Weights in Jetpack compose

Question

Is it possible to do weights in Jetpack Compose? For example, I'd like to set it up in such a way that one item is weighted as 1/3 of a layout, and the other takes up the remaining 2/3.

In the XML/ViewGroup style, you can achieve this using LinearLayouts and ConstraintLayouts. To my dismay, however, it doesn't seem possible using Jetpack Compose.

Example:

In ConstraintLayout, this is done as follows:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <View
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:id="@+id/red"
        android:background="@color/red"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/blue"
        app:layout_constraintHorizontal_weight="1"/>
    <View
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:id="@+id/blue"
        android:background="@color/blue"
        app:layout_constraintStart_toEndOf="@id/red"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_weight="2"/>
</androidx.constraintlayout.widget.ConstraintLayout>

In LinearLayouts, this is done as follows:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">
    <View
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:id="@+id/red"
        android:background="@color/red"
        android:layout_weight="1"/>
    <View
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:id="@+id/blue"
        android:background="@color/blue"
        android:layout_weight="2"/>
</LinearLayout>

I know that you can use Tables to get evenly distributed things, but I want an uneven distribution.

Solution 1

You can use the Modifier.weight
Something like:

Row() {
    Column(
        Modifier.weight(1f).background(Blue)){
        Text(text = "Weight = 1", color = Color.White)
    }
    Column(
        Modifier.weight(2f).background(Yellow)
    ) {
        Text(text = "Weight = 2")
    }
}

Solution 2

Since "0.1.0-dev09" modifiers are moved on an interface, you can use

Modifier.weight(float, boolean)

to divide the vertical/horizontal space remaining after measuring unweighted child elements and distribute it according to this weight

 Column {
        Row(modifier = Modifier.weight(2.0f, true)) {
            Box (
                modifier = Modifier.fillMaxWidth().fillMaxHeight(),
                backgroundColor = Color.Red
            )
        }
        Row(modifier = Modifier.weight(1.0f, true)) {
            Box (
                modifier = Modifier.fillMaxWidth().fillMaxHeight(),
                backgroundColor = Color.Blue,
                gravity = ContentGravity.Center
            ) {
                Text(text = "A sample text")
            }
        }
        Row(modifier = Modifier.weight(2.0f, true)) {
            Box (
                modifier = Modifier.fillMaxWidth().fillMaxHeight(),
                backgroundColor = Color.Yellow
            )
        }
    }

Solution 3

The "0.1.0-dev04" release of Jetpack Compose contains changes, and FlexRow is deprecated. I can propose the following solution:

Row {
    Card(modifier = LayoutFlexible(1f), color = Color.Red) {
        Container(expanded = true, height = 50.dp) {

        }
    }
    Card(modifier = LayoutFlexible(2f), color = Color.Green) {
        Container(expanded = true, height = 50.dp) {

        }
    }
}

Result:

The LayoutFlexible(flex = _f) helps us to solve the issue and Modifier can be applied to any container.

Solution 4

Use Modifier.weight(float) on the objects inside a container. You could also use constraintlayout or the Low Level Layout Composable. Check out the official compose layout codelab in compose pathways for more info on the same

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