FloatingActionButtonMenuScope

val horizontalAlignment: Alignment.Horizontal

@ExperimentalMaterial3ExpressiveApi
@Composable
fun FloatingActionButtonMenuScope.FloatingActionButtonMenuItem(
    onClick: () -> Unit,
    text: @Composable () -> Unit,
    icon: @Composable () -> Unit,
    modifier: Modifier = Modifier,
    containerColor: Color = MaterialTheme.colorScheme.primaryContainer,
    contentColor: Color = contentColorFor(containerColor)
): Unit

FAB Menu Items should be used within a FloatingActionButtonMenu to provide additional choices to the user after clicking a FAB.

import androidx.activity.compose.BackHandler
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.Label
import androidx.compose.material.icons.automirrored.filled.Message
import androidx.compose.material.icons.filled.Add
import androidx.compose.material.icons.filled.Archive
import androidx.compose.material.icons.filled.Close
import androidx.compose.material.icons.filled.Contacts
import androidx.compose.material.icons.filled.People
import androidx.compose.material.icons.filled.Snooze
import androidx.compose.material3.FloatingActionButtonMenu
import androidx.compose.material3.FloatingActionButtonMenuItem
import androidx.compose.material3.Icon
import androidx.compose.material3.Text
import androidx.compose.material3.ToggleFloatingActionButton
import androidx.compose.material3.ToggleFloatingActionButtonDefaults.animateIcon
import androidx.compose.material3.animateFloatingActionButton
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.vector.rememberVectorPainter
import androidx.compose.ui.semantics.CustomAccessibilityAction
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.customActions
import androidx.compose.ui.semantics.isTraversalGroup
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.semantics.traversalIndex
import androidx.compose.ui.unit.dp

val listState = rememberLazyListState()
val fabVisible by remember { derivedStateOf { listState.firstVisibleItemIndex == 0 } }

Box {
    LazyColumn(state = listState, modifier = Modifier.fillMaxSize()) {
        for (index in 0 until 100) {
            item { Text(text = "List item - $index", modifier = Modifier.padding(24.dp)) }
        }
    }

    val items =
        listOf(
            Icons.AutoMirrored.Filled.Message to "Reply",
            Icons.Filled.People to "Reply all",
            Icons.Filled.Contacts to "Forward",
            Icons.Filled.Snooze to "Snooze",
            Icons.Filled.Archive to "Archive",
            Icons.AutoMirrored.Filled.Label to "Label",
        )

    var fabMenuExpanded by rememberSaveable { mutableStateOf(false) }

    BackHandler(fabMenuExpanded) { fabMenuExpanded = false }

    FloatingActionButtonMenu(
        modifier = Modifier.align(Alignment.BottomEnd),
        expanded = fabMenuExpanded,
        button = {
            ToggleFloatingActionButton(
                modifier =
                    Modifier.semantics {
                            traversalIndex = -1f
                            stateDescription = if (fabMenuExpanded) "Expanded" else "Collapsed"
                            contentDescription = "Toggle menu"
                        }
                        .animateFloatingActionButton(
                            visible = fabVisible || fabMenuExpanded,
                            alignment = Alignment.BottomEnd
                        ),
                checked = fabMenuExpanded,
                onCheckedChange = { fabMenuExpanded = !fabMenuExpanded }
            ) {
                val imageVector by remember {
                    derivedStateOf {
                        if (checkedProgress > 0.5f) Icons.Filled.Close else Icons.Filled.Add
                    }
                }
                Icon(
                    painter = rememberVectorPainter(imageVector),
                    contentDescription = null,
                    modifier = Modifier.animateIcon({ checkedProgress })
                )
            }
        }
    ) {
        items.forEachIndexed { i, item ->
            FloatingActionButtonMenuItem(
                modifier =
                    Modifier.semantics {
                        isTraversalGroup = true
                        // Add a custom a11y action to allow closing the menu when focusing
                        // the last menu item, since the close button comes before the first
                        // menu item in the traversal order.
                        if (i == items.size - 1) {
                            customActions =
                                listOf(
                                    CustomAccessibilityAction(
                                        label = "Close menu",
                                        action = {
                                            fabMenuExpanded = false
                                            true
                                        }
                                    )
                                )
                        }
                    },
                onClick = { fabMenuExpanded = false },
                icon = { Icon(item.first, contentDescription = null) },
                text = { Text(text = item.second) },
            )
        }
    }
}