查看里面的RecyclerView返回null

我想设置一个onClickListener到我的CheckBox，但我的CheckBox实例返回null onClickListener给我一个nullPointerException。我已经看过类似于我的其他问题，并没有发现任何有效的工作。我对RecyclerView不太熟悉，所以如果它与我如何初始化视图有关，我不会感到惊讶。查看里面的RecyclerView返回null

这里是question-

Months0Through6.java 

public class Months0Through6 extends android.support.v4.app.Fragment { 

public Months0Through6() { 
    // Required empty public constructor 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

} 

CheckBox checkBox; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View rootView = inflater.inflate(R.layout.fragment_blank, container, false); 

    //This is returning null 
    checkBox = (CheckBox)rootView.findViewById(R.id.checkBox_ID); 

    RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view); 
    rv.setHasFixedSize(true); 
    MilestonesAdapter adapter = new MilestonesAdapter(new String[]{"Month 0 stuff", "Example Two", "Example Three", "Example Four", "Example Five" , "Example Six" , "Example Seven"}); 
    rv.setAdapter(adapter); 

    LinearLayoutManager llm = new LinearLayoutManager(getActivity()); 
    rv.setLayoutManager(llm); 

    checkBox.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Toast.makeText(getContext(), 
        "Your Message", Toast.LENGTH_LONG).show(); 

     } 
    }); 

    return rootView; 
}

card_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="68dp"> 

    <android.support.v7.widget.CardView 
     android:id="@+id/card_view" 
     xmlns:card_view="http://schemas.android.com/apk/res-auto" 
     android:layout_width="match_parent" 
     android:layout_margin="10dp" 
     android:layout_height="62dp" 
     card_view:cardCornerRadius="4dp" 
     card_view:elevation="14dp"> 

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

      <CheckBox 
       android:id="@+id/checkBox_ID" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content"/> 

      <TextView 
       android:id="@+id/tv_text" 
       android:layout_toRightOf ="@+id/checkBox_ID" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:gravity="center" > 
      </TextView> 

      <TextView 
       android:id="@+id/tv_blah" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="Another Recyclerview Fragment" 
       android:layout_below="@+id/tv_text" 
       android:layout_toRightOf="@+id/checkBox_ID" 
       android:layout_toEndOf="@+id/checkBox_ID"> 
      </TextView> 

     </RelativeLayout> 
    </android.support.v7.widget.CardView> 

</RelativeLayout>

来源

2017-08-01 Ryder Thacker