Firebase Cloud Messaging Service - 即使应用程序被杀死也能收到通知

Question

如果 Android 应用程序被用户故意杀死或 Android，FirebaseMessagingService 是否会在收到消息时检测到通知？

我终止了我的应用程序，然后从 Firebase 控制台发送了一条消息。我无法收到通知。有什么方法可以让我在应用程序被杀死的情况下收到通知。

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

您可以使用 FCM 发送两种类型的消息，即通知或数据消息。

您发送的是通知消息，如果应用程序在后台，它会传送到系统托盘而不是您的 onMessageRecieved() 回调。

尝试使用数据消息，在这种情况下，您将始终在 onMessageRecieved() 回调中收到通知，您可以根据需要进行处理，而不是依赖于系统托盘.

Answer 2

如果应用 killed/force 已停止，如上文 link 中的 answer 所述：

Force stop is a complete kill of the app -- all processes are killed, all services stopped, all notifications removed, all alarms removed, etc.

这将导致该应用根本不会收到任何类型的通知，因为它是为 Android 自版本 3.1 设计的，如此 answer 中所述：

Apps that are in the stopped state do not receive broadcast Intents.

Stopped state is:

when the app is initially installed (before the user runs something in the app) or after a Force Stop. You can find more about this here: http://developer.android.com/about/versions/android-3.1.html#launchcontrols

刚刚从我的回答中检索了一部分。查看线程，它可能对您也有帮助。

Answer 3

简而言之，要唤醒被杀死的应用程序，您应该始终使用 data 对象发送通知 以调用您的通知服务 class 处理程序 FirebaseMessagingService.onMessageReceived() 在您的应用程序中。

也尝试发送它不是从 Firebase 控制台，而是从其他地方post它（例如在线测试 post 服务）。

Firebase Cloud Messaging Service - 即使应用程序被杀死也能收到通知

Firebase Cloud Messaging Service - Receive Notifications even when app is killed

android

firebase

firebase-cloud-messaging

firebase-notifications