Toast component doesn't work into Android 11

Paulo Silva 141 Reputation points
2021-07-05T11:56:03.93+00:00

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?

Xamarin
Xamarin
A Microsoft open-source app platform for building Android and iOS apps with .NET and C#.
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Accepted answer
  1. Leon Lu (Shanghai Wicresoft Co,.Ltd.) 68,016 Reputation points Microsoft Vendor
    2021-07-06T02:53:26.18+00:00

    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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