Create own theme on Android in .NET MAUI

Question

On Android in .NET MAUI there is the MainActivity in the Platforms -> Android folder, which is structured as follows by default:

[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]  
public class MainActivity : MauiAppCompatActivity  
{  
}  

It uses the theme "@STYLE /Maui.SplashTheme". Is this automatically generated at compile time? How can I create my own theme where I can add my own values and that inherits from SplashTheme?

Answer 1

Hello,

Referring to this official documentation Add a splash screen to a .NET MAUI app project, you could find the following content:

On Android, the splash screen is added to your app package as Resourcs/values/maui_colors.xml and Resources/drawable/maui_splash_image.xml.
.NET MAUI apps use the Maui.SplashTheme by default, which ensures that a splash screen will be displayed if present. Therefore, you should not specify a different theme in your manifest file or in your MainActivity class.

Therefore, it is not recommended to replace the Maui.SplashTheme.

If you want to theme your MAUI app, please refer to Theme an app.

Best Regards,

Alec Liu.

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Answer 2

I wish people would ANSWER THE QUESTION instead of saying, "You're not supposed to do this."

You inherit it in your own theme just like every other Android app.

Project/Platforms/Android/Resources/styles.xml:

<?xml version="1.0" encoding="utf-8" ?>
<resources>
    <style name="MyAppTheme" parent="Maui.SplashTheme">
        <item name="android:colorPrimary">#ff00ff</item>
        <item name="android:colorPrimaryDark">#00ff00</item>
    </style>
</resources>

Project/Platforms/Android/MainActivity.cs

namespace Project
{

    [Activity(Theme = "@style/MyAppTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density, ScreenOrientation = ScreenOrientation.Portrait)]
    public class MainActivity : MauiAppCompatActivity
    {