未显示FCM通知

Question

我在手机离线时向设备发送通知（未连接到Internet）。5或6分钟后，我将手机连接到Internet，但我没有收到通知我较早发送。连接到Internet后，如何获得通知。

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    private static final String TAG = "MyFirebaseMsgService";
    Integer notify_no = 0;
    /**
     * Called when message is received.
     *
     * @param remoteMessage Object representing the message received from Firebase Cloud Messaging.
     */
    // [START receive_message]
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        // [START_EXCLUDE]
        // There are two types of messages data messages and notification messages. Data messages are handled
        // here in onMessageReceived whether the app is in the foreground or background. Data messages are the type
        // traditionally used with GCM. Notification messages are only received here in onMessageReceived when the app
        // is in the foreground. When the app is in the background an automatically generated notification is displayed.
        // When the user taps on the notification they are returned to the app. Messages containing both notification
        // and data payloads are treated as notification messages. The Firebase console always sends notification
        // messages. For more see: https://firebase.google.com/docs/cloud-messaging/concept-options
        // [END_EXCLUDE]
        // TODO(developer): Handle FCM messages here.
        Log.d(TAG, "From: " + remoteMessage.getFrom());
        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
           /* Integer badge = Integer.parseInt(remoteMessage.getData().get("badge"));
            Log.d("notificationNUmber",":"+badge);
            setBadge(getApplicationContext(), badge);*/
        }
        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }
         notify_no = Integer.parseInt(remoteMessage.getData().get("msgcnt"));
        if (notify_no < 1) {
            notify_no = notify_no + 1;
        } else {
            notify_no = 0;
        }


        //EventBus.getDefault().post(remoteMessage.getNotification().getBody());
        sendNotification(remoteMessage.getNotification().getBody());

        // Also if you intend on generating your own notifications as a result of a received FCM
        // message, here is where that should be initiated. See sendNotification method below.
    }


public void sendNotification(String messageBody)
 {
     Intent intent = new Intent(this,Main2Activity.class);
        intent.putExtra("messages","messages");
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.putExtra("fcm_notification", "Y");
       // startActivity(intent);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,0, intent,
                PendingIntent.FLAG_ONE_SHOT);
        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setContentTitle("FCM Message")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(Uri.parse("content://settings/system/notification_sound"))
                .setVibrate(new long []{100,2000,500,2000})
                .setContentIntent(pendingIntent);
        NotificationManager notificationManager =(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        if (NOTIFICATION_ID > 1073741824) {
            NOTIFICATION_ID = 0;
        }
        notificationManager.notify(NOTIFICATION_ID++, notificationBuilder.build());

        // ShortcutBadger.with(getApplicationContext()).count(badgeCount);
    }
}

连接到Internet后如何获取通知？

我使用php

发送

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
$result = curl_exec($ch);
if ($result === FALSE) {
die('Curl failed: ' . curl_error($ch));
}
curl_close($ch);

Answer 1

正如您在手册中看到的：

https://firebase.google.com/docs/cloud-messaging/concept-options

FCM通常在发送后立即发出消息。但是，这可能并不总是可能。例如，如果平台为Android，则可以关闭设备，离线或其他不可用。FCM可能有意延迟消息，以防止应用程序消耗过多的资源并对电池寿命产生负面影响。

和此：

您可以使用http和xmpp请求中支持的time_to_live参数来指定消息的最大寿命。该参数的值必须是0到2,419,200秒的持续时间，并且对应于FCM商店和尝试传递消息的最长时间。不包含此字段默认值为最长为四个星期的请求。