All 7 Flutter Animations Basics questions
More in Flutter Animations Basics
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? 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 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?

Beginner

Answer

An implicit animation, such as using the AnimatedContainer widget, automatically handles smoothly animating a change to one of its properties, such as its width or color, without you needing to manually manage any underlying AnimationController yourself, making it considerably simpler to implement for a straightforward everyday animation need, whereas an explicit animation, built directly using an AnimationController together with an Animation object, gives you significantly more fine grained control over the animation's exact behavior, at the reasonable cost of requiring noticeably more code and a genuinely more careful management of that animation's entire lifecycle.
AnimatedContainer(
  duration: Duration(milliseconds: 300),
  width: isExpanded ? 200 : 100,
  color: isExpanded ? Colors.blue : Colors.grey,
)
Real-world example A settings screen uses a simple AnimatedContainer to smoothly animate a section's width and color whenever a user taps to expand or collapse it, avoiding the need to write and manage a considerably more complex explicit animation just for this genuinely simple use case.

Common follow-ups: When would an implicit animation simply not be sufficiently flexible for a given specific need?;What other implicit animation widgets does Flutter provide besides AnimatedContainer?

Implicit vs Explicit Animations;Custom Widgets & Reusable Components
All 7 Flutter Animations Basics questions