如何在FCM通知点击Xamarin表单后打开内容页？

我已经在xamarin forms android上实现了FCM通知。所以我想，当用户单击通知时，它将打开xamarin forms内容页。 以下是我接收FCM通知的代码： MyFireMessagingService类内部-

public override void OnMessageReceived(RemoteMessage message)
        {
            base.OnMessageReceived(message);
            SendNotificatios(message.GetNotification().Body, message.GetNotification().Title);
        }
        public void SendNotificatios(string body, string Header)
        {
            Notification.Builder builder = new Notification.Builder(this);
            builder.SetSmallIcon(Resource.Drawable.AppLauncher);
            var intent = new Intent(this, typeof(MainActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            PendingIntent pendingIntent = PendingIntent.GetActivity(this, 0, intent, 0);
            builder.SetContentIntent(pendingIntent);
            builder.SetLargeIcon(BitmapFactory.DecodeResource(Resources, Resource.Drawable.AppLauncher));
            builder.SetContentTitle(Header);
            builder.SetContentText(body);
            builder.SetDefaults(NotificationDefaults.Sound);
            builder.SetAutoCancel(true);
            NotificationManager notificationManager = (NotificationManager)GetSystemService(NotificationService);
            notificationManager.Notify(1, builder.Build());
        }

---

那么，如何在单击通知后打开内容页呢？

作为我替换的第一件事

public override void OnMessageReceived(RemoteMessage message)
    {
        base.OnMessageReceived(message);
        SendNotificatios(message.GetNotification().Body, message.GetNotification().Title);
    }

与

然后创建了一个新方法CreateNotification，如下所示

private void CreateNotification(Object e)
    {
        try
        {
            string title = "";
            string body = "";

            var intent = new Intent(this, typeof(MainActivity));

            var i = e as Intent;
            var bundle  = i.Extras;
            title = bundle.GetString("gcm.notification.title");
            body = bundle.GetString("gcm.notification.body");


            intent.PutExtra("title", title);
            intent.PutExtra("body", body);

            intent.AddFlags(ActivityFlags.ClearTop | ActivityFlags.SingleTop );
            var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.CancelCurrent | PendingIntentFlags.UpdateCurrent);
            Notification.Builder builder = new Notification.Builder(this);
            builder.SetSmallIcon(Resource.Drawable.AppLauncher);
            builder.SetContentIntent(pendingIntent);
            builder.SetLargeIcon(BitmapFactory.DecodeResource(Resources, Resource.Drawable.AppLauncher));
            builder.SetContentTitle(Header);
            builder.SetContentText(body);
            builder.SetDefaults(NotificationDefaults.Sound);
            builder.SetAutoCancel(true);
            NotificationManager notificationManager = (NotificationManager)GetSystemService(NotificationService);
            notificationManager.Notify(1, builder.Build());

        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

现在，我们必须更新MainActivity.cs，通过覆盖OnNewIntent方法来处理推送通知单击，如下所示

protected async override void OnNewIntent(Intent intent)
    {
        base.OnNewIntent(intent);
        var title = intent.GetStringExtra("title");
        //This method will get called while the app is launching from the app icon or from the notification
        if (title != null)
        {
            //Means new Intent from push notification
            //Code to open the page
        }
    }

---

确保您在活动中保留了LaunchMode=LaunchMode.SingleTask

好问题，使用Xamarin Android，您只需在您的意图中添加一个额外的内容，即可从您用intent.GetStringExtra指示的活动中处理它，但这里只有一个活动。。。我认为有解决方法，比如Montemagno解决了权限问题（），我担心我不够专业。PermissionsPlugin不是解决这个问题的解决方案。我不是说它解决了这个问题，只是方法可能类似。因为理论上，对于权限，您必须在每个活动中处理它们，而在Xamarin表单中只有一个。

protected async override void OnNewIntent(Intent intent)
    {
        base.OnNewIntent(intent);
        var title = intent.GetStringExtra("title");
        //This method will get called while the app is launching from the app icon or from the notification
        if (title != null)
        {
            //Means new Intent from push notification
            //Code to open the page
        }
    }