有没有办法在后台使用FirebaseMessagingService从推送通知中获取数据？

Question

有什么方法可以获得它吗？因为我需要在应用程序内的对话框窗口中显示它。推送通知不仅仅是文本和标题，它对用户来说不仅仅是信息，它还会起到一定的作用。

在FireBaseMessagingService中接收通知标题、正文和有效负载：

override fun onMessageReceived(msg: RemoteMessage?) {
        val pNotification = msg?.notification
        val payload = msg?.data
        if (pNotification != null){
            val ntitle = pNotification.title
            val nMsg = pNotification.body
        }
        //working with payload - creating notification and Intent for LocalBroadcastmanager
}

正在从onResume()内部的附加程序捕获有效负载

private fun maybeFindBackgroundPayload(extras: Bundle?){
        if (extras != null){
            extras.keySet().forEach { key->
                val keyValue = extras[key]
                App.log("BackgroundKeyValues: $keyValue")
                if (key.equals("gcm.notification.body", ignoreCase = true) && keyValue != null){
                    ...
                    //Working with payload data key value - dont have title and body
                }
            }
        }
    }

Answer 1

不幸的是，这是不可能的方式，您希望它的工作。

如果推送通知在有效载荷中有通知部分，而您的app在后台，则永远不会调用onMessageReceived。通知由Firebase自动创建和显示。没有办法截取此信息并修改通知或为此进行任何其他操作。只有点击通知后，您的应用程序才会获得控制权。

当应用程序处于前台时，正如您所提到的，将始终调用onMessageReceived。

{
"registration_ids":[
  "firebase_token"
],
"data":{
    "body":"body of notification",
    "title":"title of notification",
    "otherdatakey":"otherdatavalue"
}
}

@Override
public void onMessageReceived(RemoteMessage message) {
Map<String, String> dataMap = message.getData();
String title = dataMap.get("title");
String body = dataMap.get("body");
String otherdatavalue = dataMap.get("otherdatakey");
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setContentTitle(title)
            .setContentText(body)
            .setContentIntent(pendingIntent);//To handle click of notification

}