PaintUtils.cs

    public class PaintUtils : Pos.PaintUtils.ICalculateTextWidth
    {
        public double CalculateWidth(string text)
        {
            Rect bounds = new Rect();
            var textView = new TextView(Forms.Context);
            textView.Paint.GetTextBounds(text, 0, text.Length, bounds);
            var length = bounds.Width();
            return length / Res.Resources.System.DisplayMetrics.ScaledDensity;
        }
    }