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


A bottom app bar displays navigation and key actions at the bottom of small screens.

<img loading='lazy' class='hero-img' alt='Bottom app bar image' src='/static/images/material3/bottom-app-bar.png'>

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


<h2 id="bottomappbar-actions-modifier-floatingactionbutton-containercolor-contentcolor-tonalelevation-contentpadding-windowinsets">BottomAppBar</h2>

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


```kotlin
@Composable
fun BottomAppBar(
    actions: @Composable RowScope.() -> Unit,
    modifier: Modifier = Modifier,
    floatingActionButton: @Composable (() -> Unit)? = null,
    containerColor: Color = BottomAppBarDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    tonalElevation: Dp = BottomAppBarDefaults.ContainerElevation,
    contentPadding: PaddingValues = BottomAppBarDefaults.ContentPadding,
    windowInsets: WindowInsets = BottomAppBarDefaults.windowInsets,
) =
    BottomAppBar(
        actions = actions,
        modifier = modifier,
        floatingActionButton = floatingActionButton,
        containerColor = containerColor,
        contentColor = contentColor,
        tonalElevation = tonalElevation,
        contentPadding = contentPadding,
        windowInsets = windowInsets,
        scrollBehavior = null,
    )
```


#### Parameters

| | |
| --- | --- |
| actions | the icon content of this BottomAppBar. The default layout here is a `Row`, so content inside will be placed horizontally. |
| modifier | the `Modifier` to be applied to this BottomAppBar |
| floatingActionButton | optional floating action button at the end of this BottomAppBar |
| containerColor | the color used for the background of this BottomAppBar. Use `Color.Transparent` to have no color. |
| contentColor | the preferred color for content inside this BottomAppBar. Defaults to either the matching content color for `containerColor`, or to the current `LocalContentColor` if `containerColor` is not a color from the theme. |
| tonalElevation | when `containerColor` is `ColorScheme.surface`, a translucent primary color overlay is applied on top of the container. A higher tonal elevation value will result in a darker color in light theme and lighter color in dark theme. See also: `Surface`. |
| contentPadding | the padding applied to the content of this BottomAppBar |
| windowInsets | a window insets that app bar will respect. |


<hr class="docs-overload-divider">


<h2 id="bottomappbar-actions-modifier-floatingactionbutton-containercolor-contentcolor-tonalelevation-contentpadding-windowinsets-scrollbehavior">BottomAppBar</h2>

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


```kotlin
@ExperimentalMaterial3Api
@Composable
fun BottomAppBar(
    actions: @Composable RowScope.() -> Unit,
    modifier: Modifier = Modifier,
    floatingActionButton: @Composable (() -> Unit)? = null,
    containerColor: Color = BottomAppBarDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    tonalElevation: Dp = BottomAppBarDefaults.ContainerElevation,
    contentPadding: PaddingValues = BottomAppBarDefaults.ContentPadding,
    windowInsets: WindowInsets = BottomAppBarDefaults.windowInsets,
    scrollBehavior: BottomAppBarScrollBehavior? = null,
) =
    BottomAppBar(
        modifier = modifier,
        containerColor = containerColor,
        contentColor = contentColor,
        tonalElevation = tonalElevation,
        windowInsets = windowInsets,
        contentPadding = contentPadding,
        scrollBehavior = scrollBehavior,
    ) {
        Row(
            modifier = Modifier.weight(1f),
            horizontalArrangement = Arrangement.Start,
            verticalAlignment = Alignment.CenterVertically,
            content = actions,
        )
        if (floatingActionButton != null) {
            Box(
                Modifier.fillMaxHeight()
                    .padding(top = FABVerticalPadding, end = FABHorizontalPadding),
                contentAlignment = Alignment.TopStart,
            ) {
                floatingActionButton()
            }
        }
    }
```


#### Parameters

| | |
| --- | --- |
| actions | the icon content of this BottomAppBar. The default layout here is a `Row`, so content inside will be placed horizontally. |
| modifier | the `Modifier` to be applied to this BottomAppBar |
| floatingActionButton | optional floating action button at the end of this BottomAppBar |
| containerColor | the color used for the background of this BottomAppBar. Use `Color.Transparent` to have no color. |
| contentColor | the preferred color for content inside this BottomAppBar. Defaults to either the matching content color for `containerColor`, or to the current `LocalContentColor` if `containerColor` is not a color from the theme. |
| tonalElevation | when `containerColor` is `ColorScheme.surface`, a translucent primary color overlay is applied on top of the container. A higher tonal elevation value will result in a darker color in light theme and lighter color in dark theme. See also: `Surface`. |
| contentPadding | the padding applied to the content of this BottomAppBar |
| windowInsets | a window insets that app bar will respect. |
| scrollBehavior | a `BottomAppBarScrollBehavior` which holds various offset values that will be applied by this bottom app bar to set up its height. A scroll behavior is designed to work in conjunction with a scrolled content to change the bottom app bar appearance as the content scrolls. Note that the bottom app bar will not react to scrolling in case a touch exploration service (e.g., TalkBack) is active. See `BottomAppBarScrollBehavior.nestedScrollConnection`. |


