单独的通知不会出现在订阅主题的同一设备上

Separate Notifications do not appear on a same device subscribed to a topic

当我通过 api 使用 FCM 订阅主题循环推送多个通知时,之前的通知在我的 android 设备上被新通知取代。有没有办法分别推送多个通知。我正在使用 PHP Curl 请求。

foreach ($result as $item)
{
                    $message = array
                    (
                        'body' => "Details:".$item['tagid'],
                        'title' => "Tag:".$item['event'],
                        'key1' => "NotificationActivity"
                    );

                    $fields = array(
                        'to' => '/topics/all',
                        'data' => array
                        (
                            'message' => $message
                        ),
                    );
                    $headers = array
                    (
                        'Authorization: key=' . API_ACCESS_KEY,
                        'Content-Type: application/json'
                    );

                    $ch = curl_init();
                    curl_setopt($ch, CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send');
                    curl_setopt($ch, CURLOPT_POST, true);
                    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
                    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
                    $result = curl_exec($ch);
                    curl_close($ch);
                }

我的 Firebase 服务出现问题。不根据 id 识别通知。 问题是,我在 id 字段中传递了 0。 notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());

设置每个通知的唯一 ID 后,它起作用了:

notificationManager.notify(id /* ID of notification */, notificationBuilder.build());