JSONObject MyObject = new JSONObject(AllJson);
   JSONObject agac = MyObject.getJSONObject("agac-"+String.valueOf(b)); // b is a index in your list
   String agac_name  = agac.getString("agac-name");
   int agac_sayisi  = agac.getInt("agac-sayisi");
   double agac_carpani = agac.getDouble("agac-carpani");
   double agac_fiyat = agac.getDouble("agac-fiyati");
   int agac_level  = agac.getInt("agac-level");