title: How to call getWindow() outside an Activity in Android?
body: <p>I am trying to organize my code and move repetitive functions to a single class.
  This line of code works fine inside a class that extends activity:</p>
  
  <pre><code>getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
  </code></pre>
  
  <p>However it is not working when I try to include it into an external class.</p>
  
  <p>How do I call getWindow() from another class to apply it inside an Activity?</p>