title: Change Android spinner text color when button pressed
body: <p>I have a series of ToggleButtons which represent a series of topics. When toggled, the ToggleButton changes its background color to indicate its state. When in the <code>checked</code> state, the ToggleButton has a darker color.</p>
  
  <p><img src="https://i.stack.imgur.com/0nqKz.png" alt="Selected state.">
  <img src="https://i.stack.imgur.com/WrYT3.png" alt="enter image description here"></p>
  
  <p>A Spinner overlays the ToggleButton and allows the user to select a difficulty for the topic.</p>
  
  <p>How do I change the text color (to white) of the Spinner when the ToggleButton is pressed? I think I can handle changing the spinner selector, but I'm struggling to work out a way to change the text color.</p>