All 7 Flutter Animations Basics questions
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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 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? 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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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?

Beginner

Answer

An AnimationController is the core object responsible for actually driving an animation forward, managing its current progress value, typically ranging between zero and one, over a specified duration, and controlling whether it is currently playing forward, playing in reverse, or repeating, and most other Flutter animation related widgets and classes are ultimately built on top of and driven by an underlying AnimationController, making it a genuinely foundational building block for understanding how animation actually works throughout the entire Flutter framework.
final controller = AnimationController(
  duration: Duration(milliseconds: 500),
  vsync: this,
);
controller.forward();
Real-world example A custom loading indicator creates an AnimationController with a five hundred millisecond duration, calling forward to begin smoothly animating its visual progress value from zero up to one over that exact specified duration.

Common follow-ups: What does the vsync parameter actually do, and why is it a required parameter for an AnimationController?;How do you properly dispose of an AnimationController to avoid a memory leak?

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