notifications"); 
      mHeaderTextView.setVisibility(View.VISIBLE); 
     } 

     mRefreshWrapper.setRefreshing(false); 

    } 

@Varsha: Вот код, относящийся к моей инициализации адаптера :

NotificationListAdapter mListAdapter = new NotificationListAdapter(getActivity(), R.layout.notification_list_item, myAnswerNotices); 
    mRefreshWrapper.getListView().setAdapter(mListAdapter); 
    mListAdapter.setNotifyOnChange(true); 

@Titus: Вот весь мой класс адаптера:

class NotificationListAdapter extends ArrayAdapter { 

private final int mResourceId; 
private final LayoutInflater inflater; 
private final Context context; 
private NotificationListItemHolder notificationView; 
private Answer answer; 

public NotificationListAdapter(Context ctx, int resourceId, List objects){ 
    super(ctx,resourceId,objects); 
    mResourceId = resourceId; 
    inflater = LayoutInflater.from(ctx); 
    context = ctx; 
} 

@Override 
public View getView (int position, View convertView, ViewGroup parent) { 
    answer = (Answer) getItem(position); 

    // Get or create cached eventView 
    if(convertView == null){ 
     convertView = inflater.inflate(mResourceId, null); 
     notificationView = new NotificationListItemHolder(convertView); 
     convertView.setTag(notificationView); 
    } 
    else { 
     notificationView = (NotificationListItemHolder) convertView.getTag(); 
    } 
    TextView name = notificationView.getPostedByTextView(); 
    name.setTag(answer); 
    // Fill Data 
    fillData(); 

    name.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 

      Intent intent = new Intent(context, ProfileActivity.class); 
      Answer a = (Answer) v.getTag(); 
      ParseUser u = a.getPostedBy(); 

      intent.putExtra("User", u.getObjectId()); 
      context.startActivity(intent); 
     } 
    }); 



    return convertView; 
} 

private void fillData(){ 
    try { 
     Question q = answer.getQuestion().fetch(); 
     notificationView.getTitleTextView().setText(q.getTitle()); 
    } catch (ParseException e) { 
     e.printStackTrace(); 
    } 
    notificationView.getPostedByTextView().setText(answer.getPostedByText()); 
    notificationView.getCreatedAtTextView().setText(answer.getCreatedAtText()); 
} 

}

Answer 1

Примечание: Я не хватает репутации комментировать так писать этот ответ.

Это, кажется, GetCount метод() в адаптере просто переопределить этот метод:

if(myAnswerNotices == null || myAnswerNotices.size()>0) 
return myAnswerNotices.size(); 
else 
return 0; 

Я надеюсь, что это поможет. Спасибо