Book Image

UI Animations with Lottie and After Effects

By : Mireia Alegre Ruiz, Emilio Rodriguez Martinez
Book Image

UI Animations with Lottie and After Effects

By: Mireia Alegre Ruiz, Emilio Rodriguez Martinez

Overview of this book

Lottie is a small and scalable JSON-based animation file. LottieFiles is the platform where Lottie animations can be uploaded, tested, and shared. By combining the LottieFiles plugin and the LottieFiles platform, you’ll be able to create stunning animations that are easy to integrate in any device. You’ll also see how to use the Bodymovin plugin in After Effects to export your animation to a JSON file. The book starts by giving you an overview of Lottie and LottieFiles. As you keep reading, you’ll understand the entire Lottie ecosystem and get hands-on with classic 2D animation principles. You’ll also get a step-by-step guided tour to ideate, sketch for storytelling, design an icon that will fulfill the needs and expectations of users based on UX, and finally animate it in Adobe After Effects. This will help you get familiar with the After Effects environment, work with vector shape layers, create and modify keyframes using layer properties, explore path and mask features, and adjust timing easily to create professional-looking animations. By the end of this animation book, you’ll be able to create and export your own Lottie animations using After Effects and implement them in mobile apps using React Native. You’ll also have an understanding of 2D animation best practices and principles that you can apply in your own projects.
Table of Contents (16 chapters)
1
Part 1 - Building a Foundation With After Effects and LottieFiles
5
Part 2 - Cracking Lottie Animations
9
Part 3 - Adding Your Lottie Animations Into Mobile Apps

20. An error shows on my app – Execution failed for task ':lottie-react-native:compileDebugJavaWithJavac'

This error may arise after updating to a newer version of React Native and running the app on an Android device for the first time. Sometimes, just cleaning the builds folder fixes this problem, but there are two other approaches that may fix it if cleaning didn't do the trick:

  • Migrate your app to AndroidX by adding android.useAndroidX=true and android.enableJetifier=true to your gradle.properties file and running npx jetifier immediately afterward. This prepares your app to include the AndroidX-based libraries.
  • Make sure you are using JDK v8 instead of a newer version (Android Studio may install newer versions). You can follow the environment setup instructions on the React Native website (https://reactnative.dev/docs/environment-setup) and configure that version of Java as your default one in your shell configuration file.