Recyclerview适配器数据不会更改

问题描述：

我正在使用Recyclerview适配器将图像放入Recyclerview中我的代码逻辑是在解析它之后从JSON获取图像URL，然后适配器应将图像放入Recyclerview中。的图像URL取决于某些SharedPreferences，但问题是当SharedPreferences改变图像不会随之改变，他们只当我重新启动应用程序更改Recyclerview适配器数据不会更改

我Recyclerview适配器：

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())); 



     } 
    }

这是图像URL应该如何取决于SharedPreferences改变

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类在那里我收集里面

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); 
}}

而这个功能在哪里设置的所有数据（包括图片URL）中的所有数据MoviesData类

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; 


    }

答

尝试内部调用：

adapter.notifyDataSetChanged();

之后致电getMoviesDataFromJson方法。

从notifyDataSetChanged文档：

通知所附的观察者的基础数据已改变任何视图反映了数据集应刷新本身。

希望它有帮助！

我不知道为什么，但它似乎并没有工作 –

你可以发布代码设置URL到MoviesData的代码？ – jos

我已更新我的问题 –

答

移动将此代码

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

onPostExecute从到onActivityCreated。在onPostExecute检查适配器是否为空。如果它是null创建它，但不是null刷新其数据。

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

你需要一个在RecyclerViewAdapter称为setData方法。

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

P.S：不要忘记commit编辑SharedPreferences

我做了这些改变，但仍然没有运气，这很奇怪，因为当我使用GridView代替Recyclerview时，它确实工作得很好，也许问题出在我的Recyclerview适配器中？ –

顺便说一句，它说：“没有适配器连接;跳过布局”在logcats –

你可以尝试后更改此“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

答

后初始化moviesDatas = new ArrayList<>();内getMoviesDataFromJson即使没有notifyDataSetChanged 老实说后工作，我不知道为什么它的工作笑，没有任何人有线索？

Recyclerview适配器数据不会更改

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