title: I don't want to show SystemUI when I show a alert dialog on the parent fullscreen activity
body: <p>I have a full screen activity, but when I show a alert dialog above it, System UI showed (System Notification Bar). Can anybody help me ? I don't want it to be visible. Is there is any way I can hide the system notification bar from showing when the alert dialog appears?</p>
  
  <p><img src="https://i.stack.imgur.com/sIKuk.jpg" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/tZzJ9.png" alt="enter image description here"></p>