从android volley

Question

您好我已经使用android volley编写了一个请求，将String值的ArrayList发送到PhP服务器。服务器需要解码JsonObject（即和ArrayList）并使用MySQL命令查询数据库并返回与ArrayList中任何值相关的结果。

这是我的android请求代码（将ArrayList eventIDBeacon发送到PhP服务器）

private void getEventDetailRespond(RequestQueue requestQueue) {
        JSONObject params = new JSONObject();
        try {
            params.put(Config.EVENT_ID, eventIDBeacon);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        //Creating a JSONObject request
        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST,Config.DATA_URL,params,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject respond) {
                            try {
                                eventArray = new JSONArray();
                                eventDetail = new ArrayList<>();
                                eventArray = respond.getJSONArray("result");
                                eventDetail = getEventDetail(eventArray);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                            Toast.makeText(Beacon_MainActivity.this, "Unable to fetch data: " +error.getMessage(),Toast.LENGTH_LONG).show();
                        }
                    }
                );

        //Adding request to the queue
        requestQueue.add(jsonObjectRequest);

    }

    private ArrayList getEventDetail(JSONArray j) {
        ArrayList event = new ArrayList();
        //Traversing through all the items in the json array
        for (int i = 0; i < j.length(); i++) {
            try {
                //Getting json object
                JSONObject json = j.getJSONObject(i);

                //Adding the name of the event to array list
                event.add(json.getString(Config.EVENT_TITLE));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        spinner.setAdapter(new ArrayAdapter<String>(Beacon_MainActivity.this, android.R.layout.simple_spinner_dropdown_item, event));
        return event;
    }

这是我的PhP服务器代码，用于接收数组并使用MySQL命令返回响应

<?php

if($_SERVER['REQUEST_METHOD']=='POST'){

// decoding the json array
$post = json_decode(file_get_contents("php://input"), true);

$eventID = $post['EventID'];    

require_once('dbconnect.php');

$sql = "SELECT EventID, EventTitle, EventDesc, EventTime FROM Event WHERE EVENTID IN $eventID";

$res = mysqli_query($con,$sql);

$result = array();


 while ($row = mysqli_fetch_array($res)){
        array_push($result,array(
            'EventID'=>$row['EventID'],
            'EventTitle'=>$row['EventTitle'],
            'EventDesc'=>$row['EventDesc'],
            'EventTime'=>$row['EventTime']
        ));
    }

    header('Content-Type: application/json');
    echo json_encode(array('result'=>$result), 256);

    mysqli_close($con);


}

我不知道为什么我没有得到任何结果。任何帮助都非常感谢（我已尝试手动将PhP代码中的$ eventID更改为实际值，并且可以将结果发回）