Android : Change text color in style theme by code

Hello myself swati agrawal

my question is: How can i change the textcolor of all textview by changing the textcolor of theme (which is mention in style) programmatically??

Explain: Suppose I want to change the setting in my android application

I have a spinner , and I fill it with different color name. Then how can i change the textcolor of all textview by selected item of spinner.

my default theme is:

<item name="android:textColor">#3DAAB9</item>
<item name="android:textSize">20dp</item>
<item name="android:textStyle">bold</item>

I don't understand How can I do ?