title: Make the app content blank in the "recent apps" list
body: <p>When the app is shown in the recents menu, I need to make the content blank, so that screenshots can not be taken.
  This flag works</p>
  <pre><code> getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
  </code></pre>
  <p>and the screen becomes empty white. I need to handle the scenario where the user has selected the dark mode, and so the screen must be empty dark.</p>
  <p>What other options can I have other than using this flag?</p>