無法將json值打印到整數數組列表中？是保存在那裏，但無法退出循環？

Question

任何人都可以幫助我將arraylist帶出循環。如果我把它拿出來，它會隨着數組的越界而變空。這裏是我的代碼：

public void collapse() { 
    corequestQueue= Volley.newRequestQueue(getApplicationContext()); 
    String url="http://192.168.43.208/online/json.php"; 
    JsonObjectRequest jsonObjectRequest3=new JsonObjectRequest(Request.Method.GET, url, 
     new Response.Listener<JSONObject>() { 
      @Override 
      public void onResponse(JSONObject response) { 
       try { 
        JSONArray jsonArray=response.getJSONArray("server_responce"); 
        for (int i=0;i<=jsonArray.length();i++){ 

         JSONObject admin=jsonArray.getJSONObject(i); 

         solution.add(Integer.valueOf(admin.getString("sno"))); 

        //if i do like this the values prints here in the toast.   
        //Toast.makeText(User_Login.this, "hello"+solution.get(0), Toast.LENGTH_SHORT).show(); 
        //printing the toast anywhere out of the block gives error.. as assay out of bound 0 on index size 0.. help me guys 
        } 

       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 
     }, 
     new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("Volly","error"); 
      } 
     } 

     ); 
    corequestQueue.add(jsonObjectRequest3); 
    Toast.makeText(User_Login.this, "hello"+solution.get(0), Toast.LENGTH_SHORT).show(); 
} 

最後一行給我的錯誤，因爲它的未來是空的，我不能把數組列表以外的任何地方。當它在循環內部並且值正在增加時，它是完美的。我已經檢查過，只有一件事是我不能把它拿出來？

Answer 1

凌空respoce會給細節只有internet.so我已經使用處理器..叫我應該execute.here是它的meathod aftercertain時間BZ。

 new Handler().postDelayed(new Runnable() { 
     @Override 
     public void run() { 
      Toast.makeText(User_Login.this, ""+solution.size(), Toast.LENGTH_SHORT).show(); 
      Collections.shuffle(solution); 
      data(); 
     } 
    },i*3000); 

我的代碼添加到JSON數組列表：我可以設置，如果條件檢查ArrayList的大小就知道哪裏有合適的網絡或不..

  try { 
         JSONArray jsonArray=response.getJSONArray("server_responce"); 
         for (int i=0;i<=jsonArray.length();i++){ 

          JSONObject admin=jsonArray.getJSONObject(i); 
          String bno = admin.getString("bno"); 
          String series=admin.getString("sno"); 
          if (bnum.equals(bno)) { 
           int k = Integer.valueOf(series); 
           solution.add(k); 
          } 

         } 

Answer 2

希望您給您的全球Integer類型的ArrayList中。

public void collapse(){ 
solution = new ArrayList<>(); 
corequestQueue= Volley.newRequestQueue(getApplicationContext()); 
String url="http://192.168.43.208/online/json.php"; 
JsonObjectRequest jsonObjectRequest3=new JsonObjectRequest(Request.Method.GET, url, 
    new Response.Listener<JSONObject>() { 
     @Override 
     public void onResponse(JSONObject response) { 
      try { 
       JSONArray jsonArray=response.getJSONArray("server_responce"); 
       for (int i=0;i<=jsonArray.length();i++){ 

        JSONObject admin=jsonArray.getJSONObject(i); 
        String val=admin.optString("sno")); 
        if(!val.equalIgnoreCase("")) 
        solution.add(Integer.parseInt(val); 

        //if i do like this the values prints here in the toast.   

        //printing the toast anywhere out of the block gives error.. as assay out of bound 0 on index size 0.. help me guys 
       } 
    Toast.makeText(User_Login.this, "hello"+solution.get(0), Toast.LENGTH_SHORT).show(); 
       if(solution.size()!=0) 
       { 
       Collections.shuffle(solution) 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
     } 
    }, 
    new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.e("Volly","error"); 
     } 
    } 
); 
corequestQueue.add(jsonObjectRequest3); 

} 

Answer 3

事實上如是Ayyappa發佈的解決方案。我再次發佈它。

public void collapse() { 
    corequestQueue= Volley.newRequestQueue(getApplicationContext()); 
    String url="http://192.168.43.208/online/json.php"; 
    JsonObjectRequest jsonObjectRequest3=new JsonObjectRequest(Request.Method.GET, url, 
     new Response.Listener<JSONObject>() { 
      @Override 
      public void onResponse(JSONObject response) { 
       try { 
        JSONArray jsonArray=response.getJSONArray("server_responce"); 
        for (int i=0;i<=jsonArray.length();i++){ 

         JSONObject admin=jsonArray.getJSONObject(i); 

         solution.add(Integer.valueOf(admin.getString("sno"))); 

        //if i do like this the values prints here in the toast.   
        //Toast.makeText(User_Login.this, "hello"+solution.get(0), Toast.LENGTH_SHORT).show(); 
        //printing the toast anywhere out of the block gives error.. as assay out of bound 0 on index size 0.. help me guys 
        } 

       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
       handleAfterResponse(); 
      } 
     }, 
     new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("Volly","error"); 
      } 
     } 

     ); 
    corequestQueue.add(jsonObjectRequest3); 
} 

private void handleAfterResponse() { 
if(solution != null && !solution.isEmpty()) { 
Toast.makeText(User_Login.this, ""+solution.size(), Toast.LENGTH_SHORT).show(); 

      Collections.shuffle(solution); 
      data(); 
    } 
}