当应用未运行时，FCM显示默认消息而非自定义消息 [英] FCM shows default message than custom message when app is not running

问题描述

问题:我的FCM代码针对不同情况显示了不同的消息:

Problem: My FCM code shows different messages to different cases:

案例1:当应用运行时，它会显示自定义通知正文

Case 1: When app is running it shows the custom notification body

案例2:当应用在后台运行时，它会显示自定义通知正文

Case 2: When the app is running in the background it shows custom notification body

情况3:当应用未运行时，它显示从FCM接收到的默认消息比自定义消息

Case 3: When the app is not running it shows the default message received from FCM than the custom message

代码:

/* The class extends FirebaseMessagingService() */

override fun onMessageReceived(remoteMessage: RemoteMessage) {
        try {
/* Some other codes */            

            val pendingIntent = PendingIntent.getActivity(this, 0, Intent(), PendingIntent.FLAG_ONE_SHOT)
            val builder = NotificationCompat.Builder(this, "" + R.string.notification_channel_id)
                    .setSmallIcon(R.mipmap.ic_launcher_round)
                    .setContentTitle(remoteMessage.notification!!.title)
                    .setContentText(getString(R.string.custom_message_body))
                    .setAutoCancel(true)
                    .setContentIntent(pendingIntent)
            val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                val channel = NotificationChannel("" + R.string.notification_channel_id, "Alert channel", NotificationManager.IMPORTANCE_DEFAULT)
                manager.createNotificationChannel(channel)
            }
            manager.notify(0, builder.build())

/* super.onMessageReceived(remoteMessage) was REMOVED to prevent default functions */
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }

推荐答案

这是预期的. FCM对于应用程序状态(前台和后台/已终止)具有不同的行为. 您应该根据用例，通过从服务器发送的有效负载来处理此问题.

This is expected. FCM has different behaviours for app status (foreground and background / killed). You should handle this by the payload you sent from server, according to your use case.

从服务器发送的味精必须以通知"或数据"格式从仪表板或服务器端api发送. 注意:在Firebase dashobard中，您只能发送通知"正文，而不能发送数据.在这种情况下，FCM将直接显示通知，而不会回调您的应用.

The msg sent from server has to be sent in either "notification" or "data" format, from dashboard or server side api. Note: From firebase dashobard you can only send "notification" body and not data. In such cases, FCM will directly display the notif without giving a callback to your app.

服务器端 以下是示例格式:

通知类型格式 注意:默认情况下，Android系统将在通知托盘中显示通知，而您无需显示它.

Notification Type Format Note : Android System will by default display the notification in the notification tray and you don't need to display it.

 { 
    "to": "your_token_id",
     "notification" : {
             "title" : "FCM Notification title!",
             "body" : "FCM Notification subtext!",
             "content_available" : true,
             "priority" : "high"
     }
}

数据格式(用于在应用程序中接收前台和后台的回调) 注意:您必须自行处理回调并显示notif.

Data Format (For receiving callback in app, in foreground and background) Note : You have to handle callback and display notif on your own.

{ 
    "to": "your_token_id",

    "data" : {
         "title" : "FCM Notification Title ",
         "subtext" : "FCM Notification Sub Title",
         "type" : "999",
         "priority" : "high"
    }
}

Android客户端 要处理您的Android接收器中收到的有效负载，请在此处

Android Client To handle the payload received in your Android receiver, checl the official guide here

/* The class extends FirebaseMessagingService() */   
 override fun onMessageReceived(remoteMessage: RemoteMessage) {

        Log.d(TAG, "From: ${remoteMessage.from}")

        // Check if message contains a data payload.
        remoteMessage.data.isNotEmpty().let {
            Log.d(TAG, "Message data payload: " + remoteMessage.data)

        if (/* Check if data needs to be processed by long running job */ true) {
            // For long-running tasks (10 seconds or more) use WorkManager.
            scheduleJob()
        } else {
            // Handle message within 10 seconds
            handleNow()
        }
    }

    // Check if message contains a notification payload.
    remoteMessage.notification?.let {
        Log.d(TAG, "Message Notification Body: ${it.body}")
    }

    // 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.
}

在此处

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