How to run code after some delay in Flutter?

Question

I\'d like to execute a function after a certain delay after my Widget is built. What\'s the idiomatic way of doing this in Flutter?

What I\'m trying to achieve: I\'

Answer 1

Future.delayed(Duration(seconds: 3) , your_function)

Answer 2

You can use Future.delayed to run your code after some time. e.g.:

Future.delayed(const Duration(milliseconds: 500), () {

// Here you can write your code

  setState(() {
    // Here you can write your code for open new view
  });

});

In setState function, you can write a code which is related to app UI e.g. refresh screen data, change label text, etc.

Answer 3

Just adding more description over the above answers

The Timer functionality works with below duration time also:

const Duration(
      {int days = 0,
      int hours = 0,
      int minutes = 0,
      int seconds = 0,
      int milliseconds = 0,
      int microseconds = 0})

Example:

  Timer(Duration(seconds: 3), () {
    print("print after every 3 seconds");
  });

Answer 4

You can do it in two ways 1 is Future.delayed and 2 is Timer

Using Timer

Timer is a class that represents a count-down timer that is configured to trigger an action once end of time is reached, and it can fire once or repeatedly.

Make sure to import dart:async package to start of program to use Timer

Timer(Duration(seconds: 5), () {
  print(" This line is execute after 5 seconds");
});

Using Future.delayed

Future.delayed is creates a future that runs its computation after a delay.

Make sure to import "dart:async"; package to start of program to use Future.delayed

Future.delayed(Duration(seconds: 5), () {
   print(" This line is execute after 5 seconds");
});