Hey there! Let's fix this JSON parsing error step by step.

The Root Cause (It's in Your PHP Script!) #

Your problem comes down to invalid output from the PHP side. Look at the browser output you shared: it starts with Array (...) instead of pure JSON. That's because after you echo $json; (which outputs the correct JSON), you added print_r($data); — this dumps the raw array text right after the JSON, making the entire response a messy mix of valid JSON and plain text. No JSON parser can handle that, which explains both the Android JSONException and browser SyntaxError.

Fix the PHP Script #

Simply remove the print_r($data); line. This line is only for debugging and ruins the pure JSON format your app needs. Here's the cleaned-up code:

<?php 
require_once 'connect.php'; 
$sql="SELECT * FROM events ORDER BY Eid DESC"; 
$result=$conn->query($sql); 
$data = array(); 
if($result->num_rows >0){ 
    while($row = $result->fetch_assoc()){ 
        $data[] = array( 
            'Title' => $row["Title"], 
            'Date' => $row["Date"], 
            'Time' => $row["Time"], 
            'Location' => $row["Location"], 
            'image_url' => $row["image_url"]
        ); 
    } 
} 
header('Content-Type:application/json'); 
$json = json_encode($data, JSON_UNESCAPED_UNICODE); 
echo $json; 
// Remove this line: print_r($data); 
exit; 
?>

Quick Fix for Your Android Kotlin Code #

While we're at it, there's a small bug in your parsing logic: you're trying to get Date and Time as integers with obj.getInt(), but those values are strings (like 2018-01-31 and 04:30:00). This will throw another JSONException once the PHP issue is fixed. Update those lines to use getString() instead:

// Replace these lines:
// events.setDate(obj.getInt("Date"))
// events.setTime(obj.getInt("Time"))

// With:
events.setDate(obj.getString("Date"))
events.setTime(obj.getString("Time"))

Verify the Fix #

After updating the PHP script, visit the URL in your browser — you should see only a clean JSON array like this:

[{"Title":"Pediatrics 1st Bekaa","Date":"2018-01-31","Time":"04:30:00","Location":"Bekaa","image_url":"http://www.khazaal.tech/DoctorMobileApp/images/2.PNG"},...]

Once that's working, your Android app's JsonArrayRequest will parse the response correctly, and the list will populate as expected.

内容的提问来源于stack exchange，提问作者Sandra Khazaal