![]() ![]() Let’s say you want cornerRadius to speed up quickly and slow down gradually: val cornerRadius by transition.animateDp( var containerState by remember ĬontainerState.Fullscreen -> AddContentScreen()Īll child animations are managed using the Transition APIĮxecuting the provided code, we achieve an animation with the container transform style: FAB is transformed into a full-screen page with a “container transform” styleįurthermore, each animation can be configured to your liking by providing a transitionSpec. The same needs to be done for padding, elevation, and backgroundColor, but to synchronize all our animations we need to use the Transition API. To animate cornerRadius change we can use animateDpAsState as follows: val cornerRadius: Dp by animateDpAsState( When the provided targetValue is changed, the animation will run automatically. This Composable function is overloaded for different parameter types such as Float, Color, Offset, etc. And as you might have guessed, to improve the color animation we need to have a shared backgroundColor animation.Ĭompose has many built-in animation mechanisms to animate primitive values like animateDpAsState , animateFloatAsState , animateColorAsState and many others including generic animateValueAsState where you can animate almost everything by providing your own TwoWa圜onverter.Īnimate*AsState - fire-and-forget animation function for *. To fix the first two problems we need to have a shared shape animation between UI components which includes cornerRadius, elevation and padding. background color is not changing seamlessly.the fab flies diagonally instead of staying in the same place.enter/exit transitions don’t follow an “expanding” pattern.The code above gets us very close to the desired result: Transition from the FAB to the full-screen page with AnimatedContent To implement a simple transition from one composable to another we can use the following code snippet:īased on the state we either render a FAB or AddContentScreen composableīy default, the AnimatedContent uses delayed fadeIn and scaleIn animations along with SizeTransform to animate size changes of the content. Its content for different target states is defined in a mapping between a target state and a composable function. ![]() To animate between two composables Jetpack Compose provides a convenient API - AnimatedContent.ĪnimatedContent is a container that automatically animates its content when Transition.targetState changes. The final animation □ : the enter transition is a little abrupt, but only those who get to the end will know why¹ Coding Shared element transitions are not yet available in Jetpack Compose they are either in Backlog or In Focus, so we will have to leverage existing animation APIs. This article is focused on the implementation of an animation that transforms a FAB into a full-screen page. Container transform examples from Material Components for Android Container transform is an animation pattern that transforms one container into another, typically using a shared element to connect two UI elements.
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