[Android] Allow to update Entry Background (once established)

src/Controls/samples/Controls.Sample/Pages/Controls/DatePickerPage.xaml

@@ -39,6 +39,19 @@
                     </LinearGradientBrush>
                 </DatePicker.Background>
             </DatePicker>
+            <Label
+                Text="Background"
+                Style="{StaticResource Headline}" />
+            <DatePicker 
+                x:Name="BackgroundDatePicker"/>
+            <Button
+                x:Name="UpdateBackgroundButton"
+                Text="Update Background"
+                Clicked="OnUpdateBackgroundButtonClicked"/>
+            <Button
+                x:Name="ClearBackgroundButton"
+                Text="Clear Background"
+                Clicked="OnClearBackgroundButtonClicked"/>
             <Label
                 Text="Default with date"
                 Style="{StaticResource Headline}"/>

src/Controls/samples/Controls.Sample/Pages/Controls/DatePickerPage.xaml.cs

@@ -1,4 +1,7 @@
-using System.Diagnostics;
+using System;
+using System.Diagnostics;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
 
 namespace Maui.Controls.Sample.Pages
 {
@@ -7,6 +10,35 @@ public partial class DatePickerPage
 		public DatePickerPage()
 		{
 			InitializeComponent();
+
+			UpdateDatePickerBackground();
+		}
+
+		void OnUpdateBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			UpdateDatePickerBackground();
+		}
+
+		void OnClearBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			BackgroundDatePicker.Background = null;
+		}
+
+		void UpdateDatePickerBackground()
+		{
+			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);
+
+			BackgroundDatePicker.Background = new LinearGradientBrush
+			{
+				EndPoint = new Point(1, 0),
+				GradientStops = new GradientStopCollection
+				{
+					new GradientStop { Color = startColor },
+					new GradientStop { Color = endColor, Offset = 1 }
+				}
+			};
 		}
 
 		void OnFocusDatePickerFocused(object sender, Microsoft.Maui.Controls.FocusEventArgs e)

src/Controls/samples/Controls.Sample/Pages/Controls/EditorPage.xaml

@@ -89,6 +89,19 @@
                         </LinearGradientBrush>
                     </Editor.Background>
                 </Editor>
+                <Label
+                    Text="Background"
+                    Style="{StaticResource Headline}" />
+                <Editor 
+                    x:Name="BackgroundEditor"/>
+                <Button
+                    x:Name="UpdateBackgroundButton"
+                    Text="Update Background"
+                    Clicked="OnUpdateBackgroundButtonClicked"/>
+                <Button
+                    x:Name="ClearBackgroundButton"
+                    Text="Clear Background"
+                    Clicked="OnClearBackgroundButtonClicked"/>
                 <Label
                     Text="Keyboard Numeric"
                     Style="{StaticResource Headline}" />

src/Controls/samples/Controls.Sample/Pages/Controls/EditorPage.xaml.cs

@@ -1,5 +1,6 @@
 using System;
 using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
 
 namespace Maui.Controls.Sample.Pages
 {
@@ -8,6 +9,8 @@ public partial class EditorPage
 		public EditorPage()
 		{
 			InitializeComponent();
+
+			UpdateEditorBackground();
 		}
 
 		void OnEditorCompleted(object sender, EventArgs e)
@@ -27,5 +30,32 @@ void OnEditorUnfocused(object sender, FocusEventArgs e)
 			var text = ((Editor)sender).Text;
 			DisplayAlert("Unfocused", text, "Ok");
 		}
+
+		void OnUpdateBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			UpdateEditorBackground();
+		}
+
+		void OnClearBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			BackgroundEditor.Background = null;
+		}
+
+		void UpdateEditorBackground()
+		{
+			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);
+
+			BackgroundEditor.Background = new LinearGradientBrush
+			{
+				EndPoint = new Point(1, 0),
+				GradientStops = new GradientStopCollection
+				{
+					new GradientStop { Color = startColor },
+					new GradientStop { Color = endColor, Offset = 1 }
+				}
+			};
+		}
 	}
 }

