title: How to get checkbox preference value?
body: <p>I have checkbox in preferences. I want to keep screen on if checkbox is checked and not to keep screen on if checkbox is not checked.</p>
  
  <p>I want something like this:</p>
  
  <pre><code>boolean keepScreen = sharedPrefs.getBoolean("chck_screen", false);
  
  if (keepScreen.equals(false)) {
      getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
  
  }
  </code></pre>
  
  <p>Please, help.</p>