FLUTTER Development - Animation - Custom Animation

Why do you want to customize an animation?

When the animation provided by the system does not meet business needs, we need our own custom animation.
Enhance the ability of custom components through custom animations

Two custom animation process

Inherit the StateFulWidget to complete the drawing of the animation interface
setState Mid-action execution and status monitoring and refresh UI
disposeRelease resource

Three samples

3.1 code

// Entrance location
Future<void> main() async {
  runApp(Home());
}
class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(body: Center(child: AnimationDemo(),),),
    );
  }
}
 // Custom animation
class AnimationDemo extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => _AnimationDemo();
}

class _AnimationDemo extends State<AnimationDemo> with SingleTickerProviderStateMixin {
  AnimationController _animationController;
  Animation _animation;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(duration: Duration(seconds: 2), vsync: this);
    _animation = Tween(begin: .5, end: .1).animate(_animationController);
         _AnimationController.forward (); // Start animation
  }

  @override
  Widget build(BuildContext context) {
    return  ScaleTransition(
      scale: _animation,
      child: Container(height: 200, width: 200, color: Colors.red,),
    );
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }
}

3.2 renderings

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