Flutter Lottie Animations Demo

This Flutter project demonstrates the integration and usage of Lottie animations to enhance user interface and user experience. It showcases two main use cases: a loading animation and an interactive like button with a dynamic animation change.

Features

• Loading Animation: A looping Lottie animation displayed while content is loading.
• Interactive Like Button: A button with a Lottie animation that plays once when clicked, providing visual feedback to the user.
• Dynamic Animation Change: The central loading animation changes to a "Thank You" animation upon liking, providing engaging feedback.
• Clean and Modern UI: The UI is designed with a clean, modern aesthetic using Material Design components and consistent styling.
• Robust Animation Handling: Includes proper handling of animation loading and controller management to prevent errors.

Screenshots

Example:

Loading State

Liked State

Like Animation

Getting Started

To run this project:

1. Clone the repository:

   git clone https://github.com/sayed3li97/flutter_lottie_demo.git

2. Navigate to the project directory:

   cd flutter_lottie_demo

3. Install dependencies:

   flutter pub get

4. Add Lottie Animations:

   • Download Lottie JSON files for loading, like, and thanks animations (e.g., from LottieFiles).
   • Create an assets/animations directory in your project.
   • Place the JSON files in the assets/animations directory.
   • Update your pubspec.yaml file:

   flutter:
     assets:
       - assets/animations/
       - assets/animations/loading.json
       - assets/animations/like.json
       - assets/animations/thanks.json

5. Run the app:

   flutter run

Code Highlights

• Conditional Animation Rendering: The central animation is dynamically switched between loading and thanks animations based on the like state.

  isLiked
      ? Lottie.asset('assets/animations/thanks.json')
      : Lottie.asset('assets/animations/loading.json'),

• One-Time Like Animation: The like animation plays only once per click using _likeController.forward().whenComplete(() => _likeController.reset());.

• Proper Animation Controller Management: The onLoaded callback is used to ensure the animation duration is set correctly, preventing errors.

  Lottie.asset(
      // ...
      onLoaded: (composition) {
        setState(() {
          _lottieLoaded = true;
          _likeController.duration = composition.duration;
        });
      },
  );

Dependencies

• lottie: ^3.3.0 (or latest)

Contributing

Contributions are welcome! Please open an issue or submit a pull request.

Author

Sayed Ali Alkamel/GitHub Profile

License

MIT License

Copyright (c) [2025] [Sayed Ali Alkamel]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.