SmallFloatingActionButton

Composable Component

The FAB represents the most important action on a screen. It puts key actions within reach.

Small FAB image
Common
@Composable
fun SmallFloatingActionButton(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    shape: Shape = FloatingActionButtonDefaults.smallShape,
    containerColor: Color = FloatingActionButtonDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    elevation: FloatingActionButtonElevation = FloatingActionButtonDefaults.elevation(),
    interactionSource: MutableInteractionSource? = null,
    content: @Composable () -> Unit,
)

Parameters
onClick called when this FAB is clicked
modifier the Modifier to be applied to this FAB
shape defines the shape of this FAB's container and shadow (when using elevation)
containerColor the color used for the background of this FAB. Use Color.Transparent to have no color.
contentColor the preferred color for content inside this FAB. Defaults to either the matching content color for containerColor, or to the current LocalContentColor if containerColor is not a color from the theme.
elevation FloatingActionButtonElevation used to resolve the elevation for this FAB in different states. This controls the size of the shadow below the FAB. Additionally, when the container color is ColorScheme.surface, this controls the amount of primary color applied as an overlay. See also: Surface.
interactionSource an optional hoisted MutableInteractionSource for observing and emitting Interactions for this FAB. You can use this to change the FAB's appearance or preview the FAB in different states. Note that if null is provided, interactions will still happen internally.
content the content of this FAB, typically an Icon

Code Examples

AnimatedFloatingActionButtonSample

@OptIn(ExperimentalMaterial3ExpressiveApi::class, ExperimentalMaterial3Api::class)
@Preview
@Composable
fun AnimatedFloatingActionButtonSample() {
    val listState = rememberLazyListState()
    // The FAB is initially shown. Upon scrolling past the first item we hide the FAB by using a
    // remembered derived state to minimize unnecessary compositions.
    val fabVisible by remember { derivedStateOf { listState.firstVisibleItemIndex == 0 } }
    Scaffold(
        floatingActionButton = {
            // A FAB should have a tooltip associated with it.
            TooltipBox(
                positionProvider =
                    TooltipDefaults.rememberTooltipPositionProvider(TooltipAnchorPosition.Above),
                tooltip = { PlainTooltip { Text("Localized description") } },
                state = rememberTooltipState(),
            ) {
                MediumFloatingActionButton(
                    modifier =
                        Modifier.animateFloatingActionButton(
                            visible = fabVisible,
                            alignment = Alignment.BottomEnd,
                        ),
                    onClick = { /* do something */ },
                ) {
                    Icon(
                        Icons.Filled.Add,
                        contentDescription = "Localized description",
                        modifier = Modifier.size(FloatingActionButtonDefaults.MediumIconSize),
                    )
                }
            }
        },
        floatingActionButtonPosition = FabPosition.End,
    ) {
        LazyColumn(state = listState, modifier = Modifier.fillMaxSize()) {
            for (index in 0 until 100) {
                item { Text(text = "List item - $index", modifier = Modifier.padding(24.dp)) }
            }
        }
    }
}

SmallFloatingActionButtonSample

@OptIn(ExperimentalMaterial3Api::class)
@Preview
@Composable
fun SmallFloatingActionButtonSample() {
    // A FAB should have a tooltip associated with it.
    TooltipBox(
        positionProvider =
            TooltipDefaults.rememberTooltipPositionProvider(TooltipAnchorPosition.Above),
        tooltip = { PlainTooltip { Text("Localized description") } },
        state = rememberTooltipState(),
    ) {
        SmallFloatingActionButton(onClick = { /* do something */ }) {
            Icon(Icons.Filled.Add, contentDescription = "Localized description")
        }
    }
}