の解析JSONのnull値が返された後、それは

Question

{ 
    "page": 1, 
    "results": [ 
    { 
     "poster_path": "/lIv1QinFqz4dlp5U4lQ6HaiskOZ.jpg", 
     "adult": false, 
     "overview": "Under the direction of a ruthless instructor, a talented young drummer begins to pursue perfection at any cost, even his humanity.", 
     "release_date": "2014-10-10", 
     "genre_ids": [ 
     18, 
     10402 
     ], 
     "id": 244786, 
     "original_title": "Whiplash", 
     "original_language": "en", 
     "title": "Whiplash", 
     "backdrop_path": "/6bbZ6XyvgfjhQwbplnUh1LSj1ky.jpg", 
     "popularity": 7.361171, 
     "vote_count": 1949, 
     "video": false, 
     "vote_average": 8.32 
    } 
    ] 
} 

nullではないにもかかわらず、これが私のJSON応答であるが、私はそれを解析する際、IDの値は常にnullである以下 が私のネットワーキングとJSONの解析コードで助けてください..

public class movietask extends AsyncTask<String, Void, List<movieobject>> { 
    private String TAG; 
    private static final String Base_string = "http://api.themoviedb.org/3/movie/"; 
    private static final String api_key = "388e5684ea2f3bb8de279874cb6990a5"; 
    private static final String MOVIE_ID="id"; 
    private static final String MOVIE_OVERVIEW="overview"; 
    private static final String MOVIE_TITLE="original_title"; 
    private static final String MOVIE_VOTE="vote_average"; 
    private static final String MOVIE_POSTERPATH="poster_path"; 
    private static final String MOVIE_RELEASE_DATE="release_date"; 
    private static final String MOVIE_BACKDROP_PATH="backdrop_path"; 

    // Parse json data to get arraylist of movieobjects 

    private List<movieobject> getparseddata(String forecastjsonstr) 
      throws JSONException { 
     final String START_OF_JSON = "results"; 
     JSONObject startlist = new JSONObject(forecastjsonstr); 
     JSONArray startarray = startlist.getJSONArray(START_OF_JSON); 
     int noofobjects = startarray.length(); 
     List<movieobject> objectarray = new ArrayList<>(); 
     for (int i = 0; i < noofobjects; i++) { 
      JSONObject object = startarray.getJSONObject(i); 
      movieobject finalobjectarray = new movieobject(); 
      finalobjectarray.setMovieId(object.getString(MOVIE_ID)); 
      finalobjectarray.setOverview(object.getString(MOVIE_OVERVIEW)); 
      finalobjectarray.setTitle(object.getString(MOVIE_TITLE)); 
      finalobjectarray.setMovieRating(object.getString(MOVIE_VOTE)); 
      finalobjectarray.setPosterPath(object.getString(MOVIE_POSTERPATH)); 
      finalobjectarray.setReleaseDate(object.getString(MOVIE_RELEASE_DATE)); 
      finalobjectarray.setBackdroppath(object.getString(MOVIE_BACKDROP_PATH)+"/10"); 
      objectarray.add(finalobjectarray); 
     } 

     return objectarray; 

    } 



    protected List<movieobject> doInBackground(String... params) { 
     HttpURLConnection urlConnection = null; 
     BufferedReader reader = null; 
     List<movieobject> finalobjectarray = new ArrayList<>(); 

     // Will contain the raw JSON response as a string. 
     String forecastJsonStr = null; 

     try { 


      URL url = new URL(Base_string + params[0] + "?api_key="+api_key); 


      urlConnection = (HttpURLConnection) url.openConnection(); 
      urlConnection.setRequestMethod("GET"); 
      urlConnection.connect(); 

      // Read the input stream into a String 
      InputStream inputStream = urlConnection.getInputStream(); 
      StringBuffer buffer = new StringBuffer(); 
      if (inputStream == null) { 
       // Nothing to do. 

      } 
      reader = new BufferedReader(new InputStreamReader(inputStream)); 

      String line; 
      while ((line = reader.readLine()) != null) { 
       buffer.append(line + "\n"); 
      } 

      if (buffer.length() == 0) { 
       return null; 

      } 
      forecastJsonStr = buffer.toString(); 
      Log.i("hey", "Hello" + forecastJsonStr); 
     } catch (IOException e) { 
      Log.e("PlaceholderFragment", "Error ", e); 
     } finally { 
      if (urlConnection != null) { 
       urlConnection.disconnect(); 
      } 
      if (reader != null) { 
       try { 
        reader.close(); 
       } catch (final IOException e) { 
        Log.e("PlaceholderFragment", "Error closing stream", e); 
       } 
      } 
     } 

     try { 
      finalobjectarray = getparseddata(forecastJsonStr); 
     } catch (JSONException e) { 
      Log.e("Json exception", e.getMessage(), e); 
      e.printStackTrace(); 
     } 

     return finalobjectarray; //final movieobject array 
    } 


    //onPostExecute method of asynctask 

    protected void onPostExecute(List<movieobject> results) { 
    } 
} 

Answer 1

IDがnullです：理想的には、ムービーオブジェクト内のMOVIEIDはint型でなければなりません。

JSONを確認してみましょう。

{ 
    "page":1, 
    "results":[ 
     { 
     "poster_path":"/lIv1QinFqz4dlp5U4lQ6HaiskOZ.jpg", 
     "adult":false, 
     "overview":"Under the direction of a ruthless instructor, a talented young drummer begins to pursue perfection at any cost, even his humanity.", 
     "release_date":"2014-10-10", 
     "genre_ids":[ 
      18, 
      10402 
     ], 
     "id":244786,       <------- Without "" = Integer 
     "original_title":"Whiplash",   <-------- With "" = String 
     "original_language":"en", 
     "title":"Whiplash", 
     "backdrop_path":"/6bbZ6XyvgfjhQwbplnUh1LSj1ky.jpg", 
     "popularity":7.361171, 
     "vote_count":1949, 
     "video":false, 
     "vote_average":8.32 
     } 
    ] 
} 

だから、あなたはのgetIntを使用する値を取得する（）あなたの質問で

finalobjectarray.setMovieId(object.getInt(MOVIE_ID).toString());

Answer 2

これが役立つ場合があります。 「ID」は文字列ではないので

finalobjectarray.setMovieId(""+object.getInt(MOVIE_ID));