why painting on android is different with on windows?

when I draw string (color = black) on android and windows Painting

Painting on android I can not get colors only alpha.there is only alpha in android canvas paint.

but when I scale on windows

you can see the colors I think I can get R or G or B on windows but I can only get alpha on android.

why?

when I draw string on android I create Bitmap Bitmap.CreateBitmap Argb8888