title: Screen never off but saving battery
body: <p>I use this code for have the screen always on</p>
  
  <pre><code>getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  </code></pre>
  
  <p>I'd like to know there is the option that device set the low light if the user is inactive (saving battery).</p>