android:fadingEdgeLength

added in API Level 1

Defines the length of the fading edges. Must be a dimension value.

(Doesn't seem to do anything with a TextView or EditText, by itself)

android:fadingEdgeLength = "5dp"

Resources:

http://developer.android.com/reference/android/widget/TextView.html#attr_android:textSize
http://developer.android.com/reference/android/R.attr.html#textSize