Скачать или смотреть Solving the Jetpack Compose BottomSheet Animation Issue

Discover how to animate the corner radius of a BottomSheet in Jetpack Compose effectively, ensuring a smooth user experience even during drag events.
---
This video is based on the question https://stackoverflow.com/q/75884833/ asked by the user 'Max' ( https://stackoverflow.com/u/20199848/ ) and on the answer https://stackoverflow.com/a/75899846/ provided by the user 'Max' ( https://stackoverflow.com/u/20199848/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Jetpack compose bottomsheet animation

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Solving the Jetpack Compose BottomSheet Animation Issue: A Practical Guide

Introduction

If you’re developing an Android application using Jetpack Compose, you may have encountered issues related to animating the corner radius of a BottomSheet. This feature is essential for creating visually appealing interfaces, but animating it correctly, particularly during user interactions like dragging, can be challenging.

In this post, we'll walk you through understanding the underlying issues when animating BottomSheet corners, and how to implement a solution effectively. If you’ve dealt with similar problems, or if you’re just curious about the animations in Jetpack Compose, this guide is for you!

Understanding the Problem

The Animation Dilemma

When implementing animations for a BottomSheet in Jetpack Compose, many developers notice that the animation's progress value can sometimes be unresponsive or erratic. For instance, you may observe progress values oscillating between 1.0 and other fractions unexpectedly, stepping out of sync with user dragging actions.

Here's an example of some problematic progress updates you might log:

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

This can lead to inconsistent UI states and reduced user experience, especially if the corner radius doesn’t adapt dynamically.

The Code Snippet

You might have tried the following code to set the radius:

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

While the intention is correct, it may not achieve the responsive behavior you want during dragging.

The Solution: A Clear Step-by-Step Approach

After experimenting and plenty of debugging, a solution to get the desired corner radius effect while dragging was discovered. Below are the detailed steps to implement an effective BottomSheet animation.

Step 1: Calculate the Bottom Sheet Height

To adjust the corner radius more dynamically, you first need to calculate the height of the BottomSheet relative to the screen height using the following code:

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

Step 2: Define the Animation Fraction

You then derive a fraction based on this height to ensure that it falls within the expected range:

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

Make sure the fraction stays between 0 and 1. The value transformations ensure a smooth range adjustment during the animation.

Step 3: Implement the Dynamic Corner Radius

Now, apply the computed radius to your BottomSheet as shown below:

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

Conclusion

Animating the corner radius of a BottomSheet can enhance user experience immensely when done correctly. By applying the above methods, you ensure that your BottomSheet remains visually responsive during user interactions.

Through careful calculation of screen height and BottomSheet height, you dynamically update the corner radius to create a smooth animation that is both pleasing and functional.

We hope this guide helps you tackle animation challenges in Jetpack Compose efficiently! Happy coding!