Get method documentation [Android Documentation]

The opacity of the view. This is a value from 0 to 1, where 0 means the view is completely transparent and 1 means the view is completely opaque. By default this is 1.0f.

Set method documentation [Android Documentation]

Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is completely transparent and 1 means the view is completely opaque.

Note that setting alpha to a translucent value (0

For a view with a frequently changing alpha, such as during a fading animation, it is strongly recommended for performance reasons to either override View.HasOverlappingRendering to return false if appropriate, or setting a View.SetLayerType(LayerType, Android.Graphics.Paint) on the view.

If this view overrides View.OnSetAlpha(int) to return true, then this view is responsible for applying the opacity itself.

Note that if the view is backed by a View.SetLayerType(LayerType, Android.Graphics.Paint) and is associated with a View.SetLayerPaint(Android.Graphics.Paint), setting an alpha value less than 1.0 will supercede the alpha of the layer paint.