JSON對象到JSON數組到Arraylist到Arraydapter

Question

我想問如何顯示我的數組列表，我從我的webhost數據庫獲取數據並將它傳遞給JSON對象，然後我使用JSON數組將對象作爲後一個數組我把它傳遞一個ArrayList來顯示所有的數據的，我得到的，如果我打印的ArrayList的輸出這裏是我得到..

I/System.out: {"checkdate":"Oct 31, 2016","checkno":"123","datepaid":"Oct 31, 2016","clientname":"naruto","bank":"bdo","amount":"100","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Oct 31, 2016","checkno":"123","datepaid":"Oct 31, 2016","clientname":"naruto","bank":"bdo","amount":"100","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Oct 31, 2016","checkno":"123","datepaid":"Oct 31, 2016","clientname":"naruto","bank":"bdo","amount":"100","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Oct 31, 2016","checkno":"123","datepaid":"Oct 31, 2016","clientname":"naruto","bank":"bdo","amount":"100","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Oct 31, 2016","checkno":"123","datepaid":"Oct 31, 2016","clientname":"naruto","bank":"bdo","amount":"100","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Oct 31, 2016","checkno":"123","datepaid":"Oct 31, 2016","clientname":"naruto","bank":"bdo","amount":"100","status":"UNFINISHED"} 
I/System.out: {"checkdate":"qwe","checkno":"123","datepaid":"qwe","clientname":"qwe","bank":"qwe","amount":"123","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 5, 2016","checkno":"1400056800","datepaid":"Nov 6, 2016","clientname":"Gelli Espiritu","bank":"BDO","amount":"123","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 5, 2016","checkno":"1400458800","datepaid":"Nov 5, 2016","clientname":"qwerty","bank":"east west","amount":"123","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 5, 2016","checkno":"1400458800","datepaid":"Nov 5, 2016","clientname":"qwerty","bank":"east west","amount":"123","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 6, 2016","checkno":"123456789","datepaid":"Nov 8, 2016","clientname":"Naruto","bank":"MAYBANK","amount":"123456789","status":"UNFINISHED"} 
I/System.out: {"checkdate":"January 17, 2016","checkno":"13554400","datepaid":"January 20, 2016","clientname":"Mark Sample","bank":"BPI","amount":"100000","status":"UNFINISHED"} 
I/System.out: {"checkdate":"January 17, 2016","checkno":"13554400","datepaid":"January 20, 2016","clientname":"Mark Sample","bank":"BPI","amount":"100000","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 6, 2016","checkno":"14","datepaid":"Nov 6, 2016","clientname":"GELLI gumana ka","bank":"BPI","amount":"1234","status":"UNFINISHED"} 
I/System.out: {"checkdate":"March 7, 2016","checkno":"98671278","datepaid":"March 10, 2016","clientname":"Ben Sample","bank":"LANDBANK","amount":"2147483647","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Dec 9, 2016","checkno":"98678968","datepaid":"Dec 30, 2016","clientname":"John Sample","bank":"CHINABANK","amount":"92745","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 8, 2016","checkno":"87976","datepaid":"Nov 4, 2016","clientname":"GWEN SAMPLE","bank":"UNION BANK","amount":"6789","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 3, 2016","checkno":"897657","datepaid":"Nov 26, 2016","clientname":"Donald Sample","bank":"BANK","amount":"98797","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Nov 30, 2016","checkno":"12564","datepaid":"Dec 3, 2016","clientname":"Ronald Sample","bank":"GM bank","amount":"10120","status":"UNFINISHED"} 
I/System.out: {"checkdate":"Dec 1, 2016","checkno":"123456","datepaid":"Dec 4, 2016","clientname":"Jolly Sample","bank":"china bank","amount":"12345","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 2, 2016","checkno":"132456","datepaid":"Dec 5, 2016","clientname":"Bet Sample","bank":"land bank","amount":"1451","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 4, 2016","checkno":"145623","datepaid":"Dec 6, 2016","clientname":"Aileen Sample","bank":"land bank","amount":"123445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 7, 2016","checkno":"145656","datepaid":"Dec 9, 2016","clientname":"Joyce Sample","bank":"land bank","amount":"323445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 7, 2016","checkno":"145656","datepaid":"Dec 9, 2016","clientname":"Joyce Sample","bank":"land bank","amount":"323445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 8, 2016","checkno":"165623","datepaid":"Dec 10, 2016","clientname":"Joy Sample","bank":"land bank","amount":"4523445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 9, 2016","checkno":"6445623","datepaid":"Dec 11, 2016","clientname":"jay Sample","bank":"china bank","amount":"4523445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 10, 2016","checkno":"64456245","datepaid":"Dec 113, 2016","clientname":"Rigor Sample","bank":"BDO","amount":"44523445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 10, 2016","checkno":"64456245","datepaid":"Dec 113, 2016","clientname":"Rigor Sample","bank":"BDO","amount":"44523445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 11, 2016","checkno":"456789","datepaid":"Dec 14, 2016","clientname":"Ynna Sample","bank":"BDO","amount":"45123445","status":"UNFINISHED"} 
I/System.out: {"checkdate":"..Dec 12, 2016","checkno":"9814156","datepaid":"Dec 15, 2016","clientname":"Francheka Sample","bank":"China bank","amount":"41523445","status":"UNFINISHED"} 

