Volleyを使用してフラグメント内にカスタムレイアウトのListViewを挿入する

Question

私は自分のアプリ内にナビゲーションドロワーを持っています。私はボレーを介して配置されたカスタムレイアウトのlistViewを表示したいと思います。 **コードでエラーは表示されませんが、リストビューにはエントリがありません。**誰でもエラーの内容を教えていただけますか？私は何を間違えているのですか？ フラグメントのコードです。

package com.example.vishal.navtest2; 


import android.annotation.SuppressLint; 
import android.content.Intent; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v7.widget.RecyclerView; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.BaseAdapter; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 
import android.widget.Toast; 

import com.android.volley.Request; 
import com.android.volley.RequestQueue; 
import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.JsonObjectRequest; 
import com.android.volley.toolbox.StringRequest; 
import com.android.volley.toolbox.Volley; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.List; 


/** 
* A simple {@link Fragment} subclass. 
*/ 




public class BlankFragment extends Fragment { 


    public BlankFragment() { 
     // Required empty public constructor 
    } 


    RequestQueue requestQueue; 
    String reqUrl = "http://192.168.1.7/Tutorial/requestGetTry.php"; 

    final List<String> requestNoList = new ArrayList<String>(); 
    final List<String> requestDescriptionList = new ArrayList<String>(); 
    final List<String> dateList = new ArrayList<String>(); 
    final List<String> statusList = new ArrayList<String>(); 
    String[] menuItems = {"item 1","Item 2","Item 3","item 1","Item 2","Item 3","item 1","Item 2","Item 3","item 1","Item 2","Item 3",}; 

    String disp = ""; 
    int len ; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 


     final View view = inflater.inflate(R.layout.fragment_blank, container, false); 

     requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext()); 
     ListView listView = (ListView) view.findViewById(R.id.listView); 

//  String[] reqDetPass = new String[5]; 


     JsonObjectRequest req = new JsonObjectRequest(Request.Method.POST, reqUrl, null, new Response.Listener<JSONObject>() { 
      @Override 
      public void onResponse(JSONObject response) { 

       try { 
        JSONArray requests = response.getJSONArray("request"); 
        len = requests.length(); 
        for(int i = 0; i < requests.length(); i++){ 
         JSONObject request = requests.getJSONObject(i); 
         String no = request.getString("requestno"); 
         String desc = request.getString("description"); 
         String date = request.getString("date"); 
         String status = request.getString("status"); 

         Toast.makeText(getActivity(), no+desc+date+status, Toast.LENGTH_SHORT).show(); 

         requestNoList.add(no); 
         requestDescriptionList.add(desc); 
         dateList.add(date); 
         statusList.add(status); 

         disp = disp + requestNoList.get(i); 



        } 
        //Toast.makeText(getActivity(), "Disp: "+disp, Toast.LENGTH_SHORT).show(); 

        if(requestNoList == null){ 
         Toast.makeText(getActivity(), "Null In ReqList", Toast.LENGTH_SHORT).show(); 
        } 

        ListView listView = (ListView) view.findViewById(R.id.listView); 



        CustomAdapter customAdapter = new CustomAdapter(); 

        String[] stringArray = requestNoList.toArray(new String[0]); 
        String[] dummy = {"Item 1","Item 2","Item 3","Item 4","Item 5","Item 6","Item 7","Item 8","Item 9","Item 10","Item 11",}; 

        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, stringArray); 

        final ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, dummy); 

        listView.setAdapter(customAdapter); 

        Toast.makeText(getContext(), String.valueOf(requestDescriptionList.toArray()[0]), Toast.LENGTH_LONG).show(); 

        customAdapter.notifyDataSetChanged(); 


       } catch (JSONException e) { 
        e.printStackTrace(); 
        //requestNoList.add(e.toString()); 
        Toast.makeText(getActivity(), e.toString(), Toast.LENGTH_SHORT).show(); 
       } 


      } 
     }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       //requestNoList.add(error.toString()); 
       Toast.makeText(getContext(), error.toString(), Toast.LENGTH_SHORT).show(); 
      } 
     }); 

     requestQueue.add(req); 



     String[] data = new String[len]; 
     for(int i = 0; i<len ; i++){ 
      data[i] = requestNoList.get(i); 

     } 





     /*ListView listView = (ListView) view.findViewById(R.id.listView); 

     String[] stringArray = requestNoList.toArray(new String[10]); 

     final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, stringArray); 

     listView.setAdapter(adapter);*/ 

     //Toast.makeText(getActivity(), stringArray[0], Toast.LENGTH_SHORT).show(); 

     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 


//    int color = parent.getAdapter().getItem(position); 
//    position = position - 1 ; 
       Toast.makeText(getActivity(), "position: "+position+"id: "+id, Toast.LENGTH_SHORT).show(); 

       String data = parent.getAdapter().getItem(position).toString(); 

       Toast.makeText(getActivity(),"data "+ data, Toast.LENGTH_SHORT).show(); 

       String reqNo = requestNoList.get(position); 

       Toast.makeText(getActivity(),"reqno "+reqNo , Toast.LENGTH_SHORT).show(); //String.valueOf(position) 


       Intent intent = new Intent(getActivity(), ReqDisp.class); 
       intent.putExtra("Position",reqNo); 
       startActivity(intent); 
      } 
     }); 

     return view; 
    } 



    class CustomAdapter extends BaseAdapter{ 
     @Override 
     public int getCount() { 
      return 0; 
     } 

     @Override 
     public Object getItem(int position) { 
      return null; 
     } 

     @Override 
     public long getItemId(int position) { 
      return 0; 
     } 

     @SuppressLint("ViewHolder") 
     @Override 
     public View getView(int i, View view, ViewGroup parent) { 

      view = getActivity().getLayoutInflater().inflate(R.layout.custom_layout_listview, null); 

      TextView textView_request = (TextView)view.findViewById(R.id.tvReq); 
      TextView textView_description = (TextView)view.findViewById(R.id.tvDesc); 
      TextView textView_dates = (TextView)view.findViewById(R.id.tvDate); 
      ImageView imageView = (ImageView)view.findViewById(R.id.imageView4); 


      if(String.valueOf(requestNoList.toArray()[i]) == null){ 
       textView_request.setText("Empty "+String.valueOf(i)); 
      } 
      //textView_request.setText(String.valueOf(requestNoList.toArray()[i])); 
      textView_description.setText(String.valueOf(requestDescriptionList.toArray()[i])); 
      textView_dates.setText(String.valueOf(dateList.toArray()[i])); 

      if(String.valueOf(statusList.toArray()[i]).equals("0")){ 
       imageView.setImageResource(R.drawable.ic_new_releases_black_24dp); 
      } 
      else{ 
       imageView.setImageResource(R.drawable.ic_home_black_24dp); 
      } 




      return null; 
     } 
    } 


} 

助けてください。

Answer 1

は厳密解を指摘することができませんでしたが、ここではいくつかのポインタ/入力されています

1. あなたonResponse方法で応答を取得していますか？
2. 私はあなたがあなたのリストビューに設定しているあなたのcustomAdapterにデータを設定していないと思います（私たちは通常、それにデータを追加 - > customAdapter.addAll（listOfData）;。
3. 代わりにListViewコントロールのRecyclerViewを使用してみてください - >ベター私は `textView_description.setText（String.valueOf（requestDescriptionList.toArrayを使用してcustomAdapterを移入しようとしたパフォーマンス。