How to get primary or accent color of currently applied theme in angular material 2

I'm building an app with multiple theme with angular material design 2. I created multiple theme and it's working really great. Using this guideline : Angular Material design theme

But the problem is that if user select "green theme" for example. Then I want to display his/her name in green and so. But how can I get the currently selected theme in this case "green" in my component style and then use that primary variable in my user name class to change its color

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