TabRow

Functions summary

Unit
@Composable
TabRow(
    selectedTabIndex: Int,
    modifier: Modifier,
    containerColor: Color,
    contentColor: Color,
    indicator: @Composable (tabPositions: List<TabPosition>) -> Unit,
    divider: @Composable () -> Unit,
    tabs: @Composable () -> Unit
)

This function is deprecated. Replaced with PrimaryTabRow and SecondaryTabRow.
Cmn

Functions

TabRow

Cmn 
@Composable
fun TabRow(
    selectedTabIndex: Int,
    modifier: Modifier = Modifier,
    containerColor: Color = TabRowDefaults.primaryContainerColor,
    contentColor: Color = TabRowDefaults.primaryContentColor,
    indicator: @Composable (tabPositions: List<TabPosition>) -> Unit = @Composable { tabPositions ->
            if (selectedTabIndex < tabPositions.size) {
                TabRowDefaults.SecondaryIndicator(
                    Modifier.tabIndicatorOffset(tabPositions[selectedTabIndex])
                )
            }
        },
    divider: @Composable () -> Unit = @Composable { HorizontalDivider() },
    tabs: @Composable () -> Unit
): Unit

Material Design tabs

Material Design fixed tabs.

For primary indicator tabs, use PrimaryTabRow. For secondary indicator tabs, use SecondaryTabRow.

Fixed tabs display all tabs in a set simultaneously. They are best for switching between related content quickly, such as between transportation methods in a map. To navigate between fixed tabs, tap an individual tab, or swipe left or right in the content area.

A TabRow contains a row of Tabs, and displays an indicator underneath the currently selected tab. A TabRow places its tabs evenly spaced along the entire row, with each tab taking up an equal amount of space. See ScrollableTabRow for a tab row that does not enforce equal size, and allows scrolling to tabs that do not fit on screen.

A simple example with text tabs looks like:

import androidx.compose.foundation.layout.Column
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.PrimaryTabRow
import androidx.compose.material3.Tab
import androidx.compose.material3.Text
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.style.TextOverflow

var state by remember { mutableStateOf(0) }
val titles = listOf("Tab 1", "Tab 2", "Tab 3 with lots of text")
Column {
    PrimaryTabRow(selectedTabIndex = state) {
        titles.forEachIndexed { index, title ->
            Tab(
                selected = state == index,
                onClick = { state = index },
                text = { Text(text = title, maxLines = 2, overflow = TextOverflow.Ellipsis) },
            )
        }
    }
    Text(
        modifier = Modifier.align(Alignment.CenterHorizontally),
        text = "Text tab ${state + 1} selected",
        style = MaterialTheme.typography.bodyLarge,
    )
}

You can also provide your own custom tab, such as:

import androidx.compose.foundation.layout.Column
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.SecondaryTabRow
import androidx.compose.material3.Tab
import androidx.compose.material3.Text
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier

var state by remember { mutableStateOf(0) }
val titles = listOf("Tab 1", "Tab 2", "Tab 3")
Column {
    SecondaryTabRow(selectedTabIndex = state) {
        titles.forEachIndexed { index, title ->
            FancyTab(title = title, onClick = { state = index }, selected = (index == state))
        }
    }
    Text(
        modifier = Modifier.align(Alignment.CenterHorizontally),
        text = "Fancy tab ${state + 1} selected",
        style = MaterialTheme.typography.bodyLarge,
    )
}

Where the custom tab itself could look like:

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Tab
import androidx.compose.material3.Text
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp

Tab(selected, onClick) {
    Column(
        Modifier.padding(10.dp).height(50.dp).fillMaxWidth(),
        verticalArrangement = Arrangement.SpaceBetween,
    ) {
        Box(
            Modifier.size(10.dp)
                .align(Alignment.CenterHorizontally)
                .background(
                    color =
                        if (selected) MaterialTheme.colorScheme.primary
                        else MaterialTheme.colorScheme.background
                )
        )
        Text(
            text = title,
            style = MaterialTheme.typography.bodyLarge,
            modifier = Modifier.align(Alignment.CenterHorizontally),
        )
    }
}

As well as customizing the tab, you can also provide a custom indicator, to customize the indicator displayed for a tab. indicator will be placed to fill the entire TabRow, so it should internally take care of sizing and positioning the indicator to match changes to selectedTabIndex.