src/Controls/samples/Controls.Sample/Pages/Controls/EntryPage.xaml

@@ -5,6 +5,35 @@
     xmlns:views="clr-namespace:Maui.Controls.Sample.Pages.Base"
     xmlns:viewmodels="clr-namespace:Maui.Controls.Sample.ViewModels"
     Title="Entry">
+    <views:BasePage.Resources>
+        <ResourceDictionary>
+
+            <Style x:Key="EntryVisualStatesStyle" TargetType="Entry">
+                <Setter Property="VisualStateManager.VisualStateGroups">
+                    <VisualStateGroupList>
+                        <VisualStateGroup x:Name="CommonStates">
+                            <VisualState x:Name="Normal">
+                                <VisualState.Setters>
+                                    <Setter Property="BackgroundColor" Value="Pink"/>
+                                </VisualState.Setters>
+                            </VisualState>
+                            <VisualState x:Name="Focused">
+                                <VisualState.Setters>
+                                    <Setter Property="BackgroundColor" Value="Yellow"/>
+                                </VisualState.Setters>
+                            </VisualState>
+                            <VisualState x:Name="Disabled">
+                                <VisualState.Setters>
+                                    <Setter Property="BackgroundColor" Value="Red" />
+                                </VisualState.Setters>
+                            </VisualState>
+                        </VisualStateGroup>
+                    </VisualStateGroupList>
+                </Setter>
+            </Style>
+
+        </ResourceDictionary>
+    </views:BasePage.Resources>
     <views:BasePage.BindingContext>
         <viewmodels:EntryViewModel />
     </views:BasePage.BindingContext>
@@ -121,6 +150,24 @@
                         </LinearGradientBrush>
                     </Entry.Background>
                 </Entry>
+                <Label
+                    Text="Background"
+                    Style="{StaticResource Headline}" />
+                <Entry 
+                    x:Name="BackgroundEntry"/>
+                <Button
+                    x:Name="UpdateBackgroundButton"
+                    Text="Update Background"
+                    Clicked="OnUpdateBackgroundButtonClicked"/>
+                <Button
+                    x:Name="ClearBackgroundButton"
+                    Text="Clear Background"
+                    Clicked="OnClearBackgroundButtonClicked"/>
+                <Label
+                    Text="Updating Background using VisualStates"
+                    Style="{StaticResource Headline}" />
+                <Entry 
+                    Style="{StaticResource EntryVisualStatesStyle}" />
                 <Label
                     Text="Keyboard Numeric"
                     Style="{StaticResource Headline}" />

src/Controls/samples/Controls.Sample/Pages/Controls/EntryPage.xaml.cs

@@ -1,6 +1,7 @@
 using System;
 using Microsoft.Maui.Controls;
 using Microsoft.Maui.Controls.PlatformConfiguration.AndroidSpecific;
+using Microsoft.Maui.Graphics;
 using Entry = Microsoft.Maui.Controls.Entry;
 
 namespace Maui.Controls.Sample.Pages
@@ -19,9 +20,10 @@ public EntryPage()
 			sldCursorPosition.Maximum = entryCursor.Text.Length;
 			sldCursorPosition.Value = entryCursor.CursorPosition;
 
-
 			PlatformSpecificEntry.On<Microsoft.Maui.Controls.PlatformConfiguration.Android>()
 				.SetImeOptions(ImeFlags.Search);
+
+			UpdateEntryBackground();
 		}
 
 		void OnSlideCursorPositionValueChanged(object sender, ValueChangedEventArgs e)
@@ -67,5 +69,32 @@ void OnEntryUnfocused(object sender, FocusEventArgs e)
 			var text = ((Entry)sender).Text;
 			DisplayAlert("Unfocused", text, "Ok");
 		}
+
+		void OnUpdateBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			UpdateEntryBackground();
+		}
+
+		void OnClearBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			BackgroundEntry.Background = null;
+		}
+
+		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 }
+				}
+			};
+		}
 	}
 }

src/Controls/samples/Controls.Sample/Pages/Controls/PickerPage.xaml.cs

@@ -20,6 +20,8 @@ public PickerPage()
 
