title: Setting a color based on theme
body: <p>I have an accent color that I use through out my layouts.  I have it defined as a style that I apply to a TextView.</p>
  
  <p>My application lets the user choose between a dark theme and a light theme. I would like to tweak the accent color based on the selected theme.  </p>
  
  <ul>
  <li>You can't define a color in a theme </li>
  <li>You can't define a state list color based on theme  </li>
  <li>You can't separate resources based on theme (as you can for version or screen size)   </li>
  <li>You can't update the resource color from code (??? not 100% on this ???)</li>
  </ul>
  
  <p>How should I control my accent color based on the selected theme?  </p>
  
  <p>The dev guide gives an example of a theme using a custom color, which is close to what I want.  I need to be able to change the color at runtime.  I know I could go into my code and the X places where this style is being used I could ferrit out the component and set the color that way.  But I would think I could accomplish this with some combination of style/theme.</p>
  
  <p>Thanks </p>