PM-3349 PM-3350 MAUI Migration Initial

src/App/Platforms/Android/Handlers/DatePickerHandlerMappings.cs

@@ -0,0 +1,39 @@
+using Android.Views;
+using Bit.App.Controls;
+using Microsoft.Maui.Handlers;
+
+namespace Bit.App.Handlers
+{
+    public class DatePickerHandlerMappings
+    {
+        public static void Setup()
+        {
+            DatePickerHandler.Mapper.AppendToMapping("CustomDatePickerHandler", (handler, datePicker) =>
+            {
+                if (datePicker is ExtendedDatePicker extDatePicker)
+                {
+                    // center text
+                    handler.PlatformView.Gravity = GravityFlags.CenterHorizontal;
+
+                    // use placeholder until NullableDate set 
+                    if (!extDatePicker.NullableDate.HasValue)
+                    {
+                        handler.PlatformView.Text = extDatePicker.PlaceHolder;
+                    }
+                }
+            });
+
+            DatePickerHandler.Mapper.AppendToMapping(nameof(IDatePicker.Date), UpdateTextPlaceholderOnFormatLikePlacholder);
+
+            DatePickerHandler.Mapper.AppendToMapping(nameof(IDatePicker.Format), UpdateTextPlaceholderOnFormatLikePlacholder);
+        }
+
+        private static void UpdateTextPlaceholderOnFormatLikePlacholder(IDatePickerHandler handler, IDatePicker datePicker)
+        {
+            if (datePicker is ExtendedDatePicker extDatePicker && extDatePicker.Format == extDatePicker.PlaceHolder)
+            {
+                handler.PlatformView.Text = extDatePicker.PlaceHolder;
+            }
+        }
+    }
+}