title: How to get the index of a clicked button inside an item of a listview in Flutter?
body: <p><a href="https://i.stack.imgur.com/ctGnG.jpg" rel="nofollow noreferrer">App screenshot</a>
  Look at the delete icon button on the screenshot. 
  I want to get the index of the clicked button in order to delete the selected item of the listview. What should I do? 
  Thank you for your help! </p>