的JSONObject不能轉換爲jsonArray

Question

始終顯示警告是

E/RecyclerView: No adapter attached; skipping layout 

當我想實現內部片段 回收站視圖，並顯示錯誤是

W/System.err: com.android.volley.ParseError: org.json.JSONException: Value 

{"Sales_Report":[{"id":"1","cash":"258","credit":"258","description":"","dates":"Nov-09-2016","camimg_path":""},{"id":"2","cash":"532","credit":"586","description":"","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"3","cash":"214","credit":"980","description":"th","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"4","cash":"123","credit":"321","description":"erp","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"15","cash":"5","credit":"8","description":"5","dates":"Nov-09-2016","camimg_path":"Gallery_images\/galimg2016-11-09T14:44:21.483+05302516.jpeg"},{"id":"14","cash":"2","credit":"3","description":"","dates":"Nov-09-2016","camimg_path":"..\/Gallery_images\/galimg2016-11-09T14:42:56.857+05302620.jpeg"}]} of type org.json.JSONObject cannot be converted to JSONArray 
W/System.err:  at com.android.volley.toolbox.JsonArrayRequest.parseNetworkResponse(JsonArrayRequest.java:55) 
W/System.err:  at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:121) 
W/System.err: Caused by: org.json.JSONException: Value {"Sales_Report":[{"id":"1","cash":"258","credit":"258","description":"","dates":"Nov-09-2016","camimg_path":""},{"id":"2","cash":"532","credit":"586","description":"","dates":"Nov-09-2016","camimg_path":"Gallery_images\/Test_gl.jpeg"},{"id":"3","cash":"214","credit":"980","description":"th","dates":"Nov-09-  2016","camimg_path":"Gallery_images\/Test_gl.jpeg"}, {"id":"4","cash":"123","credit":"321","description":"erp","dates":"Nov-09- 2016","camimg_path":"Gallery_images\/Test_gl.jpeg"}, {"id":"15","cash":"5","credit":"8","description":"5","dates":"Nov-09- 2016","camimg_path":"Gallery_images\/galimg2016-11- 09T14:44:21.483+05302516.jpeg"}, {"id":"14","cash":"2","credit":"3","description":"","dates":"Nov-09- 2016","camimg_path":"..\/Gallery_images\/galimg2016-11- 09T14:42:56.857+05302620.jpeg"}]} of type org.json.JSONObject cannot be  converted to JSONArray 
    W/System.err:  at org.json.JSON.typeMismatch(JSON.java:111) 
    W/System.err:  at org.json.JSONArray.<init>(JSONArray.java:96) 
    W/System.err:  at org.json.JSONArray.<init>(JSONArray.java:108) 
    /System.err:  at com.android.volley.toolbox.JsonArrayRequest.parseNetworkResponse(JsonArrayReques  t.java:50) 

幫我... 。 這是我fragment.java

public class MessageFragment extends Fragment { 
private List<Content> listSuperHeroes; 

//Creating Views 
private RecyclerView recyclerView; 
private RecyclerView.LayoutManager layoutManager; 
private RecyclerView.Adapter adapter; 

public MessageFragment() { 
    // Required empty public constructor 
} 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View v= inflater.inflate(R.layout.fragment_message, container, false); 
    recyclerView = (RecyclerView) v.findViewById(R.id.recyclerView); 
    recyclerView.setHasFixedSize(true); 
    layoutManager = new LinearLayoutManager(getActivity()); 
    recyclerView.setLayoutManager(layoutManager); 



    //Adding adapter to recyclerview 

    listSuperHeroes = new ArrayList<>(); 

    //Calling method to get data 
    getData(); 
    return v; 
} 
private void getData(){ 
    //Showing a progress dialog 
    // final ProgressDialog loading = ProgressDialog.show(getActivity(),"Loading Data", "Please wait...",false,false); 

    //Creating a json array request 

    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL, 
      new Response.Listener<JSONArray>() { 


       @Override 
       public void onResponse(JSONArray response) { 
        //Dismissing progress dialog 
        // loading.dismiss(); 

        //calling method to parse json array 
        parseData(response); 
       } 
      }, 
      new Response.ErrorListener() { 
       @Override 
       public void onErrorResponse(VolleyError error) { 

       } 
      }); 

    //Creating request queue 
    RequestQueue requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext()); 

