All 7 Flutter Animations Basics questions
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What is an AnimationController in Flutter, and how does it act as the central driver that actually controls the progress and timing of an animation? What is the difference between implicit and explicit animations in Flutter, and which specific approach is generally simpler to actually implement for a straightforward, everyday animation need? How does the AnimatedBuilder widget let you efficiently rebuild only the specific part of your widget tree that actually needs to change on every single animation frame, rather than rebuilding an entire larger, unrelated widget subtree unnecessarily? What are animation curves in Flutter, such as Curves.easeIn or Curves.bounceOut, and how do they let you control the specific pacing and feel of an animation rather than it always simply moving at a perfectly constant, linear speed? How can you properly coordinate several separate, related animations together, such as a fade combined with a scale effect, ensuring they all play in perfect sync using a single shared underlying AnimationController? What performance considerations become important when building a screen containing several simultaneous, continuously running animations, and how can Flutter DevTools help identify a genuine animation related performance problem?
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How does a Tween work together with an AnimationController to actually define the specific range of values, such as a color or a position, that an animation should smoothly transition between?

Intermediate

Answer

A Tween, short for in between, defines the specific starting and ending values that an animation should smoothly interpolate between as the underlying AnimationController's progress value moves from zero to one, and calling the Tween's animate method, passing in the AnimationController, produces an Animation object that continuously computes and provides the correctly interpolated current value at any given point during that animation's overall progress, letting you animate not just simple numeric values but also more complex types like Color or Offset, provided a suitable specialized Tween subclass exists for that specific type.
final colorAnimation = ColorTween(begin: Colors.blue, end: Colors.red)
  .animate(controller);
Real-world example A button press feedback animation smoothly transitions its background color from blue to red using a ColorTween driven by an AnimationController, providing clear, satisfying visual feedback that a specific action has genuinely been registered.

Common follow-ups: What is the difference between a regular Tween and a specialized ColorTween or a CurveTween?;Can a single AnimationController drive several separate different Tween animations all at the same time?

Implicit vs Explicit Animations;Custom Painters & CustomPaint
All 7 Flutter Animations Basics questions