Java.Lang.NullPointerException when show Popup.

[Nguyen Khoa Lu]

Notify: Java.Lang.NullPointerException: 'Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference'

Source:

private static SfPopupLayout popupAlert;

 public static async Task DisplayAlert(string title, string message, string btnAccept)

        {

            if (popupAlert != null)

                popupAlert.IsOpen = false;

            popupAlert = new SfPopupLayout();

            if (string.IsNullOrEmpty(title))

                popupAlert.PopupView.ShowHeader = false;

            popupAlert.PopupView.PopupStyle.AcceptButtonTextColor = Color.FromHex("#3F51B5");

            popupAlert.StaysOpen = true;

            popupAlert.PopupView.ShowCloseButton = false;

            popupAlert.PopupView.AnimationMode = AnimationMode.None;

            popupAlert.PopupView.AutoSizeMode = AutoSizeMode.Height;

            popupAlert.PopupView.HeaderTitle = title;

            popupAlert.PopupView.AcceptButtonText = "    " + btnAccept + "    ";

            popupAlert.PopupView.ContentTemplate = ContentAlert(message);

            popupAlert.IsOpen = true;

            while (popupAlert.IsOpen)

            {

                await Task.Delay(100);

            }

        }

My issue:

- I call my method DisplayAlert when Load application. My Page.Content  is SfPopupLayout (X) , but when MainActivity call method LoadApplication(new App()), X has not been contructor. And X.Content has not been show. 

- And I have the error when using popupAlert.IsOpen = true; I need solution, And I think we need the Variable popupAlert.CanOpen...etc. I was tried Try Catch but it not working. 

Thanks you

[Nguyen Khoa Lu]

Who can help me? Please

[Deepika Balasubramaniyan]

Hi Nguyen Khoa Lu,

Thank you for contacting Syncfusion support.

We have checked reported issue “Java.Lang.NullPointerException when show Popup” with given settings, We are unable to replicate the issue from our side. As you instructed Popup settings added method named as “DisplayAlert” has called when load application. When load the page, popup has open with out any crash as expected. For your reference we have attached the tested sample following here. If the sample doesn’t meet your requirement, kindly modify the sample based on your scenario and revert us back with replication procedure and with following details,it will be helpful for us to give you a better solution.

      1. SfPopupLayout Product version

2. Xamarin Forms version

3. Issue replicated Android device

Sample link:

https://www.syncfusion.com/downloads/support/forum/150197/ze/F1501971503577096.zip

Regards,

Deepika.

[Rubén]

Hi Nguyen Khoa Lu,

Thank you for contacting Syncfusion support.

We have checked reported issue “Java.Lang.NullPointerException when show Popup” with given settings, We are unable to replicate the issue from our side. As you instructed Popup settings added method named as “DisplayAlert” has called when load application. When load the page, popup has open with out any crash as expected. For your reference we have attached the tested sample following here. If the sample doesn’t meet your requirement, kindly modify the sample based on your scenario and revert us back with replication procedure and with following details,it will be helpful for us to give you a better solution.

      1. SfPopupLayout Product version

2. Xamarin Forms version

3. Issue replicated Android device

Sample link:

https://www.syncfusion.com/downloads/support/forum/150197/ze/F1501971503577096.zip

Regards,

Deepika.

hay alguna solucion al respecto?

[Pradhap Palani]

Hi Nguyen Khoa Lu, 

 

Thank you for contacting Syncfusion support.  

 

Based on the provided call stack, you missed to initialize SfPopupLayoutRenderer in the Android project of your application. Please let me know whether you are facing mentioned call stack issue or any other issues? if you are facing the call stack issues, you must initialize the Popup renderer in the MainActivity.cs file as described in our UG documentation or the below code snippet. 

 

UG link: https://help.syncfusion.com/xamarin/popup/getting-started 

 

 

protected override void OnCreate(Bundle bundle) 

{ 

    ... 

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

    Syncfusion.XForms.Android.PopupLayout.SfPopupLayoutRenderer.Init(); 

           Or  

   // this refers to application context or Main Activity 

    Syncfusion.XForms.Android.PopupLayout.SfPopupLayoutRenderer.Init(this); 

    LoadApplication(new App()); 

} 

 

Please let us know if you need any further assistance 

 

Regards, 

Pradhap Palani 

[Robert Manegene]

Hi,

Expericnced similar issue in after upgrading xamarin forms to version 5.. and Android project to Android X.

Adding 

    Syncfusion.XForms.Android.PopupLayout.SfPopupLayoutRenderer.Init(this); 

in the Adnroid Mainactivity class fixed the problem

Regards,

Robert M

[Karthikraja Kalaimani]

Hi Robert,

Thanks for the update. We glad to know that the previously provided solution has fix your problem. Please let us know if you need further assistance from us. 

Regards,
Karthik Raja