    //Adding request to the queue 
    requestQueue.add(jsonArrayRequest); 
} 

private void parseData(JSONArray array){ 
    for(int i = 0; i<array.length(); i++) { 
     Content superHero = new Content(); 
     JSONObject json = null; 
     try { 
      json = array.getJSONObject(i); 
      superHero.setImageUrl(json.getString(Config.TAG_IMAGE_URL)); 
      superHero.setName(json.getString(Config.TAG_NAME)); 
      superHero.setRank(json.getInt(Config.TAG_RANK)); 
      superHero.setRealName(json.getString(Config.TAG_REAL_NAME)); 
      superHero.setCreatedBy(json.getString(Config.TAG_CREATED_BY)); 
      superHero.setFirstAppearance(json.getString(Config.TAG_FIRST_APPEARANCE)); 

      ArrayList<String> powers = new ArrayList<String>(); 

      JSONArray jsonArray = json.getJSONArray(Config.TAG_POWERS); 

      for(int j = 0; j<jsonArray.length(); j++){ 
       powers.add(((String) jsonArray.get(j))+"\n"); 
      } 
      superHero.setPowers(powers); 


     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 
     listSuperHeroes.add(superHero); 
    } 
    adapter = new CardAdapter(listSuperHeroes, getActivity()); 
    //Finally initializing our adapter 
    recyclerView.setAdapter(adapter); 

} 
} 

這裏是我Cardadapter.java班組長

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

private ImageLoader imageLoader; 
private Context context; 

//List of superHeroes 
List<Content> superHeroes; 

public CardAdapter(List<Content> superHeroes, Context context){ 
    super(); 
    //Getting all the superheroes 
    this.superHeroes = superHeroes; 
    this.context = context; 
} 

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

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

    Content superHero = superHeroes.get(position); 

    imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader(); 
    imageLoader.get(superHero.getImageUrl(),  ImageLoader.getImageListener(holder.imageView, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert)); 

    holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader); 
    holder.textViewName.setText(superHero.getName()); 
    holder.textViewRank.setText(String.valueOf(superHero.getRank())); 
    holder.textViewRealName.setText(superHero.getRealName()); 
    holder.textViewCreatedBy.setText(superHero.getCreatedBy()); 
    holder.textViewFirstAppearance.setText(superHero.getFirstAppearance()); 

    String powers = ""; 

    for(int i = 0; i<superHero.getPowers().size(); i++){ 
     powers+= superHero.getPowers().get(i); 
    } 

    holder.textViewPowers.setText(powers); 
} 

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

class ViewHolder extends RecyclerView.ViewHolder{ 
    public NetworkImageView imageView; 
    public TextView textViewName; 
    public TextView textViewRank; 
    public TextView textViewRealName; 
    public TextView textViewCreatedBy; 
    public TextView textViewFirstAppearance; 
    public TextView textViewPowers; 

    public ViewHolder(View itemView) { 
     super(itemView); 
     imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero); 
     textViewName = (TextView) itemView.findViewById(R.id.textViewName); 
     textViewRank= (TextView) itemView.findViewById(R.id.textViewRank); 
     textViewRealName= (TextView) itemView.findViewById(R.id.textViewRealName); 
     textViewCreatedBy= (TextView) itemView.findViewById(R.id.textViewCreatedBy); 
     textViewFirstAppearance= (TextView) itemView.findViewById(R.id.textViewFirstAppearance); 
     textViewPowers= (TextView) itemView.findViewById(R.id.textViewPowers); 
    } 
} 
} 

請幫我找到這個代碼的問題，以及如何解決這個問題？在此先感謝。

Answer 1

你所得到的錯誤後爲此在OnResponse（），因爲當RecyclerView是VISIBLE它沒有適配器。

當前您在Fragment的parseData()方法中設置了Adapter。 AFAIK沒有缺點不是設置Adapter（只是發出警告錯誤）。但是，如果你不想要它，那麼你可以在onCreateView()添加適配器像這樣

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View v= inflater.inflate(R.layout.fragment_message, container, false); 
    recyclerView = (RecyclerView) v.findViewById(R.id.recyclerView); 

    // your code 

    listSuperHeroes = new ArrayList<>(); 
    adapter = new CardAdapter(listSuperHeroes, getActivity()); 

    // Set adapter here so you don't get warning. 
    recyclerView.setAdapter(adapter); 

    // your code 

    return v; 
} 

，然後在parseData()方法簡單地通知數據已經改變了Adapter。

private void parseData(JSONArray array) { 

    // Your code for parsing 

    // Notify the adapter that data has changed and the Adapter will populate RecyclerView accordingly. 
    adapter.notifyDataSetChanged(); 
} 

Answer 2

移動這個代碼下面的getData（）

adapter = new CardAdapter(listSuperHeroes, getActivity()); 
    recyclerView.setAdapter(adapter); 

然後parseData（）

 adapter .notifyDataSetChanged();