Custom view puzzle getcolor r.color The color obtained by colorprimary is incorrect

In the custom View When , You can get... Through the following code colorPrimary The color of the . But the obtained color seems to be different .

 mPrimaryColor=ContextCompat.getColor(getContext(),R.color.colorPrimary);

For example, below ：

This is a custom circular progress bar , The color of the bottom ring and ToolBar The color looks different to the naked eye . But the colors I set are colorPrimary, And I haven't customized this color .
in fact , The color of these two places is the same , It looks different just because of illusion .
It looks different just because of illusion ！！！
It looks different just because of illusion ！！！

If you use a color picker to get the colors of these two places , You will find that the color is the same ！！！ The angle you see , Color next to color , Will give the human eye an illusion .