Jetpack compose - change bottom bar cutout color

Question

How to change the color of the cut out for the bottom bar?

I know it takes the color from MaterialTheme.colors.background, but I don't want to change the background color for all components, only for the bottom bar. (The white color in the cut out in the picture.)

I have tried different things, for example setting a new theme just for the bottom bar, but that doesn't work.

val bottomBarColors = MaterialTheme.colors.copy(background = Color.LightGray)
...

bottomBar = {
    MaterialTheme(
        colors = bottomBarColors,
        typography = MaterialTheme.typography,
        shapes = MaterialTheme.shapes
    ) {
        BottomAppBar(
            cutoutShape = fabShape,
            content = {
                MyBottomNavigation(navController, bottomNavigationItems)
            })
    }
}

would you pleas share your codes?

Mostafa Imani
– Mostafa Imani

2022-12-29 05:25:15 +00:00
Commented Dec 29, 2022 at 5:25 — Mostafa Imani
– Mostafa Imani, Commented Dec 29, 2022 at 5:25

Gabriele Mariotti · Accepted Answer · 2021-07-28 19:37:04Z

3

In your case you can apply the Modifier.background to the BottomAppBar:

    bottomBar = {
        BottomAppBar(
            modifier = Modifier.background(Color.Red),
            cutoutShape = fabShape) {

            BottomNavigation {
                /* .... */
            }
        }
    }

answered Jul 28, 2021 at 19:37

Gabriele Mariotti

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1 Comment

mrzbn Over a year ago

how to make that color to be transparent?

Mackan · Accepted Answer · 2021-07-28 18:26:12Z

-1

The solution was easier than I thought. Just add something below the bottom bar:

bottomBar = {
        Box {
            Spacer(modifier = Modifier.matchParentSize().background(color = Color.Blue))
            BottomAppBar(
                cutoutShape = fabShape,
                content = {
                    MyBottomNavigation(navController, bottomNavigationItems)
                })
    }
}

answered Jul 28, 2021 at 18:26

Mackan

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2 Comments

Richard Onslow Roper Over a year ago

Check out Gabriele's answer. That is appropriate.

Richard Onslow Roper Over a year ago

More official way of doing it

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