<hr class="docs-overload-divider">


<h2 id="bottomappbar-modifier-containercolor-contentcolor-tonalelevation-contentpadding-windowinsets-content">BottomAppBar</h2>

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


```kotlin
@Composable
fun BottomAppBar(
    modifier: Modifier = Modifier,
    containerColor: Color = BottomAppBarDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    tonalElevation: Dp = BottomAppBarDefaults.ContainerElevation,
    contentPadding: PaddingValues = BottomAppBarDefaults.ContentPadding,
    windowInsets: WindowInsets = BottomAppBarDefaults.windowInsets,
    content: @Composable RowScope.() -> Unit,
) =
    BottomAppBar(
        modifier = modifier,
        containerColor = containerColor,
        contentColor = contentColor,
        tonalElevation = tonalElevation,
        contentPadding = contentPadding,
        windowInsets = windowInsets,
        scrollBehavior = null,
        content = content,
    )
```


#### Parameters

| | |
| --- | --- |
| modifier | the `Modifier` to be applied to this BottomAppBar |
| containerColor | the color used for the background of this BottomAppBar. Use `Color.Transparent` to have no color. |
| contentColor | the preferred color for content inside this BottomAppBar. Defaults to either the matching content color for `containerColor`, or to the current `LocalContentColor` if `containerColor` is not a color from the theme. |
| tonalElevation | when `containerColor` is `ColorScheme.surface`, a translucent primary color overlay is applied on top of the container. A higher tonal elevation value will result in a darker color in light theme and lighter color in dark theme. See also: `Surface`. |
| contentPadding | the padding applied to the content of this BottomAppBar |
| windowInsets | a window insets that app bar will respect. |
| content | the content of this BottomAppBar. The default layout here is a `Row`, so content inside will be placed horizontally. |


<hr class="docs-overload-divider">


<h2 id="bottomappbar-modifier-containercolor-contentcolor-tonalelevation-contentpadding-windowinsets-scrollbehavior-content">BottomAppBar</h2>

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


```kotlin
@ExperimentalMaterial3Api
@Composable
fun BottomAppBar(
    modifier: Modifier = Modifier,
    containerColor: Color = BottomAppBarDefaults.containerColor,
    contentColor: Color = contentColorFor(containerColor),
    tonalElevation: Dp = BottomAppBarDefaults.ContainerElevation,
    contentPadding: PaddingValues = BottomAppBarDefaults.ContentPadding,
    windowInsets: WindowInsets = BottomAppBarDefaults.windowInsets,
    scrollBehavior: BottomAppBarScrollBehavior? = null,
    content: @Composable RowScope.() -> Unit,
)
```


#### Parameters

| | |
| --- | --- |
| modifier | the `Modifier` to be applied to this BottomAppBar |
| containerColor | the color used for the background of this BottomAppBar. Use `Color.Transparent` to have no color. |
| contentColor | the preferred color for content inside this BottomAppBar. Defaults to either the matching content color for `containerColor`, or to the current `LocalContentColor` if `containerColor` is not a color from the theme. |
| tonalElevation | when `containerColor` is `ColorScheme.surface`, a translucent primary color overlay is applied on top of the container. A higher tonal elevation value will result in a darker color in light theme and lighter color in dark theme. See also: `Surface`. |
| contentPadding | the padding applied to the content of this BottomAppBar |
| windowInsets | a window insets that app bar will respect. |
| scrollBehavior | a `BottomAppBarScrollBehavior` which holds various offset values that will be applied by this bottom app bar to set up its height. A scroll behavior is designed to work in conjunction with a scrolled content to change the bottom app bar appearance as the content scrolls. Note that the bottom app bar will not react to scrolling in case a touch exploration service (e.g., TalkBack) is active. See `BottomAppBarScrollBehavior.nestedScrollConnection`. |
| content | the content of this BottomAppBar. The default layout here is a `Row`, so content inside will be placed horizontally. |