当应用在前景时，无法接收FCM通知

Question

我正在使用FCM通知。当应用在后台时，我的通知正常运行，但是当应用在前景时无法接收通知。我几乎尝试了一切，但没有工作。当应用在前景时未收到通知。

subtest.xml：

       <service
        android:name=".Notification.MyFirebaseMessagingService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>
    <service android:name=".Notification.MyFirebaseInstanceIDService">
        <intent-filter>
            <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
        </intent-filter>
    </service>

代码(firebasemessagingservice(：

           @Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.e(TAG, "From: " + remoteMessage.getFrom());
    if (remoteMessage == null)
        return;
    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        Log.e(TAG, "Notification Body: " + remoteMessage.getNotification().getBody());
        handleNotification(remoteMessage.getNotification().getBody());
    }
    try {
        JSONObject json = new JSONObject(remoteMessage.getData().toString());
        handleDataMessage(json);
    } catch (Exception e) {
        Log.e(TAG, "Exception: " + e.getMessage());
    }

    Log.e(TAG, "Data Payload: " + remoteMessage.getData().toString());
}
private void handleNotification(String message) {
    if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
        // app is in foreground, broadcast the push message
        Intent pushNotification = new Intent(Config.PUSH_NOTIFICATION);
        pushNotification.putExtra("message", message);
        LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);
        // play notification sound
        NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
        notificationUtils.playNotificationSound();
    } else {
        // If the app is in background, firebase itself handles the notification
    }
}
private void handleDataMessage(JSONObject json) {
    Log.e(TAG, "push json: " + json.toString());
    try {
        JSONObject data = json.getJSONObject("data");
        String title = data.getString("title");
        String message = data.getString("body");
        boolean isBackground = data.getBoolean("is_background");
        String imageUrl = data.getString("image");
        String timestamp = data.getString("timestamp");
        JSONObject payload = data.getJSONObject("payload");
        Log.e(TAG, "title: " + title);
        Log.e(TAG, "message: " + message);
        Log.e(TAG, "isBackground: " + isBackground);
        Log.e(TAG, "payload: " + payload.toString());
        Log.e(TAG, "imageUrl: " + imageUrl);
        Log.e(TAG, "timestamp: " + timestamp);

        if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
            // app is in foreground, broadcast the push message
            Intent pushNotification = new Intent(Config.PUSH_NOTIFICATION);
            pushNotification.putExtra("message", message);
            LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);
            // play notification sound
            NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
            notificationUtils.showNotificationMessage("iGrab", message, timestamp, pushNotification);
            notificationUtils.playNotificationSound();

        } else {
            // app is in background, show the notification in notification tray
            Intent resultIntent = new Intent(getApplicationContext(), Splash.class);
            resultIntent.putExtra("message", message);
            // check for image attachment
            if (TextUtils.isEmpty(imageUrl)) {
                showNotificationMessage(getApplicationContext(), title, message, timestamp, resultIntent);
            } else {
                // image is present, show notification with image
                showNotificationMessageWithBigImage(getApplicationContext(), title, message, timestamp, resultIntent, imageUrl);
            }
        }
    } catch (JSONException e) {
        Log.e(TAG, "Json Exception: " + e.getMessage());
    } catch (Exception e) {
        Log.e(TAG, "Exception: " + e.getMessage());
    }
}

Answer 1

FCM支持两种类型的消息：

• 通知消息
• 数据消息

如果服务器发送通知消息，则它会自动显示系统托盘上的通知。

当您希望FCM处理显示时，请使用通知消息 代表客户应用程序通知。当您使用数据消息 想要处理客户端应用程序上的消息。

FCM可以发送通知消息，包括可选数据 有效载荷。在这种情况下，FCM处理显示通知 有效载荷，客户应用程序处理数据有效载荷。

，关键是您的情况：

通知消息将传递到通知托盘 应用在后台。对于前景中的应用程序，消息是 由回调函数处理。

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