How do I play and auto reverse a Lottie animation just once?

When using the Lottie animation library, you can typically control animation playback through its API. If you want the animation to play once and then automatically reverse, follow these steps:

Step 1: Setting Up the Lottie Animation View

First, ensure you have a LottieAnimationView in your application interface. You can add it to your layout file or create it programmatically.

Step 2: Configuring Animation Properties

Configure the animation playback properties, including the animation resource, playback count, and other relevant attributes.

Example:

xml
<com.airbnb.lottie.LottieAnimationView
    android:id="@+id/animation_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:lottie_fileName="example_animation.json"
    app:lottie_loop="false"
    app:lottie_autoPlay="false"
/>

Step 3: Writing Code to Control Animation

In your Activity or Fragment, locate the LottieAnimationView and set up listeners for playback and completion.

Example code:

java
LottieAnimationView animationView = findViewById(R.id.animation_view);

// Set up animation completion listener
animationView.addAnimatorListener(new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        // When animation ends, reverse it using reverseAnimation()
        animationView.reverseAnimation();
        animationView.playAnimation();
    }
});

// Start playing the animation
animationView.playAnimation();

In the above code, we use addAnimatorListener to detect when the animation ends. Upon completion, we reverse the animation using reverseAnimation() and restart playback. Since the animation is configured not to loop (app:lottie_loop="false"), it will stop after playing once.

Summary

By following these steps, you can make the Lottie animation play once and then automatically reverse. This approach is useful for creating engaging UI effects and enhancing user experience. In actual development, adjust the animation configuration and control logic based on your specific requirements.