Java.Lang.IllegalArgumentException .NET MAUI

Question

After installing BarcodeScanner.Mobile version 8.0.0.1 I get this exception when the application starts: MAUI Java.Lang.IllegalArgumentException: 'This component requires that you specify a valid TextAppearance attribute. Update your app theme to inherit from Theme.MaterialComponents (or a descendant).'

Does anyone got the same experience?

In your Android project in MainActivity, what does the ActivityAttbitute look like? — Cheesebaron
– Cheesebaron, Commented Apr 24, 2024 at 7:54
@Cheesebaron I don't have any attribute: [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)] — Rajzer
– Rajzer, Commented Apr 24, 2024 at 13:06

Rajzer · Accepted Answer · 2024-04-24 19:07:56Z

1

I don't know which part of my app requires an Material design but this is what I do to fix this crash:

In Platform/Android/Resources/values added styles.xml and inside added this code:

<?xml version="1.0" encoding="utf-8" ?>
<resources>
   <style name="AppTheme" parent="Theme.MaterialComponents.Light.Bridge">
       <!-- Customize your theme here. -->
       <item name="colorPrimary">@color/colorPrimary</item>
       <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
       <item name="colorAccent">@color/colorAccent</item>
   </style>
</resources>

Make styles.xml Build Action AndroidResource
In AndroidManifest.xml in the <manifest> tag added this lines of code:xmlns:tools="http://schemas.android.com/tools" android:theme="@style/AppTheme" tools:replace="android:theme"
In MainActivity.cs replace the Theme attribute property like this: [Activity(Theme = "@style/AppTheme"....)]

All this changes fixed my problem with the Java.Lang.IllegalArgumentException

edited Apr 24, 2024 at 19:07

answered Apr 24, 2024 at 18:18

Rajzer

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2 Comments

Bungler Feb 2 at 23:57

This worked for me in .Net 9 and MAUI

nord Sep 18 at 13:39

This worked for me in .Net 10 and MAUI. Thanks!

sql_dru · Accepted Answer · 2025-11-10 17:44:23Z

0

Just adding as an answer that I when I got this error, I cleaned and built my solution and it resolved the error. Try a Clean then Build before more complicated steps.

answered Nov 10 at 17:44

sql_dru

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