Просмотры return NullPointerException в onBindViewHolder в адаптере RecyclerView

Question

Я хочу создать пользовательский адаптер для RecyclerView, но когда я устанавливаю Text или устанавливаю значение для любого представления, это возвращает NullPointerException. Я не знаю почему. Пробовал много решений, но все они не работали. Мой адаптер:

public class HistoryViewAdapter extends RecyclerView.Adapter<HistoryViewHolder> { 

    private ArrayList<ApplicationDataManager> arrayOfHistoryManagerClass; 


    public HistoryViewAdapter(ArrayList<ApplicationDataManager> HistoryClassArray) { 

     this.arrayOfHistoryManagerClass = HistoryClassArray; 

    } 


    @Override 
    public HistoryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View itemView = LayoutInflater. 
       from(parent.getContext()). 
       inflate(R.layout.history_translate_include, parent, false); 

     return new HistoryViewHolder(itemView); 
    } 

    @Override 
    public void onBindViewHolder(HistoryViewHolder holder, int position) { 
     ApplicationDataManager managerClass = arrayOfHistoryManagerClass.get(position); 
      holder.NonTranslatedWord.setText(managerClass.getNonTranslatedText()); 
      holder.TranslatedWord.setText(managerClass.GetTranslatedText()); 
      holder.isFavoret.setChecked(managerClass.GetFavoredStat()); 

    } 

    @Override 
    public int getItemCount() { 
     return arrayOfHistoryManagerClass.size(); 
    } 



} 

Мои ViewHolder (я попробовал FindViewByid вместо нож для масла, но это дает тот же Exception):

public class HistoryViewHolder extends RecyclerView.ViewHolder { 
    // Defining a TextView 
    @InjectView(R.id.translated_word) 
    protected TextView TranslatedWord; 
    // Defining a TextView 
    @InjectView(R.id.non_translated_word) 
    protected TextView NonTranslatedWord; 
    @InjectView(R.id.history_checkBox) 
    protected CheckBox isFavoret; 

    public HistoryViewHolder(View itemView) { 
     super(itemView); 
     //injecting views 
     ButterKnife.inject(itemView); 

    } 
} 

Наконец MyFragment:

public class HistoryFragment extends Fragment { 
    @InjectView(R.id.history_recyclerview) 
    RecyclerView historyRecycler; 
    HistoryViewAdapter historyViewAdapter; 
    ArrayList<ApplicationDataManager> listDataManager; 
    LinearLayoutManager layoutManager; 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.history_translate_include, container, false); 
     ButterKnife.inject(this, rootView); 

     layoutManager = new LinearLayoutManager(getActivity()); 
     layoutManager.setOrientation(LinearLayoutManager.VERTICAL); 
     historyRecycler.setLayoutManager(layoutManager); 

     listDataManager = new ArrayList<ApplicationDataManager>(); 
     listDataManager.add(new ApplicationDataManager("Test","Test",true,"Engilsh","arabic")); 
     listDataManager.add(new ApplicationDataManager("Test","Test",false,"Engilsh","arabic")); 

     historyViewAdapter = new HistoryViewAdapter(listDataManager); 

     historyRecycler.setAdapter(historyViewAdapter); 


     return rootView; 
    } 
} 

UPDATE: Мой LogCat :

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 
      at list.adapter.HistoryViewAdapter.onBindViewHolder(HistoryViewAdapter.java:42) 
      at list.adapter.HistoryViewAdapter.onBindViewHolder(HistoryViewAdapter.java:18) 
      at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:4138) 
      at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3448) 
      at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3340) 
      at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1810) 
      at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1306) 
      at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1269) 
      at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:523) 
      at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:1988) 
      at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2237) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.widget.ScrollView.onLayout(ScrollView.java:1531) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1705) 
      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1559) 
      at android.widget.LinearLayout.onLayout(LinearLayout.java:1468) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
      at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
      at android.view.View.layout(View.java:15631) 
      at android.view.ViewGroup.layout(ViewGroup.java:4966) 
      at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1705) 
      at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1559) 
      at android.widget.LinearLayout.onLayout(LinearLayout.j 

Мой history_translate_include.xml:

<?xml version="1.0" encoding="utf-8"?> 
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 

     <TextView 
      android:id="@+id/history_textview" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentLeft="true" 
      android:layout_alignParentStart="true" 
      android:layout_alignParentTop="true" 
      android:layout_marginLeft="10dp" 
      android:text="@string/translate_history" 
      android:textAppearance="?android:attr/textAppearanceLarge" /> 

     <RecyclerView 

      android:id="@+id/history_recyclerview" 
      android:layout_width="match_parent" 
      android:layout_height="400dp" 
      android:layout_alignLeft="@+id/history_textview" 
      android:layout_alignParentEnd="true" 
      android:layout_alignParentRight="true" 
      android:layout_alignStart="@+id/history_textview" 
      android:layout_below="@+id/history_textview" 
      android:layout_marginRight="10dp" 
      android:layout_marginTop="10dp" 

      /> 
    </RelativeLayout> 

</ScrollView> 

Заранее спасибо

Answer 1

Вы используете неправильный метод INJECT нож для масла.

Используйте HistoryViewHolder конструктор ниже:

public HistoryViewHolder(View itemView) { 
    super(itemView); 
    //This line is important 
    ButterKnife.inject(this,itemView); 

} 

вместо

public HistoryViewHolder(View itemView) { 
    super(itemView); 
    //injecting views 
    ButterKnife.inject(itemView); 

} 

Если вы хотите, чтобы ввести некоторые виды для объекта, который содержит эти взгляды, но это не FragmentActivity или View, вы должны метод звонка:

ButterKnife.inject(Object,View); 

И кроме того, вы используете history_translate_include в методе onCreateViewHolder, вы должны использовать там макет для одного элемента, который содержит вид с этими идентификаторами: translated_word, non_translated_word, history_checkBox

@Override 
public HistoryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

    View itemView = LayoutInflater. 
      from(parent.getContext()). 
      inflate(R.layout.layout_for_single_item, parent, false); 

    return new HistoryViewHolder(itemView); 
}