How to smoothly transition between composables when switching states in Jetpack Compose?

Question

I have a Row with two buttons, each setting a different state (SomeState.FirstState or SomeState.SecondState) when clicked. Depending on the state, I want to show a different composable, with smooth transitions between them.

Row(
    modifier = Modifier.fillMaxWidth(),
    horizontalArrangement = Arrangement.SpaceEvenly
) {
    Button(onClick = {
        state = SomeState.FirstState
    }) {
        Text(text = "Set first state")
    }
    Button(onClick = {
        state = SomeState.SecondState("Second state text")
    }) {
        Text(text = "Set second state")
    }
}

AnimatedVisibility(
    visible = state is SomeState.SecondState,
    modifier = Modifier.align(Alignment.CenterHorizontally)
) {
    if (state is SomeState.SecondState) {
        SecondStateText(state = state as SomeState.SecondState)
    }
}

The problem is that when SomeState.FirstState is set, the previous composable abruptly disappears. How can I smoothly transition between the composables when switching states, to provide a better user experience?

Hiren Rafaliya · Accepted Answer · 2024-03-21 16:57:37Z

0

Don't need to repeatedly check the condition inside the AnimatedVisibility. Content inside it will only show if the visible paramter is true.

Specify the enter & exit transition to provide a better animation when view gets visible/invisible.

 val enterTransition = fadeIn() + scaleIn() // Enter animation
 val exitTransition = fadeOut() + scaleOut() // Exit animation

 AnimatedVisibility(
     visible = state is SomeState.SecondState,
     modifier = Modifier.align(Alignment.CenterHorizontally),
     enter = enterTransition,
     exit = exitTransition
 ) {
     SecondStateText(state = state as SomeState.SecondState)
 }

 AnimatedVisibility(
     visible = state is SomeState.FirstState,
     modifier = Modifier.align(Alignment.CenterHorizontally),
     enter = enterTransition,
     exit = exitTransition
 ) {
     FirstStateText(state = state as SomeState.FirstState)
 }

answered Mar 21, 2024 at 16:57

Hiren Rafaliya

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2 Comments

KramRus Over a year ago

I had almost the same code with a strict cast, and then the application crashed when state is changed

Hiren Rafaliya Over a year ago

Can you please also share the error of the crash with this. It'll help to debug the issue.

Vivek Gupta · Accepted Answer · 2024-03-21 18:16:11Z

you can use AnimatedContent to transition between your composable smoothly. AnimatedContent is a container that automatically animates its content when targetState changes. Its content for different target states is defined in a mapping between a target state and a composable function.

@Composable
@Sampled
fun SimpleAnimatedContentSample() {
    // enum class ContentState { Foo, Bar, Baz }
    @Composable
    fun Foo() {
        Box(
            Modifier
                .size(200.dp)
                .background(Color(0xffffdb00))
        )
    }

    @Composable
    fun Bar() {
        Box(
            Modifier
                .size(40.dp)
                .background(Color(0xffff8100))
        )
    }

    @Composable
    fun Baz() {
        Box(
            Modifier
                .size(80.dp, 20.dp)
                .background(Color(0xffff4400))
        )
    }

    var contentState: ContentState by remember { mutableStateOf(ContentState.Foo) }
    AnimatedContent(contentState) {
        when (it) {
            // Specifies the mapping between a given ContentState and a composable function.
            ContentState.Foo -> Foo()
            ContentState.Bar -> Bar()
            ContentState.Baz -> Baz()
        }
    }
}

credit : https://www.composables.com/animation/animatedcontent

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