androidfadingEdgeLength=48dp

This XML attribute sets the length of the fading edge on the left and right sides of a view in Android. The fading edge is a visual effect that gradually fades the content of a view as it approaches the edge of the screen. The value of 48dp sets the length of the fading edge to 48 density-independent pixels. This attribute can be used in any view that extends the View class, such as TextView, ImageView, and LinearLayout.