Recyclerview適配器數據不會更改

我正在使用Recyclerview適配器將圖像放入Recyclerview中我的代碼邏輯是在解析它之後從JSON獲取圖像URL，然後適配器應將圖像放入Recyclerview中。的圖像URL取決於某些SharedPreferences，但問題是當SharedPreferences改變圖像不會隨之改變，他們只當我重新啓動應用程序更改Recyclerview適配器數據不會更改

我Recyclerview適配器：

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

public Context context; 
public ArrayList<MoviesData> array; 
public LayoutInflater inflater; 


RecyclerViewAdapter(Context context,ArrayList<MoviesData> array) 
{ 
    this.context = context; 
    this.array = array; 
    this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 



public class ViewHolder extends RecyclerView.ViewHolder { 

    ImageView image; 


    public ViewHolder(View itemView) { 
     super(itemView); 
     image = (ImageView) itemView.findViewById(R.id.oneMovieBlockImageView); 
    } 



} 

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

    View rootview = inflater.inflate(R.layout.movie_block,parent,false); 

    ViewHolder viewHolder = new ViewHolder(rootview); 

    return viewHolder; 
} 

@Override 
public void onBindViewHolder(ViewHolder holder, int position) { 

    Picasso.with(context).load(array.get(position).getPoster_path()).into(holder.image); 

} 

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

onPostExecute方法

@Override 
    protected void onPostExecute(ArrayList<MoviesData> result) { 
     if (result != null) { 

      recyclerView = (RecyclerView) getActivity().findViewById(R.id.recyclerview); 

      adapter = new RecyclerViewAdapter(getActivity(),moviesDatas); 
      recyclerView.setAdapter(adapter); 
      recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 



     } 
    }

這是圖像URL應該如何取決於SharedPreferences改變

if(sortByStr.equals("popular")) 
      { 
       url = new URL("http://api.themoviedb.org/3/movie/popular?api_key=9a005dd380ec772cf6045b8c370f8ef7"); 
      } 

      else if(sortByStr.equals("top_rated")) 
      { 
       url = new URL("http://api.themoviedb.org/3/movie/top_rated?api_key=9a005dd380ec772cf6045b8c370f8ef7"); 
      } 

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

我MoviesData類在那裏我收集裏面

public class MoviesData implements Parcelable{ 

MoviesData() 
{ 


} 

private String title,rate,release,overview,poster_path; 

protected MoviesData(Parcel in) { 
    title = in.readString(); 
    rate = in.readString(); 
    release = in.readString(); 
    overview = in.readString(); 
    poster_path = in.readString(); 
} 

public static final Creator<MoviesData> CREATOR = new Creator<MoviesData>() { 
    @Override 
    public MoviesData createFromParcel(Parcel in) { 
     return new MoviesData(in); 
    } 

    @Override 
    public MoviesData[] newArray(int size) { 
     return new MoviesData[size]; 
    } 
}; 

public void setTitle(String title) { 
    this.title = title; 
} 

public void setRate(String rate) { 
    this.rate = rate; 
} 

public void setRelease(String release) { 
    this.release = release; 
} 

public void setOverview(String overview) { 
    this.overview = overview; 
} 

public void setPoster_path(String poster_path) { 
    this.poster_path = "http://image.tmdb.org/t/p/w185" + poster_path; 
} 

//////////////////////////////////////////////////// 

public String getTitle() { 
    return title; 
} 

public String getRate() { 
    return rate; 
} 

public String getRelease() { 
    return release; 
} 

public String getOverview() { 
    return overview; 
} 

public String getPoster_path() { 
    return poster_path; 
} 

@Override 
public int describeContents() { 
    return 0; 
} 

@Override 
public void writeToParcel(Parcel dest, int flags) { 
    dest.writeString(title); 
    dest.writeString(rate); 
    dest.writeString(release); 
    dest.writeString(overview); 
    dest.writeString(poster_path); 
}}

而這個功能在哪裏設置的所有數據（包括圖片URL）中的所有數據MoviesData類

private ArrayList<MoviesData> getMoviesDataFromJson(String moviesJsonStr) throws JSONException 
    { 


     JSONObject forecastJson = new JSONObject(moviesJsonStr); 
     JSONArray moviesArray = forecastJson.getJSONArray("results"); 


     for(int i = 0; i <moviesArray.length(); i++) 
     { 


      JSONObject movieObject = moviesArray.getJSONObject(i); 


      MoviesData movie = new MoviesData(); 

      movie.setPoster_path(movieObject.getString("poster_path")); 
      movie.setTitle(movieObject.getString("title")); 
      movie.setOverview(movieObject.getString("overview")); 
      movie.setRate(movieObject.getString("vote_average")); 
      movie.setRelease(movieObject.getString("release_date")); 
      moviesDatas.add(movie); 

     } 


     return moviesDatas; 


    }

來源

2016-07-28 Ahmed El Sherif

嘗試內部調用：

adapter.notifyDataSetChanged();

之後致電getMoviesDataFromJson方法。

從notifyDataSetChanged文檔：

通知所附的觀察者的基礎數據已改變任何視圖反映了數據集應刷新本身。

希望它有幫助！

來源

2016-07-28 20:06:01 jos

我不知道爲什麼，但它似乎並沒有工作 –

你可以發佈代碼設置URL到MoviesData的代碼？ – jos

我已更新我的問題 –

移動將此代碼

recyclerView = (RecyclerView) getActivity().findViewById(R.id.recyclerview); 
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

onPostExecute從到onActivityCreated。在onPostExecute檢查適配器是否爲空。如果它是null創建它，但不是null刷新其數據。

if (adapter == null) { 
     adapter = new RecyclerViewAdapter(getActivity(), moviesDatas); 
     recyclerView.setAdapter(adapter); 
    } else { 
     adapter.setData(moviesDatas); 
     adapter.notifyDataSetChanged(); 
    }

你需要一個在RecyclerViewAdapter稱爲setData方法。

public void setData(ArrayList<MoviesData> array) { 
    this.array = array; 
}

P.S：不要忘記commit編輯SharedPreferences

來源

2016-07-29 08:22:17 faranjit

我做了這些改變，但仍然沒有運氣，這很奇怪，因爲當我使用GridView代替Recyclerview時，它確實工作得很好，也許問題出在我的Recyclerview適配器中？ –

順便說一句，它說：「沒有適配器連接;跳過佈局」在logcats –

你可以嘗試後更改此「Picasso.with（context）.load（array.get（position）.getPoster_path（））。（holder.image ）;」在onBindViewHolder到「ViewHolder viewHolder =（ViewHolder）持有者; Picasso.with（context）.load（array.get（position）.getPoster_path（））。into（viewHolder.image）;」 – faranjit

後初始化moviesDatas = new ArrayList<>();內getMoviesDataFromJson即使沒有notifyDataSetChanged 老實說後工作，我不知道爲什麼它的工作笑，沒有任何人有線索？

來源

2016-07-29 13:37:59

Recyclerview適配器數據不會更改

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