 			BindingContext = this;
 
+			UpdatePickerBackground();
+
 			Loaded += (s, e) =>
 			{
 				DynamicItemsPicker.Items.Add("Item 1");

src/Controls/samples/Controls.Sample/Pages/Controls/TimePickerPage.xaml

@@ -39,6 +39,19 @@
                     </LinearGradientBrush>
                 </DatePicker.Background>
             </TimePicker>
+            <Label
+                Text="Background"
+                Style="{StaticResource Headline}" />
+            <TimePicker 
+                x:Name="BackgroundTimePicker"/>
+            <Button
+                x:Name="UpdateBackgroundButton"
+                Text="Update Background"
+                Clicked="OnUpdateBackgroundButtonClicked"/>
+            <Button
+                x:Name="ClearBackgroundButton"
+                Text="Clear Background"
+                Clicked="OnClearBackgroundButtonClicked"/>
             <Label
                 Text="Default with time"
                 Style="{StaticResource Headline}"/>

src/Controls/samples/Controls.Sample/Pages/Controls/TimePickerPage.xaml.cs

@@ -1,10 +1,43 @@
-namespace Maui.Controls.Sample.Pages
+using System;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace Maui.Controls.Sample.Pages
 {
 	public partial class TimePickerPage
 	{
 		public TimePickerPage()
 		{
 			InitializeComponent();
+
+			UpdateTimePickerBackground();
+		}
+
+		void OnUpdateBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			UpdateTimePickerBackground();
+		}
+
+		void OnClearBackgroundButtonClicked(object sender, System.EventArgs e)
+		{
+			BackgroundTimePicker.Background = null;
+		}
+
+		void UpdateTimePickerBackground()
+		{
+			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);
+
+			BackgroundTimePicker.Background = new LinearGradientBrush
+			{
+				EndPoint = new Point(1, 0),
+				GradientStops = new GradientStopCollection
+				{
+					new GradientStop { Color = startColor },
+					new GradientStop { Color = endColor, Offset = 1 }
+				}
+			};
 		}
 	}
 }

src/Core/src/Graphics/PaintExtensions.Android.cs

@@ -5,7 +5,7 @@ namespace Microsoft.Maui.Graphics
 {
 	public static partial class PaintExtensions
 	{
-		public static Drawable? ToDrawable(this Paint paint, Context? context)
+		public static Drawable? ToDrawable(this Paint? paint, Context? context)
 		{
 			if (paint is SolidPaint solidPaint)
 				return solidPaint.CreateDrawable(context);

src/Core/src/Graphics/PaintExtensions.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using System.Diagnostics.CodeAnalysis;
 
 namespace Microsoft.Maui.Graphics

src/Core/src/Handlers/Entry/EntryHandler.Android.cs

@@ -1,14 +1,9 @@
 using System;
-using Android.Content.Res;
 using Android.Graphics.Drawables;
-using Android.Runtime;
 using Android.Text;
 using Android.Views;
-using Android.Views.InputMethods;
-using Android.Widget;
 using AndroidX.AppCompat.Widget;
 using AndroidX.Core.Content;
-using Microsoft.Maui.Platform;
 using static Android.Views.View;
 using static Android.Widget.TextView;
 
@@ -56,6 +51,7 @@ protected override void ConnectHandler(AppCompatEditText platformView)
 		protected override void DisconnectHandler(AppCompatEditText platformView)
 		{
 			_clearButtonDrawable = null;
+
 			platformView.TextChanged -= OnTextChanged;
 			platformView.FocusChange -= OnFocusedChange;
 			platformView.Touch -= OnTouch;