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由于当应用程序同时处于后台和前台时，我必须让推送通知按要求工作，所以我在测试时（2 天内）执行了30-40 条通知，所有通知在到达 android 设备时都正常（我的自定义通知通道也是按预期出现在设备设置中）。

突然，通知继续到达但没有声音（并且自定义通知通道不会像以前那样出现在设置中）。既然这样，我就不可能在通知中恢复声音（无论是背景还是前景）。

没有更改任何涉及的代码。我认为声音已经停止，因为由于某种原因没有创建通知通道。有没有人经历过或者可以帮助我？

案例“后台应用”的关键代码：

1. 表现。

     <meta-data
          android:name="com.google.firebase.messaging.default_notification_channel_id"
          android:value="my_fcm_default_channel" />

2. 启动活动 - onCreate()：

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            // Create channel to show notifications.
            val channelName = "Custom notification channel"
            val defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
            val notificationManager = getSystemService(NotificationManager::class.java)
            val channel = NotificationChannel("my_fcm_default_channel",
                channelName,
                NotificationManager.IMPORTANCE_HIGH)
            channel.setSound(defaultSoundUri, AudioAttributes.Builder().build()) // Not working
            channel.enableLights(true)
            channel.lightColor = Color.WHITE
            channel.enableVibration(true)
            channel.vibrationPattern = longArrayOf(100, 200, 100, 200, 100, 200, 100)
            notificationManager.createNotificationChannel(channel)
    }

3.云函数node.js片段代码：

   // Notification details.
         const payload = {
           notification: {
             title: 'Some title',  
             body: 'Some message',
             sound: 'default',
             click_action: "OPEN_ACTIVITY_3"
           },
           data: {
             name: 'notification_3'
           }
         };

更新：

案例“前台应用程序”的关键代码：

1. MyFirebaseMessagingService - onMessageReceived()：

        val name = remoteMessage.data["name"] ?: ""
        var intent: Intent? = null
        when (name) {
            "notification_1" -> {
                intent = Intent(this, Activity1::class.java)
            }
            "notification_2" -> {
                intent = Intent(this, Activity2::class.java)
            }
            "notification_3" -> {
                val clickAction = remoteMessage.notification?.clickAction
                clickAction?.let {
                    intent = Intent(clickAction)
                    intent?.putExtra("name", name)
                }
            }
            "notification_4" -> {
                intent = Intent(this, Activity4::class.java)
            }
        }
        intent?.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        val pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT)

        val defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
        val notificationBuilder = NotificationCompat.Builder(this, "my_fcm_default_channel")
            .setSmallIcon(R.drawable.common_google_signin_btn_icon_dark) // Dummy icon
            .setContentTitle(remoteMessage.notification?.title ?: "")
            .setContentText(remoteMessage.notification?.body ?: "")
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setVibrate(longArrayOf(100, 200, 100, 200, 100, 200, 100))
            .setContentIntent(pendingIntent)
            .setDefaults(Notification.DEFAULT_ALL) // this line sets the default vibration and sound for notification

        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        // Since android Oreo notification channel is needed.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = NotificationChannel("my_fcm_default_channel",
                "Custom notification channel",
                NotificationManager.IMPORTANCE_HIGH)
            channel.setSound(defaultSoundUri, AudioAttributes.Builder().build()) // Not working
            channel.enableLights(true)
            channel.lightColor = Color.WHITE
            channel.enableVibration(true)
            channel.vibrationPattern = longArrayOf(100, 200, 100, 200, 100, 200, 100)
            notificationManager.createNotificationChannel(channel)
        }

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