---
title: "FloatingActionButton"
description: "A floating action button (FAB) represents the primary action of a screen."
type: "component"
social_image: "/static/images/material/floating-action-button.png"
---

<div class='type'>Composable Component</div>



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

<img loading='lazy' class='hero-img' alt='Floating action button image' src='/static/images/material/floating-action-button.png'>

<a id='references'></a>

<div class='sourceset sourceset-common'>Common</div>


```kotlin
@Composable
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,
)
```


#### Parameters

| | |
| --- | --- |
| onClick | callback invoked when this FAB is clicked |
| modifier | `Modifier` to be applied to this FAB. |
| interactionSource | an 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. |
| shape | The `Shape` of this FAB |
| backgroundColor | The background color. Use `Color.Transparent` to have no color |
| contentColor | The 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. |
| content | the content of this FAB - this is typically an `Icon`. |






## Code Examples
### SimpleFab
```kotlin
@Composable
fun SimpleFab() {
    FloatingActionButton(onClick = { /*do something*/ }) {
        Icon(Icons.Filled.Favorite, contentDescription = "Localized description")
    }
}
```