public double MeasureTextSize(string text, double width, double fontSize, string fontName = null)
{
var textView = new TextView(global::Android.App.Application.Context);
textView.Typeface = GetTypeface(fontName);
textView.SetText(text, TextView.BufferType.Normal);
textView.SetTextSize(ComplexUnitType.Px, (float)fontSize);
int widthMeasureSpec = AViews.View.MeasureSpec.MakeMeasureSpec(
(int)width, AViews.MeasureSpecMode.AtMost);
int heightMeasureSpec = AViews.View.MeasureSpec.MakeMeasureSpec(
0, AViews.MeasureSpecMode.Unspecified);
textView.Measure(widthMeasureSpec, heightMeasureSpec);
return (double)textView.MeasuredHeight;
}