title: Flutter. How to have constant/permanent notification running?
body: <p>I would love to know if it is possible to have this kind of notification using flutter. These image I made on my phone from the app "A HIIT Interval Timer". <a href="https://i.stack.imgur.com/GsrBF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GsrBF.jpg" alt="enter image description here"></a><a href="https://i.stack.imgur.com/Wa9rN.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Wa9rN.jpg" alt="enter image description here"></a></p>
  
  <p>There is an Icon when it is resized but when you put down the notification bar it shows you the remaining time left. I would like to make a very similiar thing for my app that includes a timer. What is the correct name for this kind of notification? Where should I start looking for making this? thanks</p>