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public class MyButton : View, IMyButton
{
 
}

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public interface IMyButton : IView
{
    public string Text { get; }
    public Color TextColor { get; }
    void Completed();
}

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#if __ANDROID__
  ViewHandler.ViewMapper[nameof(IView.BackgroundColor)] = (handler, view) =>
  (handler.NativeView as AView).SetBackgroundColor(Android.Graphics.Color.Green);

  var textView = crossPlatformLabel.Handler.NativeView as TextView;
 
#endif

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<application android:label="MVP" 
  android:icon="@mipmap/ic_launcher" 
  android:roundIcon="@mipmap/ic_launcher_round">
  ...
</application>

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<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@color/ic_launcher_background"/>
    <foreground android:drawable="@mipmap/mvp_logo"/>
</adaptive-icon> 

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[assembly: ExportRenderer(typeof(DatePicker), typeof(MyDatePickerRenderer))]
namespace MyProject.iOS.Renderers
{
    public class MyDatePickerRenderer : DatePickerRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<DatePicker> e)
        {
            base.OnElementChanged(e);

            if (e.NewElement != null && Control != null)

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using Android.Content;
using Android.Graphics;
using Android.Widget;
using Google.Android.Material.BottomNavigation;
using Google.Android.Material.Internal;
using MyProject.Droid.Renderers;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
using Xamarin.Forms.Platform.Android.AppCompat;

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<?xml version="1.0" encoding="UTF-8" ?>
<resources xmlns:tools="http://schemas.android.com/tools">
  <dimen name="design_bottom_navigation_text_size" tools:override="true">14sp</dimen>
  <dimen name="design_bottom_navigation_active_text_size" tools:override="true">14sp</dimen>
  <dimen name="design_bottom_navigation_icon_size">20dp</dimen>
  <dimen name="design_bottom_navigation_height">60dp</dimen>
</resources>

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public App()
{
  InitializeComponent();
  
  // Set the theme that the user has picked.
  Current.UserAppTheme = (OSAppTheme)Preferences.Get(Settings.AppTheme, Settings.AppThemeDefault);
}

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public class ThemePickerViewModel
{
  public IList<AppThemeViewModel> AppThemes { get; set; } = new List<AppThemeViewModel> {
    new AppThemeViewModel() { Key = (int)OSAppTheme.Unspecified },
    new AppThemeViewModel() { Key = (int)OSAppTheme.Light },
    new AppThemeViewModel() { Key = (int)OSAppTheme.Dark }
  };

  public ICommand SetAppThemeCommand { get; set; }