# Animations (Flutter)

> AnimationController, Tween, Curves, AnimatedBuilder, implicit animations, Hero

- 20 interview questions
- Mid-Level
- [Interview Questions: Flutter](https://sharpskill.dev/en/technologies/flutter/interview-questions.md)

## 1. What is an AnimationController in Flutter?

**Answer**

An AnimationController is the core object that controls an animation in Flutter. It generates values between 0.0 and 1.0 over a specified duration, allows starting, stopping, reversing or repeating the animation. It requires a TickerProvider (via SingleTickerProviderStateMixin or TickerProviderStateMixin) to synchronize frames.

## 2. Why use SingleTickerProviderStateMixin in a State that contains an AnimationController?

**Answer**

SingleTickerProviderStateMixin provides a single Ticker to the State, required for an AnimationController to synchronize its frames with the rendering engine. The Ticker emits a signal at each frame (60 times per second) to update the animation value. Using this mixin optimizes resources when only one controller is needed.

## 3. What is the difference between SingleTickerProviderStateMixin and TickerProviderStateMixin?

**Answer**

SingleTickerProviderStateMixin is optimized for a single AnimationController and uses fewer resources. TickerProviderStateMixin allows creating multiple Tickers to manage several AnimationControllers in the same State. Use SingleTickerProviderStateMixin when one controller suffices, otherwise opt for TickerProviderStateMixin.

## 17 more questions available

- What is a Tween in Flutter and what is it used for?
- How to apply an acceleration curve (Curve) to a Flutter animation?

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