How can I prevent the device font size effect of a Xamarin Android app?

Question

If I change the device font then it will also change my app font. I do not want to change my app font according the device font.

So I searched about this, and I found Dimension.

Please let me know how to use dp in Xamarin for Android. Also suggest me any other proper way to resolve this.

"any other proper way to resolve this" -- allow your fonts to change size based on the system font size. The user is saying "I would like larger fonts" (or possibly "I would like smaller fonts"). You, by trying to prevent this, are telling the user that you do not care what the user wants. The user, in turn, may not appreciate your app very much. — CommonsWare, Apr 04 '18 at 11:38
Yes, I agree with you. I just want for some entry to prevent font size. So I am looking for this. — Uddhao Pachrne, Apr 04 '18 at 11:50
[Here](https://stackoverflow.com/questions/40221711/android-context-getresources-updateconfiguration-deprecated) is about the `UpdateConfiguration` was deprecated. — Robbit, Apr 05 '18 at 02:44

score 11 · Answer 1 · answered Aug 14 '19 at 20:44

11

Robbit's answer is right, but Resources.UpdateConfiguration() has been deprecated. So, currently, it should be done like this:

public override Resources Resources 
{
    get
    {
        var config = new Configuration();
        config.SetToDefaults();

        return CreateConfigurationContext(config).Resources;
    }
}

answered Aug 14 '19 at 20:44

Rafael Pereira

321
4
9

this makes app crashing on orientation changes via null reference ! – user193679 Aug 23 '22 at 09:10

score 8 · Accepted Answer · answered Apr 05 '18 at 02:42

8

In your activity, add this:

public override Resources Resources {
    get
    {
        Resources res = base.Resources;
        Configuration config = new Configuration();
        config.SetToDefaults();
        res.UpdateConfiguration(config, res.DisplayMetrics);
        return res;
    }

}

answered Apr 05 '18 at 02:42

Robbit

4,300
1
13
29

Phenomenal, many thanks. Insights into iOS equivalent? Possibly in `AppDelegate`? – jtth Apr 10 '19 at 21:48
@jtth - Haven't been an issue in any iOS devices in my experience. Do you think there will be font size variations in iOS? – Abhijith C R Dec 02 '20 at 17:48
@jtth you may have found it already, but the iOS equivalent is a platform specific property set on the Application called `EnableAccessibilityScalingForNamedFontSizes` https://learn.microsoft.com/en-gb/xamarin/xamarin-forms/platform/ios/named-font-size-scaling – greg84 Jul 30 '22 at 21:45

score 8 · Answer 3 · edited Sep 30 '21 at 10:56

8

I used Rafael's answer, but I was getting this error when I tried to set Application.Current.MainPage:

Binary XML file line #1: Error inflating class <unknown>

I solved it doing this:

public override Android.Content.Res.Resources Resources
{
    get
    {
        var config = base.Resources.Configuration;
        if (config == null)
            config = new Configuration();
        config.FontScale = 1f;
        return CreateConfigurationContext(config).Resources;
    }
}

edited Sep 30 '21 at 10:56

Peter Mortensen

30,738
21
105
131

answered Oct 14 '20 at 00:55

Marlon Adarme

357
4
15

Perfect! It's better to check the config instance. – Chandan Y S Aug 11 '21 at 08:51

score 3 · Answer 4 · answered Jun 10 '21 at 03:35

In the Xamarin.Forms Android MainActivity.cs, override the Resources and set the configuration to default to restrict the font size effect on application.

public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
public override Resources Resources
        {
            get
            {
                Resources resource = base.Resources;
                Configuration configuration = new Configuration();
                configuration.SetToDefaults();
                if (Build.VERSION.SdkInt >= Build.VERSION_CODES.NMr1)
                {
                    return CreateConfigurationContext(configuration).Resources;
                }
                else
                {
                    resource.UpdateConfiguration(configuration, resource.DisplayMetrics);
                    return resource;
                }
            }
        }
}

How can I prevent the device font size effect of a Xamarin Android app?

4 Answers4

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