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Flutter Use Animation And Animation Controller | Curved Animation In Flutter.
Well-designed animations make a UI feel more intuitive, contribute to the slick look and feel of a polished app, and improve the user experience. Flutter’s animation support makes it easy to implement a variety of animation types. Many widgets, especially Material widgets, come with the standard motion effects defined in their design spec, but it’s also possible to customize these effects.

A controller for animation.

This class lets you perform tasks such as:

Play an animation forward or in reverse, or stop an animation.
Set the animation to a specific value.
Define the upperBound and lowerBound values of an animation.
Create a fling animation effect using a physics simulation.
By default, an AnimationController linearly produces values that range from 0.0 to 1.0, during a given duration. The animation controller generates a new value whenever the device running your app is ready to display a new frame (typically, this rate is around 60 values per second).

Ticker providers
An AnimationController needs a TickerProvider, which is configured using the vsync argument on the constructor.

The TickerProvider interface describes a factory for Ticker objects. A Ticker is an object that knows how to register itself with the SchedulerBinding and fires a callback every frame. The AnimationController class uses a Ticker to step through the animation that it controls.

If an AnimationController is being created from a State, then the State can use the TickerProviderStateMixin and SingleTickerProviderStateMixin classes to implement the TickerProvider interface. The TickerProviderStateMixin class always works for this purpose; the SingleTickerProviderStateMixin is slightly more efficient in the case of the class only ever needing one Ticker (e.g. if the class creates only a single AnimationController during its entire lifetime).

The widget test framework WidgetTester object can be used as a ticker provider in the context of tests. In other contexts, you will have to either pass a TickerProvider from a higher level (e.g. indirectly from a State that mixes in TickerProviderStateMixin), or create a custom TickerProvider subclass.

flutter animation:
https://flutter.dev/docs/development/...

animationController :
https://api.flutter.dev/flutter/anima...