Toast component doesn't work into Android 11

Question

When I changed my App from 10 to 11(Android) but it doen't work with Toast Component. This is my class

public class Toast_Android : IToast
 {
 public void Show(string message)
 {
 //Toast.MakeText(Android.App.Application.Context, message, ToastLength.Long).Show();

            Toast toast = Toast.MakeText(Android.App.Application.Context, message, ToastLength.Long);

            //if (toast.View == null) return;

            //toast.SetGravity(Android.Views.GravityFlags., 0, 0);
            LinearLayout layout = (LinearLayout)toast.View;
            if (layout.ChildCount > 0)
            {
                TextView tv = (TextView)layout.GetChildAt(0);
                tv.SetForegroundGravity(GravityFlags.CenterVertical | GravityFlags.CenterHorizontal);
                //tv.TextAlignment = Android.Views.TextAlignment.Center;
            }
           // toast.SetGravity(GravityFlags.FillHorizontal | GravityFlags.Bottom, 0, 0);
            toast.Show();
        }
 }

I put in this line(if (toast.View == null) return;) just to compile my code, but is wrong, of course.

How can i change this code for other and doesn't break my app?

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

From Android Developers documentation:

Custom toast views are deprecated. Apps can create a standard text toast with the makeText(android.content.Context, java.lang.CharSequence, int)

Since Android 11, custom toasts/ toast modifications are deprecated, that is why your app in Android 30 is not able to display custom toasts, Toast component doesn't work into Android 11

So, I edited your code.

   using Android.App;  
   using Android.Content;  
   using Android.OS;  
   using Android.Runtime;  
   using Android.Views;  
   using Android.Widget;  
   using System;  
   using System.Collections.Generic;  
   using System.Linq;  
   using System.Text;  
     
   namespace XAndroidAds  
   {  
     
       public interface IToast  
       {  
     
     
           void Show(string message);  
       }  
     
       public class Toast_Android : IToast  
       {  
           
     
           public void Show(string message)  
           {  
               //Toast.MakeText(Android.App.Application.Context, message, ToastLength.Long).Show();  
     
     
     
               //if (toast.View == null) return;  
     
               //toast.SetGravity(Android.Views.GravityFlags., 0, 0);  
     
               Toast toast = Toast.MakeText(Android.App.Application.Context, message, ToastLength.Long);  
     
               if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.R)  
               {  
     
               }  
               else  
               {  
                    
                   LinearLayout layout = (LinearLayout)toast.View;  
                   if (layout.ChildCount > 0)  
                   {  
                       TextView tv = (TextView)layout.GetChildAt(0);  
                       tv.SetForegroundGravity(GravityFlags.CenterVertical | GravityFlags.CenterHorizontal);  
                       //tv.TextAlignment = Android.Views.TextAlignment.Center;  
                   }  
                    
               }  
               toast.Show();  
     
               // toast.SetGravity(GravityFlags.FillHorizontal | GravityFlags.Bottom, 0, 0);  
     
           }  
       }  
   }  

When I use Android 11 emulator, I met a known issue(Toast.makeText is not showing in Android 11 (with SDK 30 emulator) ), you can try to use cold boot of emulator.

Best Regards,

Leon Lu

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