RecyclerViewでJSON応答を取得できません

Question

RecyclerViewにJSON応答を取得したいとします。私は使用したREST APIを通して正しい応答を得ていますが、応答は解析後にRecyclerViewには到着しません。以下はコードです。助けてください ！！

RepoActivity.java

 public class RepoActivity extends AppCompatActivity { 

      private static final String TAG = MainActivity.class.getSimpleName(); 
      private ProgressDialog pDialog; 
      private List<RepoList> repoList = new ArrayList<>(); 
      String data = ""; 
      private RecyclerView recyclerView; 
      private static String url; 
      private RepoAdapter adapter; 
      RequestQueue requestQueue; 


      @Override 
      protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.activity_repo); 

       recyclerView = (RecyclerView) findViewById(R.id.recycler_view); 
       Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
       setSupportActionBar(toolbar); 

       Bundle bundle = getIntent().getExtras(); 
       String message = bundle.getString("message"); 
       adapter = new RepoAdapter(repoList); 
       RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 
       recyclerView.setLayoutManager(mLayoutManager); 
       recyclerView.setItemAnimator(new DefaultItemAnimator()); 



       url = "https://api.github.com/users/" + message + "/repos"; 
       parsingMethod(); 
      } 

      private void parsingMethod() { 

       Log.d("hello1", url); 
       pDialog = new ProgressDialog(this); 
       // Showing progress dialog 
       pDialog.setMessage("Loading..."); 
       pDialog.show(); 

       // Creating volley request obj 
       JsonArrayRequest cityReq = new JsonArrayRequest(url, 
         new Response.Listener<JSONArray>() { 

          @Override 
          public void onResponse(JSONArray jsonArray) { 
           hidePDialog(); 

           // Parsing json 
           for (int i = 0; i < jsonArray.length(); i++) { 

            JSONObject obj = null; 
            try { 
             obj = jsonArray.getJSONObject(i); 
            } catch (JSONException e) { 
             e.printStackTrace(); 
            } 

            RepoList repoList = new RepoList(); 
            try { 

             repoList.setRepoName(obj.getString("name")); 
             Log.d("zxcv",obj.getString("name")); 
             repoList.setRepoDesc(obj.getString("description")); 
             Log.d("zxcv",obj.getString("description")); 
            } catch (JSONException e) { 
             e.printStackTrace(); 
            } 

           } 
           recyclerView.setAdapter(adapter); 

          } 

         },new Response.ErrorListener() 

       { 
        @Override 
        public void onErrorResponse (VolleyError error){ 
         VolleyLog.d(TAG, "Error: " + error.getMessage()); 
         hidePDialog(); 

        } 

       }); 


       // Adding request to request queue 
       AppController.getInstance().addToRequestQueue(cityReq); 
      } 

      @Override 
      public void onDestroy() { 
       super.onDestroy(); 
       hidePDialog(); 
      } 

      private void hidePDialog() { 
       if (pDialog != null) { 
        pDialog.dismiss(); 
        pDialog = null; 
       } 
      } 
     } 

RepoAdapter.java

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

      private List<RepoList> repoLists; 


      @Override 
      public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
       View itemView = LayoutInflater.from(parent.getContext()) 
         .inflate(R.layout.repo_list_row, parent, false); 

       return new MyViewHolder(itemView); 
      } 

      @Override 
      public void onBindViewHolder(MyViewHolder holder, int position) { 
       RepoList repoList = repoLists.get(position); 
       holder.repoName.setText(repoList.getRepoName()); 
       holder.repoDesc.setText(repoList.getRepoDesc()); 
      } 

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

      public class MyViewHolder extends RecyclerView.ViewHolder { 
       public TextView repoName, repoDesc; 

       public MyViewHolder(View view) { 
        super(view); 
        repoName = (TextView) view.findViewById(R.id.repoName); 
        repoDesc = (TextView) view.findViewById(R.id.repoDesc); 
       } 
      } 

      public RepoAdapter(List<RepoList> repoList) { 
       this.repoLists = repoList; 
      } 

     } 

RepoList.java

  package com.example.lenovo.boxme; 

     /** 
     * Created by lenovo on 16-12-2016. 
     */ 

     public class RepoList { 

      private String repoName,repoDesc; 

      public RepoList(String repoDesc, String repoName) { 
       this.repoDesc = repoDesc; 
       this.repoName = repoName; 
      } 

      public RepoList(){}; 

      public String getRepoDesc() { 
       return repoDesc; 
      } 

      public void setRepoDesc(String repoDesc) { 
       this.repoDesc = repoDesc; 
      } 

      public String getRepoName() { 
       return repoName; 
      } 

      public void setRepoName(String repoName) { 
       this.repoName = repoName; 
      } 
     } 

Answer 1

adapter = new RepoAdapter(repoList); 
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 
    recyclerView.setLayoutManager(mLayoutManager); 
    recyclerView.setItemAnimator(new DefaultItemAnimator()); 
    recyclerView.setAdapter(adapter); 

//リスト項目が

を変更した後にデータセットを通知します

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

           JSONObject obj = null; 
           try { 
            obj = jsonArray.getJSONObject(i); 
           } catch (JSONException e) { 
            e.printStackTrace(); 
           } 

           RepoList repo= new RepoList(); 
           try { 

            repo.setRepoName(obj.getString("name")); 
            Log.d("zxcv",obj.getString("name")); 
            repo.setRepoDesc(obj.getString("description")); 
            Log.d("zxcv",obj.getString("description")); 
            repoList.add(repo);//you missed 
           } catch (JSONException e) { 
            e.printStackTrace(); 
           } 

          } 
      adapter.notifyDataSetChange(); 

Answer 2

あなたは、アダプタ

adapter = new RepoAdapter(repoList);

を作成するときにrepoListに渡していたが、その後

... setAdapter

RepoList repoList = new RepoList();

を呼び出す前に、新しいリストを移入/作成しています

recyclerView.setAdapter(adapter);

Answer 3

この行を削除します。

RepoList repoList = new RepoList(); 

のonCreate

recyclerView.setAdapter(adapter); 

とデータコールフェッチした後に、この行を入れて：

adapter.notifyDataSetChange()