Custom versions of Button, EditText, and TextView for Xamarin.Android that support custom fonts

attrs.xml

<resources>
    <declare-styleable name="Fonts">
        <attr name="android:textStyle" />
        <attr name="customFont" format="string"/>
    </declare-styleable>
</resources>

CustomButton.cs

using System;
using Android.Content;
using Android.Graphics;
using Android.Util;
using Android.Widget;

namespace MyProject.Droid.Controls
{
    public class CustomButton : Button
    {
        public CustomButton(Context context)
            : this(context, null)
        {
        }

        public CustomButton(Context context, IAttributeSet attributes)
            : this(context, attributes, Resource.Attribute.titleTextStyle)
        {
        }

        public CustomButton(Context context, IAttributeSet attributes, int defStyle)
            : base(context, attributes, defStyle)
        {
            var a = context.ObtainStyledAttributes(attributes, Resource.Styleable.Fonts);
            var font = a.GetString(Resource.Styleable.Fonts_customFont);

            this.SetCustomFont(font);

            a.Recycle();
        }

        public void SetCustomFont(string asset)
        {
            Typeface typeface = null;
            try
            {
                typeface = Typeface.CreateFromAsset(Context.Assets, asset);

                if (typeface == null)
                {
                    Console.WriteLine("No typeface found for asset: " + asset);
                    return;
                }
            }
            catch
            {
                Console.WriteLine("Could not load typeface from asset: " + asset);
                return;
            }

            var style = typeface?.Style ?? TypefaceStyle.Normal;

            this.SetTypeface(typeface, style);
        }
    }
}

CustomEditText.cs

using System;
using Android.Content;
using Android.Graphics;
using Android.Util;
using Android.Widget;

namespace MyProject.Droid.Controls
{
    public class CustomEditText : EditText
    {
        public CustomEditText(Context context)
            : this(context, null)
        {
        }

        public CustomEditText(Context context, IAttributeSet attributes)
            : this(context, attributes, Resource.Attribute.titleTextStyle)
        {
        }

        public CustomEditText(Context context, IAttributeSet attributes, int defStyle)
            : base(context, attributes, defStyle)
        {
            var a = context.ObtainStyledAttributes(attributes, Resource.Styleable.Fonts);
            var font = a.GetString(Resource.Styleable.Fonts_customFont);

            this.SetBackgroundColorFilter(context);
            this.SetCustomFont(font);

            a.Recycle();
        }

        private void SetBackgroundColorFilter(Context context)
        {
            //this.Background.SetColorFilter(context.Resources.GetColor(Resource.Color.appBorderColor), PorterDuff.Mode.SrcAtop);
        }

        public void SetCustomFont(string asset)
        {
            Typeface typeface = null;
            try
            {
                typeface = Typeface.CreateFromAsset(Context.Assets, asset);

                if (typeface == null)
                {
                    Console.WriteLine("No typeface found for asset: " + asset);
                    return;
                }
            }
            catch
            {
                Console.WriteLine("Could not load typeface from asset: " + asset);
                return;
            }

            var style = typeface?.Style ?? TypefaceStyle.Normal;

            this.SetTypeface(typeface, style);
        }
    }
}

CustomTextView.cs

using System;
using Android.Content;
using Android.Graphics;
using Android.Util;
using Android.Widget;

namespace MyProject.Droid.Controls
{
    public class CustomTextView : TextView
    {
        public CustomTextView(Context context)
            : this(context, null)
        {
        }

        public CustomTextView(Context context, IAttributeSet attributes)
            : this(context, attributes, Resource.Attribute.titleTextStyle)
        {
        }

        public CustomTextView(Context context, IAttributeSet attributes, int defStyle)
            : base(context, attributes, defStyle)
        {
            var a = context.ObtainStyledAttributes(attributes, Resource.Styleable.Fonts);
            var font = a.GetString(Resource.Styleable.Fonts_customFont);

            this.SetCustomFont(font);

            a.Recycle();
        }

        public void SetCustomFont(string asset)
        {
            Typeface typeface = null;
            try
            {
                typeface = Typeface.CreateFromAsset(Context.Assets, asset);

                if (typeface == null)
                {
                    Console.WriteLine("No typeface found for asset: " + asset);
                    return;
                }
            }
            catch
            {
                Console.WriteLine("Could not load typeface from asset: " + asset);
                return;
            }

            var style = typeface?.Style ?? TypefaceStyle.Normal;

            this.SetTypeface(typeface, style);
        }
    }
}

layout.axml

<MyProject.Droid.Controls.CustomButton
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  customFont="Fonts/Font.otf" 
  android:text="Click Me!" />

<MyProject.Droid.Controls.CustomEditText
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  customFont="Fonts/Font.otf" 
  android:text="Click Me!" />

<MyProject.Droid.Controls.CustomTextView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  customFont="Fonts/Font.otf" 
  android:text="Click Me!" />