Looking to remove underline from Android Entry and Pickers in .NET Maui

Question

I need to remove the underline in my .NET Maui application for entry and picker handlers. In addition to this, I need to set the background color to a custom color that I have. I have found ways to set the background color to transparent to remove the underline, but this does not allow me to then change the background color I have seen the following code to remove the underline, but it overrides any BackgroundColor setting on my pages Xaml.

protected override MauiApp CreateMauiApp()
    {
        // Remove Entry control underline
        Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("NoUnderline", (h, v) =>
        {
            h.PlatformView.BackgroundTintList =
                Android.Content.Res.ColorStateList.ValueOf(Colors.Transparent.ToAndroid());
        });

        return MauiProgram.CreateMauiApp();
    }

Answer 1

Hello,

If you need to remove the underline and change the background color at the same time, just replace Transparent with the color you need.

Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("NoUnderline", (h, v) =>
{
	h.PlatformView.BackgroundTintList =
	Android.Content.Res.ColorStateList.ValueOf(Colors.Red.ToAndroid());
});

For one specific page, I need it transparent. For the rest, I need it Red. How would I implement this?

To achieve this requirement, you need to write this method in the construction method of the corresponding page, not in the CreateMauiApp method.

For example, you have two pages, one called MainPage and one called NewPage1. You need to make MainPage transparent and set the background color to red in NewPage1.

MainPage.cs:

public MainPage(){
	InitializeComponent();
	Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("NoUnderline", (h, v) =>{	h.PlatformView.BackgroundTintList =	Android.Content.Res.ColorStateList.ValueOf(Colors.Transparent.ToAndroid());
}

NewPage1.cs:

csharp
public NewPage1(){

	InitializeComponent();
	Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("NoUnderline", (h, v) =>{	h.PlatformView.BackgroundTintList =	Android.Content.Res.ColorStateList.ValueOf(Colors.Red.ToAndroid());
}

Best Regards, Alec Liu.

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