android - Changing CardView shadow color

Question

This question was asked on SO many times, but still I didn't find a good solution for this problem.

Why do I need this to do? Well because project me and my team develops has iOS style.

What did I try?

1. 9.pathch shadow generator but 9.pathes are essentially pngs and it gives me no flexibility and if I'll use this approach I should edit margins everywhere.
2. Carbon library it supports custom shadows and they get drawn outside of view borders, but there is issue regarding rounded rectangles, when library doesn't draw shadow for rounded corners.
3. using old CardView implementation and overriding its shadow color, but it gets drawn inside of card bounds, so it isn't option.

So is there a way to change shadow color of CardView with minimum edits of all layout files and with drawing shadow outside of the view like original CardView does?

question from:https://stackoverflow.com/questions/51001921/changing-cardview-shadow-color

Answer 1

Consider this thread in twitter, where Nick Butcher talks about how to implement the feature:

See outlineAmbientShadowColor, outlineSpotShadowColor, spotShadowAlpha and ambientShadowAlpha attributes for details. Unfortunately, that's possible from API 28 onwards.

For lower APIs Nick has shared a gist. Here's the result:

^{Running on API 21}

This technique isn't directly connected to CardView, it can be applied to any View.