How can I make alertDialog disappear automatically after few seconds in Flutter?

Question

An alertDialog is to be shown when a button is tapped and disappear automatically after few seconds. How can I do that in Flutter?

Answer 1

A Minimal E.g:

It Closes the alertDialog after 5 seconds.

           showDialog(                       context: context,                       builder: (context) {                         Future.delayed(Duration(seconds: 5), () {                           Navigator.of(context).pop(true);                         });                         return AlertDialog(                           title: Text('Title'),                         );                       }); 

Answer 2

Future.delayed can cause some problems if you dismiss the dialog before the Future is triggered. So, if you use it be careful that the showDialog is not dismissable barrierDismissible: false and that the AlertDialog hasn't buttons that dismiss it.

Otherwise, you can use a Timer:

Timer timer = Timer(Duration(milliseconds: 3000), (){   Navigator.of(context, rootNavigator: true).pop(); }); showDialog(   ... Dialog Code ... ).then((value){   // dispose the timer in case something else has triggered the dismiss.   timer?.cancel();   timer = null; });