Row

Functions summary

inline Unit
@Composable
Row(
    modifier: Modifier,
    horizontalArrangement: Arrangement.Horizontal,
    verticalAlignment: Alignment.Vertical,
    content: @Composable RowScope.() -> Unit
)

A layout composable that places its children in a horizontal sequence.
Cmn

Functions

Row

Cmn 
@Composable
inline fun Row(
    modifier: Modifier = Modifier,
    horizontalArrangement: Arrangement.Horizontal = Arrangement.Start,
    verticalAlignment: Alignment.Vertical = Alignment.Top,
    content: @Composable RowScope.() -> Unit
): Unit

A layout composable that places its children in a horizontal sequence. For a layout composable that places its children in a vertical sequence, see Column. Note that by default items do not scroll; see Modifier.horizontalScroll to add this behavior. For a horizontally scrollable list that only composes and lays out the currently visible items see LazyRow.

The Row layout is able to assign children widths according to their weights provided using the RowScope.weight modifier. If a child is not provided a weight, it will be asked for its preferred width before the sizes of the children with weights are calculated proportionally to their weight based on the remaining available space. Note that if the Row is horizontally scrollable or part of a horizontally scrollable container, any provided weights will be disregarded as the remaining available space will be infinite.

When none of its children have weights, a Row will be as small as possible to fit its children one next to the other. In order to change the width of the Row, use the Modifier.width modifiers; e.g. to make it fill the available width Modifier.fillMaxWidth can be used. If at least one child of a Row has a weight, the Row will fill the available width, so there is no need for Modifier.fillMaxWidth. However, if Row's size should be limited, the Modifier.width or Modifier.size layout modifiers should be applied.

When the size of the Row is larger than the sum of its children sizes, a horizontalArrangement can be specified to define the positioning of the children inside the Row. See Arrangement for available positioning behaviors; a custom arrangement can also be defined using the constructor of Arrangement. Below is an illustration of different horizontal arrangements:

Row arrangements

Example usage:

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.size
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

Row {
    // The child with no weight will have the specified size.
    Box(Modifier.size(40.dp, 80.dp).background(Color.Magenta))
    // Has weight, the child will occupy half of the remaining width.
    Box(Modifier.height(40.dp).weight(1f).background(Color.Yellow))
    // Has weight and does not fill, the child will occupy at most half of the remaining width.
    // Therefore it will occupy 80.dp (its preferred width) if the assigned width is larger.
    Box(Modifier.size(80.dp, 40.dp).weight(1f, fill = false).background(Color.Green))
}

Note that if two or more Text components are placed in a Row, normally they should be aligned by their first baselines. Row as a general purpose container does not do it automatically so developers need to handle this manually. This is achieved by adding a RowScope.alignByBaseline modifier to every such Text component. By default this modifier aligns by FirstBaseline. If, however, you need to align Texts by LastBaseline for example, use a more general RowScope.alignBy modifier.

See example of using Texts inside the Row:

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.size
import androidx.compose.material.Text
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

Row(Modifier.fillMaxHeight()) {
    // The center of the magenta Box and the baselines of the two texts will be
    // vertically aligned. Note that alignBy() or alignByBaseline() has to be specified
    // for all children we want to take part in the alignment. For example, alignByBaseline()
    // means that the baseline of the text should be aligned with the alignment line
    // (possibly another baseline) specified for siblings using alignBy or alignByBaseline.
    // If no other sibling had alignBy() or alignByBaseline(), the modifier would have no
    // effect.
    Box(
        modifier =
            Modifier.size(80.dp, 40.dp)
                .alignBy { it.measuredHeight / 2 }
                .background(Color.Magenta)
    )
    Text(
        text = "Text 1",
        fontSize = 40.sp,
        modifier = Modifier.alignByBaseline().background(color = Color.Red),
    )
    Text(text = "Text 2", modifier = Modifier.alignByBaseline().background(color = Color.Cyan))
}
Parameters
modifier: Modifier = Modifier

The modifier to be applied to the Row.
horizontalArrangement: Arrangement.Horizontal = Arrangement.Start

The horizontal arrangement of the layout's children.
verticalAlignment: Alignment.Vertical = Alignment.Top

The vertical alignment of the layout's children.
content: @Composable RowScope.() -> Unit

The content of the Row
See also
Column
LazyRow