PM-3349 Fix Picker selection style by doing a custom PickerHandler for Android which uses SetSingleChoiceItems(...) to provide with the appropriate UI

src/Core/Controls/Picker/PickerHandler.cs

@@ -0,0 +1,53 @@
+#if ANDROID
+using Microsoft.Maui.Handlers;
+using Microsoft.Maui.Platform;
+
+namespace Bit.Core.Controls.Picker
+{
+    // HACK: Due to https://github.com/dotnet/maui/issues/19681 and not willing to use reflection to access
+    // the alert dialog, we need to redefine the PickerHandler implementation for a custom one of ours
+    // which handles showing the current selected item. Remove this workaround when MAUI releases a fix for this.
+    // This is a copy from https://github.com/dotnet/maui/blob/main/src/Core/src/Handlers/Picker/PickerHandler.cs
+    public partial class PickerHandler : ViewHandler<IPicker, MauiPicker>, IPickerHandler
+    {
+        public static IPropertyMapper<IPicker, IPickerHandler> Mapper = new PropertyMapper<IPicker, PickerHandler>(ViewMapper)
+        {
+#if __ANDROID__ || WINDOWS
+            [nameof(IPicker.Background)] = MapBackground,
+#endif
+            [nameof(IPicker.CharacterSpacing)] = MapCharacterSpacing,
+            [nameof(IPicker.Font)] = MapFont,
+            [nameof(IPicker.SelectedIndex)] = MapSelectedIndex,
+            [nameof(IPicker.TextColor)] = MapTextColor,
+            [nameof(IPicker.Title)] = MapTitle,
+            [nameof(IPicker.TitleColor)] = MapTitleColor,
+            [nameof(ITextAlignment.HorizontalTextAlignment)] = MapHorizontalTextAlignment,
+            [nameof(ITextAlignment.VerticalTextAlignment)] = MapVerticalTextAlignment,
+            [nameof(IPicker.Items)] = MapItems,
+        };
+
+        public static CommandMapper<IPicker, IPickerHandler> CommandMapper = new(ViewCommandMapper)
+        {
+        };
+
+        public PickerHandler() : base(Mapper, CommandMapper)
+        {
+        }
+
+        public PickerHandler(IPropertyMapper? mapper)
+            : base(mapper ?? Mapper, CommandMapper)
+        {
+        }
+
+        public PickerHandler(IPropertyMapper? mapper, CommandMapper? commandMapper)
+            : base(mapper ?? Mapper, commandMapper ?? CommandMapper)
+        {
+        }
+
+        IPicker IPickerHandler.VirtualView => VirtualView;
+
+        Microsoft.Maui.Platform.MauiPicker IPickerHandler.PlatformView => PlatformView;
+    }
+}
+
+#endif