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A floating action button (FAB) represents the primary action of a screen.

Floating action button image

Last updated:


dependencies {


fun FloatingActionButton(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    interactionSource: MutableInteractionSource? = null,
    shape: Shape = MaterialTheme.shapes.small.copy(CornerSize(percent = 50)),
    backgroundColor: Color = MaterialTheme.colors.secondary,
    contentColor: Color = contentColorFor(backgroundColor),
    elevation: FloatingActionButtonElevation = FloatingActionButtonDefaults.elevation(),
    content: @Composable () -> Unit


onClickcallback invoked when this FAB is clicked
modifier[Modifier] to be applied to this FAB.
interactionSourcean optional hoisted [MutableInteractionSource] for observing and emitting [Interaction]s 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.
shapeThe [Shape] of this FAB
backgroundColorThe background color. Use [Color.Transparent] to have no color
contentColorThe preferred content color for content inside this FAB
elevation[FloatingActionButtonElevation] used to resolve the elevation for this FAB in different states. This controls the size of the shadow below the FAB.
contentthe content of this FAB - this is typically an [Icon].

Code Example


fun SimpleFab() {
    FloatingActionButton(onClick = { /*do something*/ }) {
        Icon(Icons.Filled.Favorite, contentDescription = "Localized description")