I can't inherit from NotificationManager

Question

I can't inherit from Android.App.NotificationManager:

 public class myNotificationManager : NotificationManager  
    {  
        protected myNotificationManager(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)  
        {  
      
        }  
    }  

I have no C# error, but when I build the project I get this error:

error: constructor NotificationManager in class NotificationManager cannot be applied to given types;  
public class myNotificationManager  
required: Context,Handler  
found: no arguments  
reason: actual and formal argument lists differ in length App2      
C:\Workspaces\Sandbox\App2\App2\obj\Debug\90\android\src\crc64bb1b55f618e11607\myNotificationManager.java  

I understand the message but according to the dotnet documentation: NotificationManager Constructor the type of the constructor's parameters is IntPtr and JniHandleOwnership not Context and Handler.

From the Android documentation I dont see any public constructor

Android target framework version: v9.0 (API 28)
Android SDK Plateform installed: 28,29,30

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

If we click into the source code of NotificationManager.cs in xamarin android ,we will find the function as follows:

The type of class NotificationManager is static , so we can use NotificationManager in the following way:

        var channel = new NotificationChannel(CHANNEL_ID, name, NotificationImportance.Default)  
                      {  
                          Description = description  
                      };  
         var notificationManager = (NotificationManager) GetSystemService(NotificationService);  
        notificationManager.CreateNotificationChannel(channel);  

Best Regards,

Jessie Zhang

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