All 7 Implicit vs Explicit Animations questions
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What are implicit animations in Flutter, and how do widgets such as AnimatedContainer and AnimatedOpacity let you achieve a genuinely smooth animation with genuinely minimal required code? What are explicit animations in Flutter, and why might you genuinely need to use one instead of simply relying entirely on a considerably simpler implicit animation widget? How does the specific curve parameter available on both implicit and explicit animations genuinely let you meaningfully control the actual pacing and overall feel of a given animation, beyond simply relying entirely on a plain, constant linear speed? How do you properly and correctly manage several separate implicit animations together within exactly the same single widget, ensuring each individual one properly and correctly animates completely independently as its own genuinely underlying separate value actually changes? How does the TweenAnimationBuilder widget genuinely let you achieve a considerably more custom implicit animation effect, without actually needing to fully write out an entirely separate fully custom implicit animation widget class completely from scratch yourself? What are the genuine practical performance tradeoffs of using several separate simpler implicit animations compared to using one single, considerably more complex coordinated explicit animation for a genuinely elaborate combined multi part visual effect?
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How can you properly convert a piece of code originally written using an implicit animation over to using an explicit animation instead, once your particular given animation's own requirements have genuinely grown considerably more complex over time?

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Answer

As a given animation's own specific requirements genuinely grow more complex, such as genuinely needing to pause it partway through, precisely coordinate it together with another entirely separate animation, or repeat it a genuinely specific fixed number of times rather than simply continuously forever, converting from an implicit animation over to an explicit one typically involves introducing your own dedicated AnimationController, defining an appropriate corresponding Tween to properly represent your specific animation's own actual value range, and then replacing your original simpler implicit widget with an equivalent AnimatedBuilder or a Tween based transition widget instead, such as replacing AnimatedOpacity with the more explicit, lower level FadeTransition.
// Before: AnimatedOpacity(opacity: value, duration: duration, child: child)
// After: FadeTransition(opacity: controller, child: child)
Real-world example A developer originally using AnimatedOpacity for a simple fade effect later genuinely needs to pause that specific animation partway through in direct response to a particular user action, and properly converts their existing code over to use an explicit AnimationController together with FadeTransition instead to genuinely gain that specific required additional level of manual control.

Common follow-ups: At what specific point does it genuinely become worth the additional required complexity of actually switching over to an explicit animation approach?;What is the specific corresponding explicit equivalent widget genuinely available for each of Flutter's own common implicit animation widgets?

Flutter Animations Basics;Flutter Widget Tree Element Tree & BuildContext
All 7 Implicit vs Explicit Animations questions