我使用的片段和這裏的片段

RecordFragment.java

import android.content.Context; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.support.v7.app.AlertDialog; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.Toast; 

import com.android.volley.Response; 
import com.android.volley.VolleyError; 
import com.android.volley.toolbox.StringRequest; 

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

import java.util.ArrayList; 

public class RecordFragment extends Fragment implements Response.Listener<String> { 
    private ArrayAdapter<String> arrayAdapter; 
    private ArrayList<String> listdata = new ArrayList<>(); 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.activity_record, container, false); 
     ListView lvCheck = (ListView) v.findViewById(R.id.lvCheck); 
     arrayAdapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, listdata); 
     lvCheck.setAdapter(arrayAdapter); 
     return v; 
    } 

public void onAttach(Context context) { 
      super.onAttach(context); 
      String url = "http://samplechecker.site88.net/Request.php"; 
      StringRequest stringRequest = new StringRequest(url, this, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Toast.makeText(getContext(), "Error while reading data", Toast.LENGTH_SHORT).show(); 
      } 
     }); 

     MySingleton.getInstance(getContext()).addToRequestQueue(stringRequest); 

    } 


    @Override 
    public void onResponse(String response) { 


     try { 


      JSONObject jsonResponse = new JSONObject(response); 
      JSONArray arr = jsonResponse.getJSONArray("message"); 
      boolean success = jsonResponse.getBoolean("success"); 


      for (int i = 0; i < arr.length(); i++) { 
       JSONObject json_object = arr.getJSONObject(i); 
       String checkno = json_object.getString("checkno"); 
       String clientname = json_object.getString("clientname"); 
       String bank = json_object.getString("bank"); 
       String datepaid = json_object.getString("datepaid"); 
      } 


      if(success){ 
       System.out.println(response); 


       if (arr != null) { 
        for (int i=0;i<arr.length();i++){ 
         listdata.add(arr.get(i).toString()); 

         System.out.println(listdata.get(i)); 
        } 




       } 



      } 
      System.out.println("SUCCESS"); 




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

    } 


} 

，這裏是我的XML

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 


    <ListView 
     android:id="@+id/lvCheck" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 
</LinearLayout> 

Answer 1

在你onCreateView（），將其提供給適配器之前初始化你的ListData變量：

listdata = new ArrayList<String>(); 

一旦你添加的響應數據到你的ArrayList，通知適配器有關此更改：

if(success) { 
    System.out.println(response); 
    if (arr != null) { 
     for (int i=0;i<arr.length();i++){ 
      listdata.add(arr.get(i).toString()); 
      System.out.println(listdata.get(i)); 
     } 
    } 
    arrayAdapter.notifyDataSetChanged(); 
}