RecyclerView onBindViewHolder出现空指针异常

Question

package com.example.haha.note;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

/**
* Created by haha on 2017/9/8.
*/

public class NotesTitleFragment extends Fragment {
   private boolean isTwoPane;
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
       View view=inflater.inflate(R.layout.notes_title_frag,container,false);
       RecyclerView noteTitleRecyclerView=(RecyclerView) view.findViewById(R.id.notes_title_recycler_view);
       LinearLayoutManager layoutManager=new LinearLayoutManager(getActivity());
       noteTitleRecyclerView.setLayoutManager(layoutManager);
       NoteAdapter adapter=new NoteAdapter(getNote());
       noteTitleRecyclerView.setAdapter(adapter);
       return view;
   }
   private List<notes> getNote(){
       List<notes> notesList=new ArrayList<>();
       for(int i=1;i<=50;i++){
           notes note=new notes();
           note.setTitle("This is title" + i);
           note.setContent(getRandomLengthContent("This is note content"+i+"."));
           notesList.add(note);
       }
       return notesList;
   }
   private String getRandomLengthContent(String content){
       Random random=new Random();
       int length=random.nextInt(20)+1;
       StringBuilder builder=new StringBuilder();
       for(int i=0;i<length;i++){
           builder.append(content);
       }
       return builder.toString();
   }
   public void onActivityCreated(Bundle savedInstanceState){
       super.onActivityCreated(savedInstanceState);
       if(getActivity().findViewById(R.id.notes_content_layout) !=null){
           isTwoPane=true;
       }
       else isTwoPane=false;

   }
   class NoteAdapter extends RecyclerView.Adapter<NoteAdapter.ViewHolder>{
       private List<notes> mNoteList;
          class ViewHolder extends RecyclerView.ViewHolder{
           TextView noteTitleText;
           public  ViewHolder(View view){
               super(view);
               noteTitleText=(TextView) view.findViewById(R.id.note_title);
           }
       }
       public NoteAdapter(List<notes> notesList){
           mNoteList=notesList;
       }
      @Override
      public ViewHolder onCreateViewHolder(ViewGroup parent,int viewType){
           View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.notes_item,parent,false);
           final ViewHolder holder=new ViewHolder(view);

            view.setOnClickListener(new View.OnClickListener() {
               @Override
               public void onClick(View view) {
                   notes note=mNoteList.get(holder.getAdapterPosition());
                   if(isTwoPane){
                       NotesContentFragment notesContentFragment=(NotesContentFragment) getFragmentManager().findFragmentById(R.id.notes_content_fragment);
                      notesContentFragment.refresh(note.getTitle(),note.getContent());
                   }else {
                       notesContentActivity.actionStart(getActivity(),note.getTitle(),note.getContent());
                   }
               }
           });
           return  holder;
       }

       public void onBindViewHolder(ViewHolder holder,int position){
           notes note=mNoteList.get(position);
           holder.noteTitleText.setText(note.getTitle());
       }

       public int getItemCount(){
           return mNoteList.size();
       }
   }
}试过网上说得很多办法都没解决问题，小白求教

Answer 1

错误日志贴出来看看