RecyclerViewのnotifyDataSetChanged android

Question

私のコードにはnotifyDataSetChangedのRecyclerviewに問題があります。ここで私のコードは、それを修正するために私を助けてください。

public class FragmentListFilm extends BaseFragment { 

    private static final String TAG = FragmentListFilm.class.getSimpleName(); 
    private static final String url "http://api.androidhive.info/json/movies.json"; 
    private List<InforFilm> inforFilms = new ArrayList<InforFilm>(); 
    private Fragment_Film_Adapter adapter; 
    private DialogActivity dialogActivity; 
    View root; 
    private ProgressDialog pDialog; 
    private RecyclerView rv; 

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

    } 
    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     root = inflater.inflate(R.layout.fragment_film, container, false); 
     rv = (RecyclerView) root.findViewById(R.id._recycler_fragment_film); 
     setUpRecycleView(rv); 

     return root; 
    } 

    private void setUpRecycleView(RecyclerView recycleView) { 
     recycleView.setLayoutManager(new LinearLayoutManager(recycleView.getContext())); 
     recycleView.setAdapter(adapter); 

     pDialog = new ProgressDialog(getActivity()); 
     // Showing progress dialog before making http request 
     pDialog.setMessage("Loading..."); 
     pDialog.show(); 

     // recycleView. 
     JsonArrayRequest movieReq = new JsonArrayRequest(url, 
       new Response.Listener<JSONArray>() { 
        @Override 
        public void onResponse(JSONArray response) { 
         Log.d(TAG, response.toString()); 
         hidePDialog(); 

         // Parsing json 
         for (int i = 0; i < response.length(); i++) { 
          try { 
           // Log.d(TAG, "try-cat"); 
           JSONObject obj = response.getJSONObject(i); 
           InforFilm film = new InforFilm(); 

           film.setTitle(obj.getString("title")); 
           film.setThumbail(obj.getString("image")); 
           film.setRating(((Number) obj.get("rating")) 
             .doubleValue()); 
           film.setYear(obj.getInt("releaseYear")); 

           // Genre is json array 
           JSONArray genreArry = obj.getJSONArray("genre"); 
           ArrayList<String> genre = new ArrayList<String>(); 
           for (int j = 0; j < genreArry.length(); j++) { 
            genre.add((String) genreArry.get(j)); 
           } 
           film.setGender(genre); 

           // adding movie to movies array 
           inforFilms.add(film); 


          } catch (JSONException e) { 
           e.printStackTrace(); 
          } 
         } 

         // notifying list adapter about data changes 
         // so that it renders the list view with updated data 
         Log.d(TAG, "notifydatasetchanged"); 
         adapter.notifyDataSetChanged(); 

        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       VolleyLog.d(TAG, "Error: " + error.getMessage()); 
       hidePDialog(); 

      } 
     }); 

     // Adding request to request queue 
     AppController.getInstance().addToRequestQueue(movieReq); 
    } 

    private void hidePDialog() { 
     if (pDialog != null) { 
      pDialog.dismiss(); 
      pDialog = null; 
     } 
    } 

} 

//////アダプタ

public class Fragment_Film_Adapter extends RecyclerView.Adapter<Fragment_Film_Adapter.ViewHolder> { 

    private List<InforFilm> inforFilms; 
    ImageLoader imageLoader = AppController.getInstance().getmImageLoader(); 

    public Fragment_Film_Adapter(List<InforFilm> inforFilms) { 
     this.inforFilms = inforFilms; 
    } 

    public class ViewHolder extends RecyclerView.ViewHolder { 

     @Bind(R.id.film_thumbnail) 
     NetworkImageView thumbNail; 
     @Bind(R.id.film_genre) 
     TextView gender; 
     @Bind(R.id.film_rating) 
     TextView rating; 
     @Bind(R.id.film_title) 
     TextView title; 
     @Bind(R.id.film_releaseYear) 
     TextView year; 

     public ViewHolder(View view) { 
      super(view); 
     } 
    } 

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

     View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_film_item, parent, false); 

     return new ViewHolder(view); 
    } 

    @Override 
    public void onBindViewHolder(ViewHolder holder, int position) { 
     InforFilm infor = inforFilms.get(position); 

     holder.thumbNail.setImageUrl(infor.getThumbail(), imageLoader); 
     holder.title.setText(infor.getTitle()); 
     holder.rating.setText(String.valueOf(infor.getRating())); 
     holder.year.setText(infor.getYear()); 
     String genreStr = ""; 
     for (String str : infor.getGender()) { 
      genreStr += str + ", "; 
     } 
     genreStr = genreStr.length() > 0 ? genreStr.substring(0, 
       genreStr.length() - 2) : genreStr; 
     holder.gender.setText(genreStr); 
    } 

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


} 

それは次の例外スロー：それを初期化RecyclerViewにアダプタを設定する前に

Attempt to invoke virtual method 'void com.example.qtv.qtvmaterial.adapter.Fragment_Film_Adapter.notifyDataSetChanged()' on a null object reference 
     at com.example.qtv.qtvmaterial.fragment.FragmentListFilm$1.onResponse(FragmentListFilm.java:110) 
     at com.example.qtv.qtvmaterial.fragment.FragmentListFilm$1.onResponse(FragmentListFilm.java:71) 

Answer 1

を：

recycleView.setLayoutManager(new LinearLayoutManager(recycleView.getContext())); 
adapter = new Fragment_Film_Adapter(inforFilms); 
recycleView.setAdapter(adapter);