RecycleView adaptateur affiché dans ArrayList avec des données JSON

Question

Je suis en train de créer un Adapter pour RecyclerView affiché dans ArrayList mais je question sur RecyclerViewHolder publique dans le fond du code. Dois-je utiliser ArrayList dans, ou faire comme le code ci-dessous:

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> { 

    private static final String TAG = RecyclerViewAdapter.class.getSimpleName(); 
    ArrayList<MovieItem> mMoviesItems; 
    private Context context; 

    public RecyclerViewAdapter(ArrayList<MovieItem> MoviesItems) { 
     mMoviesItems = MoviesItems; 
    } 

    @Override 
    public RecyclerViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { 
     context = viewGroup.getContext(); 
     int layoutIdForListItem = R.layout.movie_list_item; 
     LayoutInflater inflater = LayoutInflater.from(context); 
     boolean shouldAttachToParentImmediately = false; 

     View view = inflater.inflate(layoutIdForListItem, viewGroup, shouldAttachToParentImmediately); 
     RecyclerViewHolder viewHolder = new RecyclerViewHolder(view); 

     return viewHolder; 
    } 

    @Override 
    public void onBindViewHolder(RecyclerViewHolder holder, int position) { 
     holder.MoviePopularity.setText(mMoviesItems.get(position).getPopularity(popularity)); 
     Picasso.with(this.context).load(mMoviesItems.get(position).getPhoto(poster_path)).into(holder.MoviePoster); 
     holder.MovieName.setText(mMoviesItems.get(position).getName(original_title)); 
    } 

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

    class RecyclerViewHolder extends RecyclerView.ViewHolder { 

     TextView MoviePopularity; 
     ImageView MoviePoster; 
     TextView MovieName; 

     public RecyclerViewHolder(View itemView) { 
      super(itemView); 
      MoviePopularity = (TextView)itemView.findViewById(R.id.movie_popularity); 
      MoviePoster = (ImageView)itemView.findViewById(R.id.iv_item_movie); 
      MovieName = (TextView)itemView.findViewById(R.id.movie_name); 
     } 
    } 
} 

J'ai aussi un problème avec onBindViewHolder() j'obtiens l'erreur sous poster_path, original_title et la popularité

Ceci est mon code de classe personnalisée:

public class MovieItem { 
    private double popularity; 
    private String photo; 
    private String name; 

    public MovieItem(double popularity, String poster_path, String original_title) { 
     this.popularity = this.popularity; 
     this.photo = photo; 
     this.name = name; 
    } 

    public double getPopularity(double popularity) { return popularity; } 
    public String getPhoto() { return photo; } 
    public String getName() { 
     return name; 
    } 
} 

Et la classe de données Json:

public final class OpenMovieJsonUtils { 

    public static ArrayList<MovieItem> getSimpleMovieStringsFromJson(Context context, String moviesJsonString) 
      throws JSONException { 

     final String RESULTS = "results"; 
     final String POPULARITY = "popularity"; 
     final String POSTER_PATH = "poster_path"; 
     final String ORIGINAL_TITLE = "original_title"; 

     ArrayList<MovieItem> parsedMovieData = new ArrayList<MovieItem>(); 

     JSONObject moviesObject = new JSONObject(moviesJsonString); 
     JSONArray moviesArray = moviesObject.getJSONArray(RESULTS); 

     for (int i = 0; i < moviesArray.length(); i++) { 
      double popularity; 
      String poster_path; 
      String original_title; 

      moviesObject = moviesArray.getJSONObject(i); 

      popularity = moviesObject.getDouble(POPULARITY); 
      poster_path = moviesObject.getString(POSTER_PATH); 
      original_title = moviesObject.getString(ORIGINAL_TITLE); 

      parsedMovieData.add(new MovieItem(popularity, poster_path, original_title)); 

     } 

     return parsedMovieData; 
    } 
} 

Answer 1

Vous initialisez votre champ de popularité au même champ global de sorte que son par défaut toujours null .also changer votre getter method.Change Votre classe MovieItem comme ceci:

public class MovieItem { 
private double popularity; 
private String photo; 
private String name; 

public MovieItem(double popularity, String poster_path, String original_title) { 
    this.popularity = popularity; 
    this.photo = photo; 
    this.name = name; 
} 

public double getPopularity() { return popularity; } 
public String getPhoto() { return photo; } 
public String getName() { return name; } 

changer maintenant votre méthode de onBindViewHolder comme thhis:

@Override 
public void onBindViewHolder(RecyclerViewHolder holder, int position) { 
    holder.MoviePopularity.setText(String.valueOf(mMoviesItems.g‌​et(position).getPopu‌​larity())); 
    Picasso.with(this.context).load(mMoviesItems.get(position).getPhoto()).into(holder.MoviePoster); 
    holder.MovieName.setText(mMoviesItems.get(position).getName()); 
}