How do you implement a custom animation that transitions between multiple states in Flutter?

To implement a custom animation transitioning between states, you can use the AnimatedBuilder widget. This widget allows you to define a callback function that builds the animated widget tree based on the current animation value. The AnimationController is used to control the animation, and the Tween class helps define the range of values for the animation. Understanding the workflow involving these components is crucial for creating complex and custom animations in Flutter.