missing some letters and number in textview in android 4.3+

Question

I create a view like below image in my monodroid application with code. While every thing is right when I test the app in android 4.1 but when I test it on the android 4.3 and 4.4.2 I faced with below screen. I do not test it on the android 4.2

In the textviews any numbers are not showing. It looks that I typed space. Also about some letters. What is wrong?! What has been changed in the android 4.3 + ?

Answer 1

There is still space for the letters, so perhaps it's an issue with the styling.

Change the style to default, do the letters show up?

Try adding a shadow to the textviews and see if the shadow exists (maybe the letters are somehow transparent, or the same color as the background?)

Answer 2

by referring to @ArieDov comment I post this answer:

Below method that I used caused the problem:

public static void AddShadowEffect (TextView textview)
    {
        try {
            if(RltXmlSettings.Instance.getVal ("shadow_enabled")=="1")
            {
              float[] direction = new float[] {0.3f, -1.0f, 0.0f};
              MaskFilter filter = new EmbossMaskFilter (direction, 0.8f, 15f, 5f);
              textview.Paint.SetMaskFilter (filter);
              textview.Invalidate ();
            }
        } catch (Exception ex) {
            RltLog.HandleException (ex);
        }
    }

the purpose of this method was adding the shadows you see in the question image. and I fixed the problem by changing the style of textviews just like what @Matt said. I used below code for my textviews:

txtlName.SetTypeface (null, TypefaceStyle.Bold);

and this fixed my problem.