Json對象無法轉換爲jsonarray

在我的代碼中，我需要使用JSON在文本視圖中顯示普通文本。我正在使用排球庫來解析JSON。而我的代碼是Json對象無法轉換爲jsonarray

public class PrincipalSpeechFragment extends Fragment implements OnClickListener { 

public PrincipalSpeechFragment(){} 

private String urlJsonArry = "http://imaginetventures.net/sample/everwin_vidhyashram/webservice/rest/?module=speech&from=1-9-2014&to=30-9-2014"; 

private static String TAG = PrincipalSpeechFragment.class.getSimpleName(); 

// JSON Node names 
private static final String TAG_PRINCIPAL_SPEECH ="Principal Speech"; 
private static final String TAG_SPEECH= "speech"; 
private static final String TAG_DESC = "desc"; 

String tag_json_obj = "json_obj_req"; 

private Button getPrincipalSpeech; 

// Progress dialog 
//private ProgressDialog pDialog; 

private TextView txtResponse; 

// temporary string to show the parsed response 
private String jsonResponse; 

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

    View rootView = inflater.inflate(R.layout.fragment_principal_speech, container, false); 

    return rootView; 
} 

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onActivityCreated(savedInstanceState); 

    getPrincipalSpeech = (Button) getActivity().findViewById(R.id.idForPrinciSpeech); 

    txtResponse = (TextView) getActivity().findViewById(R.id.txtResponse); 

    getPrincipalSpeech.setOnClickListener(this); 
} 

@Override 
public void onClick(View arg0) { 
    // TODO Auto-generated method stub 
    makeJsonArrayRequest(); 
} 

private void makeJsonArrayRequest() { 

    JsonArrayRequest req = new JsonArrayRequest(urlJsonArry, 
      new Response.Listener<JSONArray>() { 
     @Override 
     public void onResponse(JSONArray response) { 
      Log.d(TAG, response.toString()); 

      try { 
       // Parsing json array response 
       // loop through each json object 
       jsonResponse = ""; 
       for (int i = 0; i < response.length(); i++) { 

        JSONObject speechobj = (JSONObject) response 
          .get(i); 

        /*String speech = speechobj.getString("speech"); 
        String email = speech.getString("email"); 
        JSONObject phone = speech 
          .getJSONObject("speech"); 
        String home = phone.getString("home"); 
        String mobile = phone.getString("mobile");*/ 

        /*jsonResponse += "Speech: " + speech + "\n\n"; 
        /*jsonResponse += "Email: " + email + "\n\n";*/ 
        /*jsonResponse += "Home: " + home + "\n\n"; 
        jsonResponse += "Mobile: " + mobile + "\n\n\n";*/ 

       } 

       txtResponse.setText(jsonResponse); 

      } catch (JSONException e) { 
       e.printStackTrace(); 
       Toast.makeText(getActivity().getApplicationContext(), 
         "Error: " + e.getMessage(), 
         Toast.LENGTH_LONG).show(); 
      } 

      //hidepDialog(); 
     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 
      Toast.makeText(getActivity().getApplicationContext(), 
        error.getMessage(), Toast.LENGTH_SHORT).show(); 
      //hidepDialog(); 
     } 
    }); 

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

當我按一下按鈕，得到的結果它只是顯示「org.json.JSON.EXCEPTION和值：-------- JSON對象不能轉換到jsonarray「

我不知道我做了什麼錯誤。我只是在烤麪包片中發現這些錯誤。請告訴我。

來源

2014-10-09 IndependentDev

什麼是Log.d的值（TAG，response.toString（））;？ – kyogs 2014-10-09 12:08:28

JSONObject可以嵌套其他JSONObjects和JSONArrays ...查找導致異常並將其轉換爲調用attr.getJSONArray（「attr」）的句子; – 2014-10-09 12:08:44

private String urlJsonArry = "http://imaginetventures.net/sample/everwin_vidhyashram/webservice/rest/?module=speech&from=1-9-2014&to=30-9-2014";

你讓在代碼中規定的URL的請求，如果我把它粘貼到瀏覽器：

響應：

{ 
    "Principal Speech": [ 
     { 
      "speech": "Lorem (... et cetera)." 
     } 
    ] 
}

這是一個JSONObject，不一個JSONArray。所以，你可以在你的代碼JSONObject的JSONArray，然後提取JSONArray你可能想：jsonObject.getJSONArray("Principal Speech");

編輯：添加代碼

private void makeJSONObjectRequest() { 

    JsonObjectRequest req = new JsonObjectRequest(urlJsonArry, //Dont know where that came from, but JsonArrayRequest as classname will probably still work. Custom/your own class, I guess. As long as the type JSONArray is changed to JSONObject 
      new Response.Listener<JSONObject>() { //JSONObject instead of JSONArray 
     @Override 
     public void onResponse(JSONObject response) {//JSONObject instead of JSONArray 
      JSONArray speechArray = response.getJSONArray("Principal Speech"); //get the array from the JSONObject 
      Log.d(TAG, response.toString()); 
      // The rest is the same 
      try { 
       // Parsing json array response 
       // loop through each json object 
       jsonResponse = ""; 
       for (int i = 0; i < response.length(); i++) { 