For example, given an indicator that draws a rounded rectangle near the edges of the Tab:

import androidx.compose.foundation.BorderStroke
import androidx.compose.foundation.border
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.Tab
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.unit.dp

// Draws a rounded rectangular with border around the Tab, with a 5.dp padding from the edges
// Color is passed in as a parameter [color]
Box(
    modifier
        .padding(5.dp)
        .fillMaxSize()
        .border(BorderStroke(2.dp, color), RoundedCornerShape(5.dp))
)

We can reuse TabRowDefaults.tabIndicatorOffset and just provide this indicator, as we aren't changing how the size and position of the indicator changes between tabs:

import androidx.compose.foundation.layout.Column
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.SecondaryTabRow
import androidx.compose.material3.Tab
import androidx.compose.material3.Text
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier

var state by remember { mutableStateOf(0) }
val titles = listOf("Tab 1", "Tab 2", "Tab 3")

Column {
    SecondaryTabRow(
        selectedTabIndex = state,
        indicator = {
            FancyIndicator(
                MaterialTheme.colorScheme.primary,
                Modifier.tabIndicatorOffset(state),
            )
        },
    ) {
        titles.forEachIndexed { index, title ->
            Tab(selected = state == index, onClick = { state = index }, text = { Text(title) })
        }
    }
    Text(
        modifier = Modifier.align(Alignment.CenterHorizontally),
        text = "Fancy indicator tab ${state + 1} selected",
        style = MaterialTheme.typography.bodyLarge,
    )
}

You may also want to use a custom transition, to allow you to dynamically change the appearance of the indicator as it animates between tabs, such as changing its color or size. indicator is stacked on top of the entire TabRow, so you just need to provide a custom transition that animates the offset of the indicator from the start of the TabRow. For example, take the following example that uses a transition to animate the offset, width, and color of the same FancyIndicator from before, also adding a physics based 'spring' effect to the indicator in the direction of motion:

import androidx.compose.animation.animateColorAsState
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.AnimationVector1D
import androidx.compose.animation.core.VectorConverter
import androidx.compose.animation.core.spring
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Tab
import androidx.compose.material3.TabPosition
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.CornerRadius
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.layout.Measurable
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp

val colors =
    listOf(
        MaterialTheme.colorScheme.primary,
        MaterialTheme.colorScheme.secondary,
        MaterialTheme.colorScheme.tertiary,
    )
var startAnimatable by remember { mutableStateOf<Animatable<Dp, AnimationVector1D>?>(null) }
var endAnimatable by remember { mutableStateOf<Animatable<Dp, AnimationVector1D>?>(null) }
val coroutineScope = rememberCoroutineScope()
val indicatorColor: Color by animateColorAsState(colors[index % colors.size], label = "")

Box(
    Modifier.tabIndicatorLayout {
            measurable: Measurable,
            constraints: Constraints,
            tabPositions: List<TabPosition> ->
            val newStart = tabPositions[index].left
            val newEnd = tabPositions[index].right
            val startAnim =
                startAnimatable
                    ?: Animatable(newStart, Dp.VectorConverter).also { startAnimatable = it }

            val endAnim =
                endAnimatable
                    ?: Animatable(newEnd, Dp.VectorConverter).also { endAnimatable = it }

            if (endAnim.targetValue != newEnd) {
                coroutineScope.launch {
                    endAnim.animateTo(
                        newEnd,
                        animationSpec =
                            if (endAnim.targetValue < newEnd) {
                                spring(dampingRatio = 1f, stiffness = 1000f)
                            } else {
                                spring(dampingRatio = 1f, stiffness = 50f)
                            },
                    )
                }
            }

