配列内に値jsonを取得しない

Question

私がJSONObject jsonObj = new JSONObject(jsonStr); の場合jsonは配列ではないため、catchに入力します。 この形式はどのように入手できますか？

 protected Void doInBackground(Void... arg0) { 
      HttpHandler sh = new HttpHandler(); 
      // Making a request to url and getting response 
      String url = "http://10.0.2.2:8080/PFA/crimes"; 
      String jsonStr = sh.makeServiceCall(url); 

      Log.e(TAG, "Response from url: " + jsonStr); 
      if (jsonStr != null) { 
      try { 
       JSONObject jsonObj = new JSONObject(jsonStr); 

       // Getting JSON Array node 
       JSONArray data = jsonObj.getJSONArray("crime"); 

       // looping through All Contacts 
       for (int i = 0; i < data.length(); i++) { 
        JSONObject c = data.getJSONObject(i); 
        String day_week = c.getString("day_week"); 
        String naturecode = c.getString("naturecode"); 


        // tmp hash map for single contact 
        HashMap<String, String> contact = new HashMap<>(); 

        // adding each child node to HashMap key => value 
        contact.put("day_week", day_week); 
        contact.put("naturecode", naturecode); 

        // adding contact to contact list 
        List.add(contact); 
       } 
      } catch (final JSONException e) { 
       Log.e(TAG, "Json parsing error: " + e.getMessage()); 
       runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 
         Toast.makeText(getApplicationContext(), 
           "Json parsing error: " + e.getMessage(), 
           Toast.LENGTH_LONG).show(); 
        } 
       }); 

     } 

    } else { 
     Log.e(TAG, "Couldn't get json from server."); 
     runOnUiThread(new Runnable() { 
      @Override 
      public void run() { 
       Toast.makeText(getApplicationContext(), 
         "Couldn't get json from server. Check LogCat for possible errors!", 
         Toast.LENGTH_LONG).show(); 
      } 
     }); 
    } 

    return null; 
} 

JSON：あなたは犯罪ではないJsonArrayのキーでjsonObjectを取得しているため

JSONObject jsonObj = new JSONObject(jsonStr); 
JSONObject jsonMetaObject = jsonMasterObject.getJSONObject("crime"); 

代わりの

JSONObject jsonObj = new JSONObject(jsonStr); 

      // Getting JSON Array node 
    JSONArray data = jsonObj.getJSONArray("crime"); 

：

{ 
    "crime": { 
    "compnos": "zerezrerzerezzr", 
    "day_week": "rtkeertoeirtj ,ertkierj", 
    "domestic": "false", 
    "fromdate": "ekrjtner", 
    "id": "1", 
    "location": "etritkjrtoijty", 
    "main_crimecode": "oijereriotjeroi", 
    "month": "455", 
    "naturecode": "zetzeeztet", 
    "reportingarea": "58", 
    "reptdistrict": "zorigjrgoijtoi", 
    "shift": "rektenrloj", 
    "shooting": "true", 
    "streetname": "kjrtnerkj", 
    "ucrpart": "irtjeroitejroirj", 
    "weapontype": "kejfnergkrtnh", 
    "x": "11", 
    "xstreetname": "zekjrnetk", 
    "y": "11", 
    "year": "45" 
    } 
} 

Answer 1

JsonObject crime = jsonObj.getJsonObject（ "crime"）;

JsonObject compnos = crime.getJsonObject（ "compnos"）;

。 .. ...

json値にjsonArrayはありません。 jsonArrayを取得してください。

Answer 2

はこれを試してみてください。