How can send arraylist data from volley request and get in php

Question

I want to send a ID and array list of string data to php from volley requset . but i'm not sure how can send correctly to server and how can get it in php . Here is android side to send request to server:

private void sendMessage() { StringRequest stringRequest = new StringRequest(Request.Method.POST, Config.NOTIF_URL, new Response.Listener < String > () { @Override public void onResponse(String response) { Log.d("Response --->", response); jsonNotif = new ParseJSON(response); jsonNotif.parseJSON(); } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Toast.makeText(context, error.getMessage(), Toast.LENGTH_LONG).show(); } }) { @Override protected Map < String, String > getParams() throws AuthFailureError { Map < String, String > params = new HashMap < > (); //Adding parameters to request ArrayList < String > courseList = new ArrayList < String > (checkedSet); String ID = prefProfID.getString(Config.PROFID_SHARED_PREF, "0"); Log.d("ID prof list >>", ID); params.put(Config.PROFID_SHARED_PREF, ID); for (int i = 0; i < courseList.size(); i++) { params.put("courselist", courseList.get(i)); } //returning parameter return params; } }; RequestQueue requestQueue = Volley.newRequestQueue(context); requestQueue.add(stringRequest); }

And here is my php code :

<?php if ($_SERVER['REQUEST_METHOD'] == 'POST') { //Getting values $courseList = $_POST['courseList']; $professor_ID = $_POST['Prof_ID']; require_once('dbConnect.php'); $newcourseList = implode(", ", $courseList); $sql = "select Stud_ID,student.f_Name,student.l_Name from student,course where course.S_ID = student.Stud_ID and course.P_ID in ($newcourseList)"; $res = mysqli_query($con, $sql); $result = array(); while ($row = mysqli_fetch_array($res)) { array_push($result, array( 'id' => $row[0], 'fname' => $row[1], 'lname' => $row[2], 'tag' => 'studlist' )); } echo json_encode(array( "result" => $result )); mysqli_close($con); } ?>

Convert it to Json Format and send as string

Sush
– Sush

2016-06-10 08:42:47 +00:00
Commented Jun 10, 2016 at 8:42 — Sush
– Sush, Commented Jun 10, 2016 at 8:42

Rick · Accepted Answer · 2019-08-26 08:18:33Z

Finally, I have the easiest and perfect solution:

use this dependency:

implementation 'com.google.code.gson:gson:2.8.2'

and use this line

String data = new Gson().toJson(myArrayList);

Now you can pass this string into volley as string parameters like bellow example.

Example:

protected Map<String, String> getParams() { Map<String, String> params = new HashMap<>(); String data = new Gson().toJson(myArrayList); params.put("terms", data); return params; }

i follow your answer and use this method to sent array to server but it wont work i dont know why?

Yash Jain · Accepted Answer · 2016-06-10 08:42:41Z

If you want to send ArrayList data, I think its better to send it by Converting it into JSONArray

Pravin Suthar · Accepted Answer · 2017-02-02 11:10:52Z

First in your Object in ArrayList: create JSONObjectmethod name as getJSONObject, like this

public class EstimateObject { String id, name, qty, price, total; public EstimateObject(String id, String name, String qty, String price, String total, int position) { this.id = id; this.name = name; this.qty = qty; this.price = price; this.total =total; this.position = position; } public JSONObject getJSONObject() { JSONObject obj = new JSONObject(); try { obj.put("Id", id); obj.put("Name", name); obj.put("Qty",qty); obj.put("Price", price); obj.put("Total", total); } catch (JSONException e) { e.printStackTrace(); } return obj; }

Aftrer Here is how I converted it,in my activity

 JSONObject JSONestimate = new JSONObject(); JSONArray myarray = new JSONArray(); for (int i = 0; i < items.size(); i++) { try { JSONestimate.put("data:" + String.valueOf(i + 1), items.get(i).getJSONObject()); myarray.put(items.get(i).getJSONObject()); } catch (JSONException e) { e.printStackTrace(); } } Log.d("JSONobject: ", JSONestimate.toString()); Log.d("JSONArray : ", myarray.toString());

Here i converted both type JSONObject and JSONArray.

After in

map.put("jsonarray",myarray.toString());

And in php side:

$json = $_POST['jsonarray']; $jsonarray = json_decode($json,true);

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