从 Firebase 通知恢复应用程序不起作用(Xamarin Forms)

Resume App from a Firebase Notification is not working (Xamarin Forms)

我正在努力将 firebase 推送通知 集成到我的应用程序中。

请找到我的 firebase FirebaseMessagingService class.

如果应用程序已打开并且 运行 一切正常。但是如果应用程序未打开/如果我切换到其他应用程序(我的应用程序未关闭)。我收到通知,但当我点击“通知”时,它会重新启动应用程序而不恢复。

我在主 activity 中使用启动模式 LaunchMode = LaunchMode.SingleTop

如果应用程序打开,我会在 OnNewIntent 主 activity 覆盖方法中得到响应。

谁能帮我弄清楚真正的原因。请帮忙。

    [Service]
    [IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
    public class DriverAppMessagingService : FirebaseMessagingService
    {
        #region Overriden Methods

        public override void OnMessageReceived(RemoteMessage message)
        {
            base.OnMessageReceived(message);
            var parameters = new Dictionary<string, object>();
            var notification = message.GetNotification();
            if (null != notification)
            {
                if (!string.IsNullOrEmpty(notification.Body))
                {
                    parameters.Add("Body", notification.Body);
                }

                if (!string.IsNullOrEmpty(notification.BodyLocalizationKey))
                {
                    parameters.Add("BodyLocalizationKey", notification.BodyLocalizationKey);
                }

                // convert the incoming message to a local notification
                SendLocalNotification(parameters);

                // send the incoming message directly to the MainActivty
                SendNotificationToMainActivity(parameters);
            }
        }

        public override void OnNewToken(string p0)
        {
            base.OnNewToken(p0);
            //Persist the token to app settings for registration purpose.
            AppDefinition.Helpers.Settings.Current.PnsHandle = p0;
        }

        #endregion

        #region Private Methods
        /// <summary>
        /// 
        /// </summary>
        /// <param name="args"></param>
        private void SendNotificationToMainActivity(Dictionary<string, object> args)
        {
            if (CrossCurrentActivity.Current.Activity is MainActivity activity)
            {
                var message = args["Body"].ToString();
                activity.TriggerPushNotification(message);
            }
        }

        /// <summary>
        /// Method to trigger the local notification.
        /// </summary>
        /// <param name="args"></param>
        private void SendLocalNotification(Dictionary<string, object> args)
        {
            //TODO Only using one token from message response.
            var message = args["Body"].ToString();

            var intent = new Intent(CrossCurrentActivity.Current.Activity, typeof(MainActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            intent.PutExtra("message", message);

            var pendingIntent = PendingIntent.GetActivity(CrossCurrentActivity.Current.Activity, 0, intent, PendingIntentFlags.UpdateCurrent | PendingIntentFlags.OneShot);

            var notificationBuilder = new NotificationCompat.Builder(CrossCurrentActivity.Current.Activity, Constants.NotificationChannelName)
                .SetContentTitle(Constants.ContentTitle)
                .SetSmallIcon(Resource.Drawable.ic_stat_ic_notification)
                .SetContentText(message)
                .SetAutoCancel(true)
                .SetShowWhen(false)
                .SetLights(0xff0000, 100, 100)
                .SetContentIntent(pendingIntent);

            if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
            {
                notificationBuilder.SetChannelId(Constants.NotificationChannelName);
            }
            var notificationManager = NotificationManager.FromContext(CrossCurrentActivity.Current.Activity);
            notificationManager.Notify(0, notificationBuilder.Build());
        }
        #endregion
    }

当您设置 MainActivity LaunchMode = LaunchMode.SingleTop 并设置 ActivityFlags.ClearTop 时,当您点击通知打开您的应用程序时,它将清除 MainActivity 之上的所有活动并将 MainActivity 放在堆栈的顶部。 而不是重新创建MainActivity,而是进入OnNewIntent方法

可以在OnCreate方法中打断点,点击通知后打开应用程序时,不会进入。

数据消息 - 由客户端应用处理。即使您的应用程序处于 foreground/background/killed,这些消息也会触发 onMessageReceived() 回调。使用此类消息时,您是提供 UI 并在 Android 设备上收到推送通知时处理的人。

{
    "data": {
        "message" : "my_custom_value",
        "other_key" : true,
        "body":"test"
     },
     "priority": "high",
     "condition": "'general' in topics"
}

试试这个,这将解决您的问题。