無法使用動態數據在RecyclerView中顯示項目

Question

我試圖展示一些從服務器獲取的數據但我無法在recyclerView中顯示提取的數據。數據有效並且解析（JSON解析）運行良好，但我的活動僅顯示白屏。 當我運行一些虛擬數據應用程序的應用程序工作正常時，當我嘗試設置從服務器解析的數據時，問題就到了。 這裏是我的MainClass

public class JSONDataViewer extends AppCompatActivity { 

    Context context; 
    // private List<Movie> movieList 
    private RecyclerView mRecyclerView; 
    private CustomAdapter mAdapter; 
    private List<MyData> dataList = new ArrayList<>(); 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_jsondata_viewer); 
     this.context = this; 
     AndroidNetworking.initialize(getApplicationContext()); 

     mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view); 
//  mRecyclerView.setHasFixedSize(true); 

//  loadDummyData(); 
     loadData(); 
     Log.e("DataListPopulated", "Data list populated"); 
     mAdapter = new CustomAdapter(dataList); 
     RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 
     mRecyclerView.setLayoutManager(mLayoutManager); 
     mRecyclerView.setItemAnimator(new DefaultItemAnimator()); 
     Log.e("SettingAdapter", "Setting Adapter"); 
     mRecyclerView.setAdapter(mAdapter); 
     Log.e("AdapterSet", "Adapter Set Success"); 
    } 

    private void loadDummyData() { 

     String question = "Question "; 
     int qNo = 1; 
     for (int i = 0; i < 10; i++) { 
      qNo++; 
      MyData data = new MyData("" + qNo, question + qNo); 
      Log.e("Question" + " " + qNo, 
        "\nQuestion id = " + data.getQuestionId() + 
          " Question text = " + data.getQuestionText()); 
      dataList.add(data); 

     } 
    } 

    private void loadData() { 
     AndroidNetworking.post("http://www.skafs.com/survey/api/index.php") 
       .addBodyParameter("tag", "getquestion") 
       .addBodyParameter("category_id", "2") 
       .setPriority(Priority.MEDIUM) 
       .build() 
       .getAsJSONObject(new JSONObjectRequestListener() { 
        @Override 
        public void onResponse(JSONObject response) { 
         Log.i("LoadingData", "" + "Successful" + response); 
         Toast.makeText(context, "Response:\n" + "Loading Data" + response, 
           Toast.LENGTH_LONG).show(); 
         boolean success = response.optBoolean("success"); 
         if (success) { 
          Log.e("InsideSuccess", "Success = " + success); 
          try { 
           JSONArray questions = 
             response.optJSONArray("questions"); 
           Log.e("Questions", questions.toString()); 
           for (int i = 0; i < questions.length(); i++) { 
            JSONObject obj = questions.getJSONObject(i); 
            MyData data = new MyData(
              obj.getString("question_id"), 
              obj.getString("question_text")); 
            Log.e("Question" + " " + i, 
              "\nQuestion id = " + data.getQuestionId() + 
                " Question text = " + data.getQuestionText()); 
            dataList.add(data); 
           } 
           Log.e("ListData", "List Size is = "+dataList.size()); 
          } catch (JSONException e) { 
           e.printStackTrace(); 
          } 
         } 
        } 

        @Override 
        public void onError(ANError anError) { 
         anError.printStackTrace(); 
         Log.e("ParsingJSON", "" + "Failed getting json"); 
        } 
       }); 
    } 
} 

你可以看到有兩種方法上面的代碼loadDummyData();和loadData();與第1種方法嘗試沒有問題。
我有一些日誌報表顯示來自服務器的數據是有效的，DataList控件有9 這裏大小是形成我的數據登錄

