[Android] Allow custom background drawable with a custom handler

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18720.cs

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+#if ANDROID
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue18720 : _IssuesUITest
+	{
+		public Issue18720(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "Setting the background property of AppCompatEditText (Entry) in a handler mapping does not work";
+
+		[Test]
+		[Category(UITestCategories.Entry)]
+		public void SettingEntryBackgroundFromHandler()
+		{
+			App.WaitForElement("TestButton");
+			App.Tap("TestButton");
+			App.WaitForElement("CustomEntry1");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18720DatePicker.cs

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+#if ANDROID
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue18720DatePicker : _IssuesUITest
+	{
+		public Issue18720DatePicker(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "Setting the background property of AppCompatEditText (DatePicker) in a handler mapping does not work";
+
+		[Test]
+		[Category(UITestCategories.DatePicker)]
+		public void SettingDatePickerBackgroundFromHandler()
+		{
+			App.WaitForElement("TestButton");
+			App.Tap("TestButton");
+			App.WaitForElement("CustomDatePicker1");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18720Editor.cs

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+#if ANDROID
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue18720Editor : _IssuesUITest
+	{
+		public Issue18720Editor(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "Setting the background property of AppCompatEditText (Editor) in a handler mapping does not work";
+
+		[Test]
+		[Category(UITestCategories.Editor)]
+		public void SettingEditorBackgroundFromHandler()
+		{
+			App.WaitForElement("TestButton");
+			App.Tap("TestButton");
+			App.WaitForElement("CustomEditor1");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue18720TimePicker.cs

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+#if ANDROID
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue18720TimePicker : _IssuesUITest
+	{
+		public Issue18720TimePicker(TestDevice device) : base(device)
+		{
+		}
+
+		public override string Issue => "Setting the background property of AppCompatEditText (TimePicker) in a handler mapping does not work";
+
+		[Test]
+		[Category(UITestCategories.TimePicker)]
+		public void SettingTimePickerBackgroundFromHandler()
+		{
+			App.WaitForElement("TestButton");
+			App.Tap("TestButton");
+			App.WaitForElement("CustomTimePicker1");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif

src/Controls/tests/TestCases/Issues/Issue18720.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue18720"
+             xmlns:controls="clr-namespace:Maui.Controls.Sample.Issues">
+  <ContentPage.Resources>
+    <ResourceDictionary>
+
+      <Style TargetType="Button">
+        <Setter Property="HeightRequest" Value="36" />
+        <Setter Property="FontSize" Value="9" />
+      </Style>
+
+    </ResourceDictionary>
+  </ContentPage.Resources>
+  <VerticalStackLayout
+     Padding="30,0"
+     Spacing="25">
+    <VerticalStackLayout
+      x:Name="TestLayout">
+      <Label 
+        Text="BackgroundColor" />
+      <Entry      
+        x:Name="BackgroundColorEntry"/>
+      <Button    
+        x:Name="UpdateBackgroundColorButton"
+        Text="Update Background Color"
+        Clicked="OnUpdateBackgroundColorButtonClicked"/>
+      <Button
+        x:Name="ClearBackgroundColorButton"
+        Text="Clear Background Color"
+        Clicked="OnClearBackgroundColorButtonClicked"/>
+      <Label 
+        Text="Background" />
+      <Entry      
+        x:Name="BackgroundEntry"/>
+      <Button    
+        x:Name="UpdateBackgroundButton"
+        Text="Update Background"
+        Clicked="OnUpdateBackgroundButtonClicked"/>
+      <Button
+        x:Name="ClearBackgroundButton"
+        Text="Clear Background"
+        Clicked="OnClearBackgroundButtonClicked"/>
+      <Button 
+        x:Name="TestButton"
+        AutomationId="TestButton"
+        Text="Test"
+        Margin="0, 12"
+        Clicked="OnTestButtonClicked"/>
+    </VerticalStackLayout>
+    <Label 
+      Text="Custom Entry (Null Android Background)" />
+    <controls:Issue18720Entry1 
+      AutomationId="CustomEntry1"/>
+    <Label 
+      Text="Custom Entry (Custom Android Drawable)" />
+    <controls:Issue18720Entry2 
+      AutomationId="CustomEntry2"/>
+  </VerticalStackLayout>
+</ContentPage>

