Extension method ShowSuggestions to AutoCompleteTextView

AutoCompleteTextView+ShowSuggestions.cs

using Android.Widget;

namespace App.Droid.Extensions
{
    /// <summary>
    /// Extension method ShowSuggestions to AutoCompleteTextView
    /// </summary>
    /// <seealso cref="https://stackoverflow.com/questions/2126717/android-autocompletetextview-show-suggestions-when-no-text-entered"/>
    public static class AutoCompleteTextView_ShowSuggestions
    {
        public static void ShowSuggestionsOnInteraction(this AutoCompleteTextView @this)
        {
            @this.ShowSuggestionsOnFocus();
            @this.ShowSuggestionsOnClick();
            @this.ShowSuggestionsOnEmptyText();
        }
        
        /// <summary>
        /// Configure the FocusChange EventHandler to show the drop down suggestions on focus.
        /// </summary>
        /// <param name="this"></param>
        public static void ShowSuggestionsOnFocus(this AutoCompleteTextView @this)
        {
            @this.FocusChange += (sender, args) =>
            {
                if(args.HasFocus)
                    @this.ShowDropDown();
            };
        }
        
        public static void ShowSuggestionsOnClick(this AutoCompleteTextView @this)
            => @this.Click += (sender, args) => @this.ShowDropDown();
        
        public static void ShowSuggestionsOnEmptyText(this AutoCompleteTextView @this)
        {
            @this.TextChanged += async (sender, args) =>
            {
                if (!string.IsNullOrEmpty(@this.Text))
                    return;

                await Task.Delay(TimeSpan.FromMilliseconds(300));
                @this.ShowDropDown();
            };
        }
    }
}