        JSONObject speechobj = (JSONObject) response 
          .get(i); 

        /*String speech = speechobj.getString("speech"); 
        String email = speech.getString("email"); 
        JSONObject phone = speech 
          .getJSONObject("speech"); 
        String home = phone.getString("home"); 
        String mobile = phone.getString("mobile");*/ 

        /*jsonResponse += "Speech: " + speech + "\n\n"; 
        /*jsonResponse += "Email: " + email + "\n\n";*/ 
        /*jsonResponse += "Home: " + home + "\n\n"; 
        jsonResponse += "Mobile: " + mobile + "\n\n\n";*/ 

       } 

       txtResponse.setText(jsonResponse); 

      } catch (JSONException e) { 
       e.printStackTrace(); 
       Toast.makeText(getActivity().getApplicationContext(), 
         "Error: " + e.getMessage(), 
         Toast.LENGTH_LONG).show(); 
      } 

      //hidepDialog(); 
     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 
      Toast.makeText(getActivity().getApplicationContext(), 
        error.getMessage(), Toast.LENGTH_SHORT).show(); 
      //hidepDialog(); 
     } 
    }); 

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

EDIT2：重寫：

所以JsonArrayObjectRequest是與JsonObjectRequest有點不同

JSONArrayRequest

public JsonArrayRequest(String url, Listener<JSONArray> listener, ErrorListener errorListener) { 
    super(Method.GET, url, null, listener, errorListener); 
}

JsonObjectRequest只與5個PARAMS您在super調用看到（也Theres一個有4個參數，可以但仍比3從jsonarrayrequest更多）

一個構造函數，因此我們不得不改變了一下

private void makeJSONObjectRequest() { 
    Response.Listener<JSONObject> oklistener = new Response.Listener<JSONObject>() { 
     @Override 
     public void onResponse(JSONObject response) { 
      JSONArray speechArray = response.getJSONArray("Principal Speech"); 
      Log.d(TAG, response.toString()); 
      // The rest is the same 
      try { 
       // Parsing json array response 
       // loop through each json object 
       jsonResponse = ""; 
       for (int i = 0; i < speechArray.length(); i++) { 

        JSONObject speechobj = (JSONObject) speechArray.get(i); 

        /*String speech = speechobj.getString("speech"); 
        String email = speech.getString("email"); 
        JSONObject phone = speech 
          .getJSONObject("speech"); 
        String home = phone.getString("home"); 
        String mobile = phone.getString("mobile");*/ 

        /*jsonResponse += "Speech: " + speech + "\n\n"; 
        /*jsonResponse += "Email: " + email + "\n\n";*/ 
        /*jsonResponse += "Home: " + home + "\n\n"; 
        jsonResponse += "Mobile: " + mobile + "\n\n\n";*/ 

       } 

       txtResponse.setText(jsonResponse); 

      } catch (JSONException e) { 
       e.printStackTrace(); 
       Toast.makeText(getActivity().getApplicationContext(), 
         "Error: " + e.getMessage(), 
         Toast.LENGTH_LONG).show(); 
      } 

      //hidepDialog(); 
     } 
    }; 
    Response.ErrorListener errorlistener = new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 
      Toast.makeText(getActivity().getApplicationContext(), 
        error.getMessage(), Toast.LENGTH_SHORT).show(); 
      //hidepDialog(); 
     } 
    }; 
    //Above instantiated the listeners, to make it a little more understandable. Here the second param => null. That sets the method to GET 
    JsonObjectRequest req = new JsonObjectRequest(urlJsonArry, null, oklistener, errorlistener); 

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

來源

2014-10-09 12:08:54 stealthjong

我需要打印該語音內容，該怎麼做。你可以編輯我的代碼。 – IndependentDev 2014-10-09 12:16:54

@SanjayAD查看編輯 – stealthjong 2014-10-09 12:27:30

顯示錯誤兄弟，錯位的構造函數 – IndependentDev 2014-10-09 12:36:05

在你的迴應中，你得到了JSONObject，所以使用下面的代碼。

JSONObject jsnobject = new JSONObject(response);

後

JSONArray jsonArray = jsnobject.getJSONArray("Principal Speech"); 
    for (int i = 0; i < jsonArray.length(); i++) { 
     JSONObject explrObject = jsonArray.getJSONObject(i); 
}

來源

2014-10-09 12:10:46 kyogs

中的代碼，我需要替換此代碼。 – IndependentDev 2014-10-09 12:25:41

Response.Listener<JSONArray> listener = new Response.Listener<JSONArray>() 
     { 
      @Override 
      public void onResponse(JSONArray response) { 
       // TODO Auto-generated method stub 

      } 
     }; 
     Response.ErrorListener errorListener = new Response.ErrorListener() 
     { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       // TODO Auto-generated method stub 

      } 
     };

並使用

JsonArrayRequest jr =new JsonArrayRequest(Request.Method.GET,url, listener, errorListener) ;

編輯2：

我檢查源，它看起來像下面

public JsonArrayRequest(String url, Listener<JSONArray> listener, ErrorListener errorListener) { 
      super(Method.GET, url, null, listener, errorListener); 

     }

來源

2015-06-27 11:38:47 Andriya

Json對象無法轉換爲jsonarray

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