src/Controls/tests/TestCases/Issues/Issue18720.xaml.cs

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+using System;
+using Microsoft.Maui;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+using Microsoft.Maui.Graphics;
+using Microsoft.Maui.Hosting;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[XamlCompilation(XamlCompilationOptions.Compile)]
+	[Issue(IssueTracker.Github, 18720, "Setting the background property of AppCompatEditText (Entry) in a handler mapping does not work", PlatformAffected.Android)]
+	public partial class Issue18720 : ContentPage
+	{
+		public Issue18720()
+		{
+			InitializeComponent();
+			UpdateEntryBackgroundColor();
+			UpdateEntryBackground();
+		}
+
+		void OnUpdateBackgroundColorButtonClicked(object sender, System.EventArgs e)
+		{
+			UpdateEntryBackgroundColor();
+		}
+
+		void OnClearBackgroundColorButtonClicked(object sender, System.EventArgs e)
+		{
+			BackgroundColorEntry.BackgroundColor = null;
+		}
+
+		void OnUpdateBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			UpdateEntryBackground();
+		}
+
+		void OnClearBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			BackgroundEntry.Background = null;
+		}
+
+		void OnTestButtonClicked(object sender, EventArgs e)
+		{
+			TestLayout.IsVisible = false;
+		}
+
+		void UpdateEntryBackgroundColor()
+		{
+			Random rnd = new Random();
+			Color backgroundColor = Color.FromRgba(rnd.Next(256), rnd.Next(256), rnd.Next(256), 255);
+			BackgroundColorEntry.BackgroundColor = backgroundColor;
+		}
+
+		void UpdateEntryBackground()
+		{
+			Random rnd = new Random();
+			Color startColor = Color.FromRgba(rnd.Next(256), rnd.Next(256), rnd.Next(256), 255);
+			Color endColor = Color.FromRgba(rnd.Next(256), rnd.Next(256), rnd.Next(256), 255);
+
+			BackgroundEntry.Background = new LinearGradientBrush
+			{
+				EndPoint = new Point(1, 0),
+				GradientStops = new GradientStopCollection
+				{
+					new GradientStop { Color = startColor },
+					new GradientStop { Color = endColor, Offset = 1 }
+				}
+			};
+		}
+	}
+
+	public class Issue18720Entry1 : Entry
+	{
+
+	}
+
+	public class Issue18720Entry2 : Entry
+	{
+
+	}
+
+	public static class Issue18720Extensions
+	{
+		public static MauiAppBuilder Issue18720AddMappers(this MauiAppBuilder builder)
+		{
+			builder.ConfigureMauiHandlers(handlers =>
+			{
+				Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping(nameof(Issue18720Entry1), (handler, view) =>
+				{
+					if (view is Issue18720Entry1)
+					{
+#if ANDROID
+						handler.PlatformView.Background = null;
+						handler.PlatformView.SetBackgroundColor(Android.Graphics.Color.Pink);
+						handler.PlatformView.SetTextColor(Android.Graphics.Color.WhiteSmoke);
+#endif
+					}
+				});
+
+				Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping(nameof(Issue18720Entry2), (handler, view) =>
+				{
+					if (view is Issue18720Entry2)
+					{
+#if ANDROID
+						Android.Graphics.Drawables.GradientDrawable gd = new Android.Graphics.Drawables.GradientDrawable();
+						gd.SetCornerRadius(10);
+						gd.SetStroke(2, Android.Graphics.Color.Violet);
+						handler.PlatformView.Background = gd;
+						handler.PlatformView.SetTextColor(Android.Graphics.Color.DeepPink);
+#endif
+					}
+				});
+			});
+
+			return builder;
+		}
+	}
+}

src/Controls/tests/TestCases/Issues/Issue18720DatePicker.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue18720DatePicker"
+             xmlns:controls="clr-namespace:Maui.Controls.Sample.Issues">
+  <ContentPage.Resources>
+    <ResourceDictionary>
+
+      <Style TargetType="Button">
+        <Setter Property="HeightRequest" Value="36" />
+        <Setter Property="FontSize" Value="9" />
+      </Style>
+
+    </ResourceDictionary>
+  </ContentPage.Resources>
+  <VerticalStackLayout
+     Padding="30,0"
+     Spacing="25">
+    <VerticalStackLayout
+      x:Name="TestLayout">
+      <Label 
+        Text="BackgroundColor" />
+      <DatePicker      
+        x:Name="BackgroundColorDatePicker"/>
+      <Button    
+        x:Name="UpdateBackgroundColorButton"
+        Text="Update Background Color"
+        Clicked="OnUpdateBackgroundColorButtonClicked"/>
+      <Button
+        x:Name="ClearBackgroundColorButton"
+        Text="Clear Background Color"
+        Clicked="OnClearBackgroundColorButtonClicked"/>
+      <Label 
+        Text="Background" />
+      <DatePicker      
+        x:Name="BackgroundDatePicker"/>
+      <Button    
+        x:Name="UpdateBackgroundButton"
+        Text="Update Background"
+        Clicked="OnUpdateBackgroundButtonClicked"/>
+      <Button
+        x:Name="ClearBackgroundButton"
+        Text="Clear Background"
+        Clicked="OnClearBackgroundButtonClicked"/>
+      <Button 
+        x:Name="TestButton"
+        AutomationId="TestButton"
+        Text="Test"
+        Margin="0, 12"
+        Clicked="OnTestButtonClicked"/>
+    </VerticalStackLayout>
+    <Label 
+      Text="Custom DatePicker (Null Android Background)" />
+    <controls:Issue18720DatePicker1 
+      AutomationId="CustomDatePicker1"/>
+    <Label 
+      Text="Custom DatePicker (Custom Android Drawable)" />
+    <controls:Issue18720DatePicker2 
+      AutomationId="CustomDatePicker2"/>
+  </VerticalStackLayout>
+</ContentPage>