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Learn how to fetch and apply animation duration directly from Lottie JSON files in your Android applications, improving efficiency in Splash Screen implementations.
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How to Dynamically Set Animation Duration in Android Using Lottie JSON

In Android development, a common requirement is to control the timing of splash screens and other animations. If you are using Lottie for animations, you may find yourself initially setting delays as constants. This approach can lead to inefficiencies, especially if you have different animations with varying lengths. In this guide, we will tackle the challenge of retrieving the animation duration directly from a Lottie JSON file, streamlining your application’s performance and improving the user experience.

The Problem

Many developers often face the issue of hardcoding animation delays in their apps. For example, here’s a snippet where a constant duration is utilized:

[[See Video to Reveal this Text or Code Snippet]]

While functional, this code does not utilize the actual duration of the Lottie animation, leading to a lack of flexibility. Instead of a fixed delay, we want to dynamically derive the animation duration from the Lottie JSON itself.

The Solution

To resolve this, we will extract the duration from the Lottie composition and replace the hardcoded delay. Below is the step-by-step breakdown of how to achieve this.

Step 1: Modify the Composable Function

First, we need to redefine our composable function to pull the duration from compositionResult. Here’s the refactored code implementation:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Utilize Lottie’s Properties

In the modified code above, note how compositionResult.value?.duration is used. Here’s an explanation of its crucial parts:

compositionResult.value?.duration: This retrieves the duration of the Lottie animation from the JSON data, providing flexibility based on the animation length.

?: SPLASH_SCREEN_DURATION: This acts as a fallback in case the duration value is null or not obtainable. This assures that your app remains functional even if the duration isn't provided in the JSON.

Step 3: Implement the Animation

In the composable function for the animation, ensure you are correctly displaying the Lottie animation as shown below:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By extracting the animation duration from the Lottie JSON, we can create a more dynamic and responsive splash screen in Android applications. This approach eliminates the need for hardcoded values, ensuring your application behaves optimally, regardless of animation length.

Integrating Lottie animations effectively not only enhances the visual appeal of your application but also contributes to a seamless user experience. By following this guide, you’ve taken a significant step towards writing cleaner and more efficient code.

Now go ahead and implement this in your project, and enjoy the benefits of more dynamic animations!