Flutter Tooltip

Tooltips provide text labels that helps to explain the function of a button or other user interface action. Tooltip is a string. When you user clicks and holds on a button, you will see that message.

Inside any button there will be a property named as tooltip, checkout below code:

new IconButton(
                    icon: new Icon(Icons.timer),
                    onPressed: _onPressed,
                    tooltip: "Click me",
                ),