title: Flutter first launch page
body: <p>I'm currently working on a Flutter version of an android application and now want to implement the first launch page. It should only be displayed on the very first launch of the app after it has been installed on a device. I figured out how to do it for the android app, but I only have a basic knowledge of Flutter, so I'm asking this question.
  Does anyone know how to do this in Flutter in a simple way?</p>
  
  <p>Thanks in advance for your help!</p>