Firebase雲消息傳遞服務 - 即使應用程序被終止也會收到通知

Question

如果Android應用被用戶或Android故意殺死， FirebaseMessagingService會在收到消息時檢測到通知嗎？

我已殺死我的應用，然后從Firebase控制台發送了一條消息。 我無法收到通知。 有沒有辦法，即使應用程序被殺，我也可以收到通知。

public class YumigoBidMessagingService extends FirebaseMessagingService {

private static final String TAG = YumigoBidMessagingService.class.getSimpleName();

    /**
     * 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. 
        // [END_EXCLUDE]

        // TODO(developer): Handle FCM messages here.
        // Not getting messages here? See why this may be: 
        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());
        }

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }
        sendNotification(remoteMessage.getData()+"");
        // 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.
    }
    /**
     * Create and show a simple notification containing the received FCM message.
     *
     * @param messageBody FCM message body received.
     */
    private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, BiddingActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.ic_stat_ic_notification)
                .setContentTitle("Bid Received")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setPriority(Notification.PRIORITY_HIGH)
                .setContentIntent(pendingIntent);

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
    }
}

Answer 1

如果應用程序被殺死/強制停止，如上面鏈接的答案中所述：

強制停止是對應用程序的完全終止 - 所有進程都被終止 ，所有服務都停止 ，所有通知都被刪除，所有警報都被刪除等。

這會導致應用程序根本沒有收到任何類型的通知，因為它是從3.1版開始為Android設計的，如此答案中所述 ：

處於停止狀態的應用程序不接收廣播Intents。

停止狀態是：

最初安裝應用程序時（在用戶在應用程序中運行某些內容之前）或強制停止之后。 你可以在這里找到更多相關信息： http ： //developer.android.com/about/versions/android-3.1.html#launchcontrols

僅有檢索從我的答案的一部分在這里 。 查看主題，它也可能對您有所幫助。

Answer 2

您可以使用FCM發送兩種類型的消息，即通知或數據消息 。

您發送的是通知消息 ，如果應用程序處於后台，則會將其傳送到系統托盤而不是onMessageRecieved（）回調。

嘗試使用數據消息，在這種情況下，您將始終在onMessageRecieved（）回調中收到通知，您可以根據需要處理，而不是依賴於系統托盤。

Answer 3

簡而言之，要喚醒被殺的應用程序，您應始終使用data對象發送通知，以在您的應用程序中調用通知服務類處理程序FirebaseMessagingService.onMessageReceived（） 。

也可以嘗試不是從Firebase控制台發送它，而是從其他地方發送它（例如在線測試后期服務）。