10-17 21:25:25.217 3078-3078/hostflippa.com.opencart_android E/InsideSuccess: Success = true 
10-17 21:25:25.219 3078-3078/hostflippa.com.opencart_android E/Questions: [{"question_id":"1","question_text":"License Status","question_type":"radio","options":[{"option_id":"1","option_text":"Valid","option_value":"5"},{"option_id":"2","option_text":"Expired","option_value":"0"},{"option_id":"3","option_text":"Without License","option_value":"0"}]},{"question_id":"2","question_text":"License date of validity","question_type":"editText","options":[]},{"question_id":"3","question_text":"Type of License","question_type":"radio","options":[{"option_id":"4","option_text":"A-Category","option_value":"5"},{"option_id":"5","option_text":"B-Category","option_value":"2"},{"option_id":"6","option_text":"C-Category","option_value":"2"},{"option_id":"7","option_text":"Dispensar","option_value":"1"},{"option_id":"457","option_text":"20\/21","option_value":"1"}]},{"question_id":"4","question_text":"License Ownership","question_type":"radio","options":[{"option_id":"8","option_text":"Individual","option_value":"0"},{"option_id":"9","option_text":"Chain Pharmacy","option_value":"0"},{"option_id":"10","option_text":"Company","option_value":"0"}]},{"question_id":"5","question_text":"License Number","question_type":"editText","options":[]},{"question_id":"6","question_text":"Computerized License No","question_type":"editText","options":[]},{"question_id":"7","question_text":"NTN Present","question_type":"checkbox","options":[{"option_id":"11","option_text":"Yes","option_value":"1"},{"option_id":"12","option_text":"No","option_value":"0"}]},{"question_id":"8","question_text":"NTN No.","question_type":"editText","options":[]},{"question_id":"9","question_text":"Visit Type","question_type":"radio","options":[{"option_id":"13","option_text":"First visit","option_value":"0"},{"option_id":"14","option_text":"Second visit","option_value":"0"}]}] 
10-17 21:25:25.219 3078-3078/hostflippa.com.opencart_android E/Question 0: Question id = 1 Question text = License Status 
10-17 21:25:25.219 3078-3078/hostflippa.com.opencart_android E/Question 1: Question id = 2 Question text = License date of validity 
10-17 21:25:25.220 3078-3078/hostflippa.com.opencart_android E/Question 2: Question id = 3 Question text = Type of License 
10-17 21:25:25.220 3078-3078/hostflippa.com.opencart_android E/Question 3: Question id = 4 Question text = License Ownership 
10-17 21:25:25.220 3078-3078/hostflippa.com.opencart_android E/Question 4: Question id = 5 Question text = License Number 
10-17 21:25:25.220 3078-3078/hostflippa.com.opencart_android E/Question 5: Question id = 6 Question text = Computerized License No 
10-17 21:25:25.221 3078-3078/hostflippa.com.opencart_android E/Question 6: Question id = 7 Question text = NTN Present 
10-17 21:25:25.221 3078-3078/hostflippa.com.opencart_android E/Question 7: Question id = 8 Question text = NTN No. 
10-17 21:25:25.221 3078-3078/hostflippa.com.opencart_android E/Question 8: Question id = 9 Question text = Visit Type 
10-17 21:25:25.221 3078-3078/hostflippa.com.opencart_android E/ListData: List Size is = 9 

請點我，我做錯了方向。

我是沒有得到任何異常。這裏是我CustomAdapter類

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.MyViewHolder> { 

    private List<MyData> dataList; 

    public CustomAdapter(List<MyData> dataList) { 
     this.dataList = dataList; 
     Log.e("Constructor", "Working"); 
     Log.e("Constructor", "DataList Size = " + dataList.size()); 
    } 

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

     View itemView = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.card_lay, parent, false); 
     Log.e("LayoutInflated", "Working"); 

     return new MyViewHolder(itemView); 
    } 

    @Override 
    public void onBindViewHolder(MyViewHolder holder, int position) { 
     Log.e("OnBIndMethod", "OnBind Working"); 
     MyData data = dataList.get(position); 
     holder.questionId.setText(data.getQuestionId()); 
     holder.questionText.setText(data.getQuestionText()); 
    } 

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

    public class MyViewHolder extends RecyclerView.ViewHolder { 

     public TextView questionId, questionText; 

     public MyViewHolder(View itemView) { 
      super(itemView); 
      questionId = (TextView) itemView.findViewById(R.id.question_id); 
      questionText = (TextView) itemView.findViewById(R.id.question_text); 
      Log.e("FindViewById", "Working"); 
     } 
    } 
} 

MyData類有字符串類型和他們的getter/setter方法的兩個領域。

Answer 1

for (int i = 0; i < questions.length(); i++) { 
           JSONObject obj = questions.getJSONObject(i); 
           MyData data = new MyData(
             obj.getString("question_id"), 
             obj.getString("question_text")); 
           Log.e("Question" + " " + i, 
             "\nQuestion id = " + data.getQuestionId() + 
               " Question text = " + data.getQuestionText()); 
           dataList.add(data); 
          } 
// notify data set change call missing 
mAdapter.notifyDataSetChanged();