How to draw a customized shadow under the line on canvas in Android

Question

I have a android app, and I try to draw some shadow under the line on canvas. How can I manage to do that.

I've draw some line with MPAndroidChart , and setShadowLayer to renderPaint, so what I got is: All point in shadow share the same offset to the red line.

But what I want is : All shadow point lies under the gradient color line.

How can I achieve that, any prompt or work around? Thanks.

Answer 1

After some research, I figure out that android did not support drawing shadow that like the second picture.

And, my bad, I can simply draw another blank line to be the shadow.