提取新数据后通知适配器

Question

我有一个适配器，它不会在通过改装获取新数据后得到通知，但是，我使用notifyDataSetChanged并在日志中获得成功，但是没有任何工作:( 另外我尝试使用本地阵列与此适配器和它的伟大工程

public class alberrClassNews extends Fragment { 

    private RecyclerView recyclerView; 
    private List<alberrNewsListContent> alberrNews = new ArrayList<alberrNewsListContent>(); 
    private final String TAG = "Get JSONArray"; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.alberrnewsclass, container, false); 
     getActivity().setTitle("nnnn"); 

     recyclerView = (RecyclerView) view.findViewById(R.id.alberrNewsList); 

     LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity()); 
     recyclerView.setLayoutManager(layoutManager); 
     layoutManager.setReverseLayout(true); 
     layoutManager.setStackFromEnd(true); 

     final alberrNewsAdapter aNA = new alberrNewsAdapter(getActivity(), alberrNews); 
     recyclerView.setAdapter(aNA); 


     final ProgressDialog progressDialog = new ProgressDialog(getActivity()); 
     progressDialog.setMessage("loading"); 
     progressDialog.show(); 

     final Retrofit alberrRetrofit = new Retrofit.Builder() 
       .baseUrl("http://nn.com/abbn/") 
       .addConverterFactory(GsonConverterFactory.create()).build(); 
     alberrService service = alberrRetrofit.create(alberrService.class); 


     Call<JSONArray> call = service.alberrNews(); 
     call.enqueue(new Callback<JSONArray>() { 
      @Override 
      public void onResponse(Call<JSONArray> call, Response<JSONArray> response) { 
       progressDialog.dismiss(); 
       Log.i(TAG, "success"); 

       try{ 
        JSONArray jsonArray = response.body().getJSONArray(0); 
        for (int i = 0 ; i < jsonArray.length() ; i++){ 
         JSONObject jsonObject = jsonArray.getJSONObject(i); 
         alberrNewsListContent newsContent = new alberrNewsListContent(); 

         newsContent.setAlberrNewsTitle(jsonObject.getString("title")); 
         newsContent.setAlberrNewsSubject(jsonObject.getString("subject")); 
         newsContent.setAlberrNewsImage(jsonObject.getString("image")); 
         alberrNews.add(newsContent); 
        } 

       } catch (JSONException e){ 
        e.printStackTrace(); 
       } 

       aNA.notifyDataSetChanged(); 
      } 

      @Override 
      public void onFailure(Call<JSONArray> call, Throwable t) { 
       Log.i(TAG, "Failed"); 
       progressDialog.dismiss(); 

       Toast.makeText(getActivity().getApplicationContext(), 
        "no connection", Toast.LENGTH_SHORT).show(); 
      } 
     }); 
     return view; 
    } 

适配器类别通过公共方法

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

     private List<alberrNewsListContent> newsListContent; 
     private Context context; 

     public alberrNewsAdapter(Context ncontext , List<alberrNewsListContent> nnewsListContent){ 
      this.context = ncontext; 
      this.newsListContent = nnewsListContent; 
     } 

     @Override 
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
      View view = LayoutInflater 
       .from(parent.getContext()) 
       .inflate(R.layout.alberrnewscontent, parent, false); 
      return new ViewHolder(view); 
     } 

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

      final alberrNewsListContent newsContent = newsListContent.get(position); 

      holder.alberrNewsTitle.setText(newsContent.getAlberrNewsTitle()); 
      holder.alberrNewsSubject.setText(newsContent.getAlberrNewsSubject()); 

      Glide.with(context) 
       .load(newsContent.getAlberrNewsImage()) 
       .override(300, 260) 
       .into(holder.alberrNewsImage); 
     } 

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


     public void replaceDataSet(List<alberrNewsListContent> alberrNews){ 
      this.newsListContent = alberrNews; 
      notifyDataSetChanged(); 

     } 

     public static class ViewHolder extends RecyclerView.ViewHolder{ 

      TextView alberrNewsTitle; 
      TextView alberrNewsSubject; 
      ImageView alberrNewsImage; 
      CardView alberrNewsCardView; 

      public ViewHolder(View itemView) { 
       super(itemView); 

       alberrNewsTitle = (TextView)itemView.findViewById(R.id.alberrNewsTitle); 
       alberrNewsSubject = (TextView)itemView.findViewById(R.id.alberrNewsSubject); 
       alberrNewsImage = (ImageView)itemView.findViewById(R.id.alberrNewsImage); 
       alberrNewsCardView = (CardView)itemView.findViewById(R.id.alberrNewsCardView); 
      } 
     } 
    } 

Answer 1

通过新的列表内容适配器和调用notifyDataSetChanged（）;这种方法里面，您目前”不要更新t中的列表他适配器。

Answer 2

在您的alberrNewsAdapter中，您可以创建一个名为replaceDataSet()的新方法，该方法将替换适配器中的数据集并呼叫notifyDataSetChanged()。

private List<alberrNewsListContent> alberrNews alberrNews; 


public void replaceDataSet(List<alberrNewsListContent> alberrNews){ 
    this.alberrNews = alberrNews; 
    notifyDataSetChanged(); 

} 

而且在不是调用aNA.notifyDataSetChanged();呼叫aNA.replaceDataSet();