Btukfyl

I am developing firebase push notifications in Xamarin.Forms using FirebasePushNotificationPlugin. Somehow I am getting notifications for android project in Application file, along with data

CrossFirebasePushNotification.Current.OnNotificationReceived += (s, p) =>

{

    //System.Diagnostics.Debug.WriteLine("NOTIFICATION RECEIVED", p.Data);

    var data = p.Data; //Dictionary type

};

Based on above data how can I navigate to specific Page except MainPage()?

This is my App.xaml.cs file in Shared project

public App()

{

    InitializeComponent();

    MainPage = new MainPage();

}

MainActivity.cs class in Android project

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity

{

    protected override void OnCreate(Bundle savedInstanceState)

    {

        TabLayoutResource = Resource.Layout.Tabbar;

        ToolbarResource = Resource.Layout.Toolbar;



        base.OnCreate(savedInstanceState);

        global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

        LoadApplication(new App());



        FirebasePushNotificationManager.ProcessIntent(this, Intent);

    }



    protected override void OnNewIntent(Intent intent)

    {

        base.OnNewIntent(intent);

        FirebasePushNotificationManager.ProcessIntent(this, intent);

    }

}

Edit 1:
According to @G.Hakim answer below code always opening NotificationsPage without sending notification(Except first time. Only first time opening MainPage when executing app). If I click on app it always goes to NotificationsPage instead of MainPage.

MainActivity.cs

protected override void OnCreate(Bundle savedInstanceState)

{

    TabLayoutResource = Resource.Layout.Tabbar;

    ToolbarResource = Resource.Layout.Toolbar;



    base.OnCreate(savedInstanceState);

    global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

    LoadApplication(new App(false,null));



    FirebasePushNotificationManager.ProcessIntent(this, Intent);

    CrossFirebasePushNotification.Current.OnNotificationOpened += (s, p) =>

    {

        System.Diagnostics.Debug.WriteLine("NOTIFICATION RECEIVED", p.Data);

        var data = p.Data;

        DependencyService.Get<IToast>().DisplayTost("opened notifications");

        LoadApplication(new App(true, p));

    };

}

App.xaml.cs

public App(bool hasNotification = false, object notificationData = null)

{

    if (hasNotification)

    {

        MainPage = new NotificationsPage();

    }

    else

    {

        MainPage = new MainPage();

    }

}

It's actually very simple you can do it using some trickery:

• First, call the MainActivity from your notification so that you can use the existing xamarin forms loading functionality.



• 
  

  Then maintain a bool on your App class constructor something like this:

  
  
  

  public App(bool hasNotification=false,object notificationData=null)
  
  {
  
     if(hasNotification)
  
     {//case where you receive a notification} // call your normal functionality here 
  
     else
  
     {//case where you do not recieve a notification} // notification functionality here
  
  }
  
  

  
  


• 
  

  Now here is the trick that steals the show, When you receive a notification in your MainActivity pass the bool as true in the load app method and pass the data if anything is present in the notification.Something like this:

  
  
  

  LoadApplication(new App(true,*yourData*))
  
  

  
  

Note: I have defined the optional parameter in the constructor so you can even use the empty app constructor to make it work;

Update:

private bool IsNotification=false;

private object NotificationData;

   protected override void OnCreate(Bundle savedInstanceState)

 {

   TabLayoutResource = Resource.Layout.Tabbar;

   ToolbarResource = Resource.Layout.Toolbar;



    base.OnCreate(savedInstanceState);

    global::Xamarin.Forms.Forms.Init(this, savedInstanceState);

    FirebasePushNotificationManager.ProcessIntent(this, Intent);    

    CrossFirebasePushNotification.Current.OnNotificationOpened += (s, p) =>

    {

       System.Diagnostics.Debug.WriteLine("NOTIFICATION RECEIVED", p.Data);

       NotificationData = p.Data;

       IsNotification=false;

       DependencyService.Get<IToast>().DisplayTost("opened notifications");           

    };

   if(IsNotification)

    LoadApplication(new App(IsNotification,NotificationData)); 

   else

    LoadApplication(new App());

 }

This issue has been solved by sending color key from notification payload.

CrossFirebasePushNotification.Current.OnNotificationOpened += (s, p) =>

{

    if (p.Data.ContainsKey("color"))

    {

        Device.BeginInvokeOnMainThread(() =>

        {

            Xamarin.Forms.Application.Current.MainPage.Navigation.PushModalAsync(new NotificationsPage()

            {

                BackgroundColor = Color.FromHex($"{p.Data["color"]}")

            });

        });

    }

};

Note: Above code is working when app open & in background. Not working for foreground. For more information visit this ticket.