How to parse multiple rows with jsonOject

Question

I am fetching data from mysql using php API and i pass results to android with Json_encode but when i populate results to android

Answer 1

This solution will help anyone who needds to fetch data from mysql using where clause based to android input with volley library .

DBHandler which handles php functions :

                     .....
               public function getDriverHistory($plate_no) {
             $stmt = $this->conn->prepare("SELECT * from drivers_history 
           where  drivers_history.plate_no = ?");

          $stmt->bind_param("s", $plate_no);
           if ($stmt->execute()) {

           //  $user = $stmt->get_result()->fetch_assoc();       
           //  $stmt->close();
           // return $user;

         $result = $stmt->get_result();
          $usersArr = array();
         while ($user = $result->fetch_assoc()){
        $usersArr[] = $user;
         }
          $stmt->close();
         return $usersArr;


         } else {
        return NULL;
         }
         }
             ....

GetdriverFunction.php used to access function above :

                                      ...........

            FALSE); 
            if (isset($_POST['plate_no'])) {
              // receiving the post params
                 $plate_no = $_POST['plate_no']; 
                  $usersArr = $db->getDriverHistory($plate_no);
              if ($usersArr != false) {
            $response["error"]= FALSE;
          $response["user"] = $usersArr;
         echo json_encode($response); 
              }
             }
         ......

finally Java part method to fetch all results where plate_no equals to something plate_no :

              private void GetParkingInfo(final String plate_no) {
           // Tag used to cancel the request
             String tag_string_req = "req_Verfication";

   progressBarList.setVisibility(View.VISIBLE);
       //        myList.setVisibility(View.GONE);

    StringRequest strReq = new StringRequest(Request.Method.POST,
        Urls.URL_driver_parking_information, new 
     Response.Listener() {

    @Override
    public void onResponse(String response) {
        Log.d(TAG, "cerfication Response: " + response.toString());             
        // Parsing json
        JSONArray jsonArrayResult ;
        for (int i = 0; i < response.length(); i++) {

             try {

                 JSONObject jObj = new JSONObject(response);
                boolean error = jObj.getBoolean("error");
                // Check for error node in json
                if (!error) {


                    // user successfully exist in database

                      jsonArrayResult = jObj.getJSONArray("user");

                for(int x=0; x prodHashMap = new 
                HashMap();

                    prodHashMap.put("paid_amount", paid_amount);
                    prodHashMap.put("parking_duration", parking_duration);
                    prodHashMap.put("parking_name", parking_name);

                    ArrayList> wordList;
                       wordList = new ArrayList>();
                    wordList.add(prodHashMap);
                    userList = wordList ;
                    }
                    ShowListData();

                    progressBarList.setVisibility(View.GONE);

                     }

                  else{

                    // Error in login. Get the error message
          //                       // hiding the progress bar
                    progressBarList.setVisibility(View.GONE);
                     myList.setVisibility(View.VISIBLE);
                    String errorMsg = jObj.getString("error_msg");
                    Toast.makeText(getApplicationContext(), errorMsg, 
           Toast.LENGTH_LONG).show();

                }

               } catch (JSONException e) {
                // JSON error
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "Json error: " + 
         e.getMessage(), Toast.LENGTH_LONG).show();
    //                     // hiding the progress bar
                progressBarList.setVisibility(View.GONE);
                myList.setVisibility(View.VISIBLE);
               }
            }
        }
          }, new Response.ErrorListener() {

       @Override
       public void onErrorResponse(VolleyError error) {
        Log.e(TAG, "Verfication error Error: " + error.getMessage());

        Toast.makeText(getApplicationContext(),
                "response error", Toast.LENGTH_LONG).show();
      //                Toast.makeText(getApplicationContext(),
    //                        error.getMessage(), Toast.LENGTH_LONG).show();
        // hiding the progress bar
        progressBarList.setVisibility(View.GONE);
        myList.setVisibility(View.VISIBLE);
        }
         }) {
        @Override
         protected Map getParams() {

        // Posting parameters to verfication url
        Map params = new HashMap();
        params.put("plate_no", plate_no);
        return params;
       }
    };
//        // Adding request to request queue

    AppController.getInstance().addToRequestQueue(strReq,tag_string_req);
   }