Defining a Pulse/Resize Animation in Flutter

pulse_animation_controller.dart

AnimationController _controller;
Animation<Size> _myAnimation;

@override
void initState() {
  // TODO: implement initState
  super.initState();
  _controller = AnimationController(
    vsync: this,
    duration: Duration(milliseconds: 1000),

  );
  _myAnimation = Tween<Size>(
      begin: Size(100, 100),
      end:  Size(120, 120)
  ).animate(
      CurvedAnimation(parent: _controller, curve: Curves.bounceIn)
  );

  _controller.addStatusListener((AnimationStatus status) {
    if (status == AnimationStatus.completed) {
      _controller.repeat();
    }
  });
}