            if (startAnim.targetValue != newStart) {
                coroutineScope.launch {
                    startAnim.animateTo(
                        newStart,
                        animationSpec =
                            // Handle directionality here, if we are moving to the right, we
                            // want the right side of the indicator to move faster, if we are
                            // moving to the left, we want the left side to move faster.
                            if (startAnim.targetValue < newStart) {
                                spring(dampingRatio = 1f, stiffness = 50f)
                            } else {
                                spring(dampingRatio = 1f, stiffness = 1000f)
                            },
                    )
                }
            }

            val indicatorEnd = endAnim.value.roundToPx()
            val indicatorStart = startAnim.value.roundToPx()

            // Apply an offset from the start to correctly position the indicator around the tab
            val placeable =
                measurable.measure(
                    constraints.copy(
                        maxWidth = indicatorEnd - indicatorStart,
                        minWidth = indicatorEnd - indicatorStart,
                    )
                )
            layout(constraints.maxWidth, constraints.maxHeight) {
                val contentWidth = tabPositions[index].contentWidth.roundToPx()
                val tabWidth = tabPositions[index].width.roundToPx()
                val relativeOffset = if (isScrollable) (tabWidth - contentWidth) / 2 else 0
                placeable.place(indicatorStart - relativeOffset, 0)
            }
        }
        .padding(5.dp)
        .fillMaxSize()
        .drawWithContent {
            drawRoundRect(
                color = indicatorColor,
                cornerRadius = CornerRadius(5.dp.toPx()),
                style = Stroke(width = 2.dp.toPx()),
            )
        }
)

We can now just pass this indicator directly to TabRow:

import androidx.compose.foundation.layout.Column
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.SecondaryTabRow
import androidx.compose.material3.Tab
import androidx.compose.material3.Text
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier

var state by remember { mutableStateOf(0) }
val titles = listOf("Tab 1", "Tab 2", "Tab 3")

Column {
    SecondaryTabRow(
        selectedTabIndex = state,
        indicator = { FancyAnimatedIndicatorWithModifier(state) },
    ) {
        titles.forEachIndexed { index, title ->
            Tab(selected = state == index, onClick = { state = index }, text = { Text(title) })
        }
    }
    Text(
        modifier = Modifier.align(Alignment.CenterHorizontally),
        text = "Fancy transition tab ${state + 1} selected",
        style = MaterialTheme.typography.bodyLarge,
    )
}
Parameters
selectedTabIndex: Int

the index of the currently selected tab
modifier: Modifier = Modifier

the Modifier to be applied to this tab row
containerColor: Color = TabRowDefaults.primaryContainerColor

the color used for the background of this tab row. Use Color.Transparent to have no color.
contentColor: Color = TabRowDefaults.primaryContentColor

the preferred color for content inside this tab row. Defaults to either the matching content color for containerColor, or to the current LocalContentColor if containerColor is not a color from the theme.
indicator: @Composable (tabPositions: List<TabPosition>) -> Unit = @Composable { tabPositions -> if (selectedTabIndex < tabPositions.size) { TabRowDefaults.SecondaryIndicator( Modifier.tabIndicatorOffset(tabPositions[selectedTabIndex]) ) } }

the indicator that represents which tab is currently selected. By default this will be a TabRowDefaults.SecondaryIndicator, using a TabRowDefaults.tabIndicatorOffset modifier to animate its position. Note that this indicator will be forced to fill up the entire tab row, so you should use TabRowDefaults.tabIndicatorOffset or similar to animate the actual drawn indicator inside this space, and provide an offset from the start.
divider: @Composable () -> Unit = @Composable { HorizontalDivider() }

the divider displayed at the bottom of the tab row. This provides a layer of separation between the tab row and the content displayed underneath.
tabs: @Composable () -> Unit

the tabs inside this tab row. Typically this will be multiple Tabs. Each element inside this lambda will be measured and placed evenly across the row, each taking up equal space.