Как я могу отображать данные от Json

Question

package comeagain.materialdesign.fragments; 


import android.os.Bundle; 
import android.os.Message; 
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.Toast; 

import com.android.volley.Request; 
import com.android.volley.RequestQueue; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.ImageLoader; 
import com.android.volley.toolbox.JsonObjectRequest; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.text.DateFormat; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Date; 

import javax.xml.transform.ErrorListener; 

import comeagain.materialdesign.Log.L; 
import comeagain.materialdesign.R; 
import comeagain.materialdesign.adapters.AdapterBoxOffice; 
import comeagain.materialdesign.extras.Keys; 
import comeagain.materialdesign.extras.UrlEndpoints; 
import comeagain.materialdesign.materialTest.MyApplication; 
import comeagain.materialdesign.network.VollleySingleton; 
import comeagain.materialdesign.pojo.Movie; 

import static comeagain.materialdesign.extras.Keys.EndpointBoxOffice.*; 
import static comeagain.materialdesign.extras.UrlEndpoints.*; 

/** 
* A simple {@link Fragment} subclass. 
* Use the {@link FragmentBoxOffice#newInstance} factory method to 
* create an instance of this fragment. 
*/ 
public class FragmentBoxOffice extends Fragment { 
    // TODO: Rename parameter arguments, choose names that match 
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
    private static final String ARG_PARAM1 = "param1"; 
    private static final String ARG_PARAM2 = "param2"; 
    private static final String URL_ROTTEN_TOMATOES_BOX_OFFICE = "http://api.rottentomatoes.com/api/public/v1.0/lists/movies/box_office.json?apikey=54wzfswsa4qmjg8hjwa64d4c"; 
    // TODO: Rename and change types of parameters 
    private String mParam1; 
    private String mParam2; 
    private VollleySingleton vollleySingleton; 
    private ImageLoader imageLoader; 
    private RequestQueue requestQueue; 
    private ArrayList<Movie> listMovies = new ArrayList<>(); 
    private DateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd"); 
    private RecyclerView listMovieHits; 
    private AdapterBoxOffice adapterBoxOffice; 

    public FragmentBoxOffice() { 

    } 

    /** 
    * Use this factory method to create a new instance of 
    * this fragment using the provided parameters. 
    * 
    * @param param1 Parameter 1. 
    * @param param2 Parameter 2. 
    * @return A new instance of fragment FragmentBoxOffice. 
    */ 
    // TODO: Rename and change types and number of parameters 
    public static FragmentBoxOffice newInstance(String param1, String param2) { 
     FragmentBoxOffice fragment = new FragmentBoxOffice(); 
     Bundle args = new Bundle(); 
     args.putString(ARG_PARAM1, param1); 
     args.putString(ARG_PARAM2, param2); 
     fragment.setArguments(args); 
     return fragment; 
    } 

    public static String getRequestUrl(int limit) { 
     return URL_ROTTEN_TOMATOES_BOX_OFFICE+"&=10"; 
    } 


    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     if (getArguments() != null) { 
      mParam1 = getArguments().getString(ARG_PARAM1); 
      mParam2 = getArguments().getString(ARG_PARAM2); 
     } 
     vollleySingleton = VollleySingleton.getsInstance(); 
     requestQueue = vollleySingleton.getmRequestQueue(); 

    } 

    private void sendJsonRequest() { 
     JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, getRequestUrl(10), 
       (String) null, 
       new Response.Listener<JSONObject>() { 
        @Override 
        public void onResponse(JSONObject response) { 
         listMovies = parseJSONResponse(response); 


         adapterBoxOffice.setMovieList(listMovies); 
         Log.i("The Movie list: ", listMovies.toString()); 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 

      } 
     }); 
     requestQueue.add(request); 
    } 

    private ArrayList<Movie> parseJSONResponse(JSONObject response) { 
     ArrayList<Movie> listMovies = new ArrayList<>(); 
     if (response == null || response.length() == 0) { 


      try { 
       StringBuilder data = new StringBuilder(); 
       JSONArray arrayMovies = response.getJSONArray(KEY_MOVIES); 

       for (int i = 0; i < arrayMovies.length(); i++) { 
        JSONObject currentMovie = arrayMovies.getJSONObject(i); 
        //get the currentMovie id 
        long id = currentMovie.getLong(KEY_ID); 
        //get the title of the current movie 
        String title = currentMovie.getString(KEY_TITLE); 
        //get the date in theater for the current movie 
        JSONObject objectReleaseDates = currentMovie.getJSONObject(KEY_RELEASE_DATES); 
        String releaseDate = null; 
        if (objectReleaseDates.has(KEY_THEATER)) { 
         releaseDate = objectReleaseDates.getString(KEY_THEATER); 
        } else { 
         releaseDate = "N/A"; 
        } 
        //get the audience score for the current movie 
        JSONObject objectRatings = currentMovie.getJSONObject(KEY_RATINGS); 
        int audienceScore = -1; 
        if (objectRatings.has(KEY_AUDIENCE_SCORE)) { 
         audienceScore = objectRatings.getInt(KEY_AUDIENCE_SCORE); 
        } 
        //get the synopsis of the current movie 
        String synopsis = currentMovie.getString(KEY_SYNOPSIS); 
        JSONObject objectPosters = currentMovie.getJSONObject(KEY_POSTERS); 
        String urlThumnail = null; 
        if (objectPosters.has(KEY_THUMBNAIL)) { 
         urlThumnail = objectPosters.getString(KEY_THUMBNAIL); 
        } 
        Movie movie = new Movie(); 
        movie.setTitle(title); 
        Date date = null; 
        date = dateformat.parse(releaseDate); 

        movie.setReleaseDateTheater(date); 
        movie.setAudienceScore(audienceScore); 
        movie.setSynopsis(synopsis); 
        movie.setUrlThumbnail(urlThumnail); 
        listMovies.add(movie); 

       /*data.append(id + " " + title + " " + releaseDate + " " + audienceScore + "\n");*/ 
       } 


       /*L.T(getActivity(), listMovies.toString());*/ 

      } catch (JSONException e) { 

      } catch (ParseException e) { 
       e.printStackTrace(); 
      } 
      Log.i("The myListofMovies: ", listMovies.toString()); 
     } 
     return listMovies; 

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View view = inflater.inflate(R.layout.fragment_box_office, container, false); 
     listMovieHits = (RecyclerView) view.findViewById(R.id.listMovieHits); 
     listMovieHits.setLayoutManager(new LinearLayoutManager(getActivity())); 
     adapterBoxOffice = new AdapterBoxOffice(getActivity()); 
     listMovieHits.setAdapter(adapterBoxOffice); 

     sendJsonRequest(); 
     return view; 
    } 

} 

Моя проблема в parseJSONResponse. Этот метод не выполняется. Он должен разобрать listMovies. Я попробовал Logging (Log.i («Список фильмов:», listMovies.toString());) в методе sendJsonRequest enter code here и ничего не возвращает в файл регистрации.

Answer 1

Ваш ответ получает синтаксический анализ всякий раз, когда он равен null или length равен 0. Разве эта линия не должна быть такой?

if (response != null && response.length() > 0)