Kotlin Compose, Vertical Center Image & Bottom align text

Question

I'm currently transitioning from SwiftUI to Kotlin Compose and struggling with something that should be easy but I maybe tackling in the wrong way.

What I'm trying to do is have an image that is centrally aligned both vertically & horizontally, basically in the centre of the screen. Then I need two text values at the bottom of the screen. How should I tackle this, my current approach is to have a column set to .fillmaxsize() within this I have two rows one with an image, the other with another column with two rows of text and a Spacer(modifier = Modifier.weight(1f)) between the two rows

Everything is correctly horizontally aligned and the two text fields correctly bottom aligned, its the image that I'm unable to vertically centre.

@Composable fun testScreen() { Column(Modifier .background(Color.Blue) .fillMaxSize(), verticalArrangement = Arrangement.Center ) { Row(Modifier .fillMaxWidth() .background(Color.Green), horizontalArrangement = Arrangement.Center, verticalAlignment = Alignment.CenterVertically ) { Image( painterResource(R.someimagefile), contentDescription = "", contentScale = ContentScale.Crop, modifier = Modifier .size(300.dp) ) } Spacer(modifier = Modifier.weight(1f)) Row(Modifier .background(Color.Red) .fillMaxWidth(), horizontalArrangement = Arrangement.Center, ) { Column() { Text( text = "Text 1", color = Color.Black, textAlign = TextAlign.Center, modifier = Modifier .align(Alignment.CenterHorizontally) ) Text( text = "Text 2", fontSize = 20.sp, color = Color.Black, textAlign = TextAlign.Center, modifier = Modifier .align(Alignment.CenterHorizontally) ) } } } }

Raghunandan · Accepted Answer · 2023-02-07 06:06:52Z

If i understand your question correctly you want to center a image and have two texts on different line at the bottom.

You could use a constraint layout and you can center the image top to parent, start to parent, end to parent and bottom to parent. create a column/row and add constraints start to parent end to parent and bottom to parent. https://developer.android.com/jetpack/compose/layouts/constraintlayout

 ConstraintLayout(modifier = Modifier.fillMaxSize()) { val (image, columnTexts) = createRefs() Image( painter = painterResource(R.drawable.ic_launcher_background), contentDescription = "", contentScale = ContentScale.Crop, modifier = Modifier .size(300.dp) .clickable { } .constrainAs(image) { top.linkTo(parent.top) start.linkTo(parent.start) end.linkTo(parent.end) bottom.linkTo(parent.bottom) } ) Column(modifier= Modifier.wrapContentHeight().constrainAs(columnTexts) { end.linkTo(parent.end) start.linkTo(parent.start) bottom.linkTo(parent.bottom, margin = 16.dp,) }) { Text("Text1", modifier = Modifier.wrapContentWidth()) Text("Text2", modifier = Modifier.wrapContentWidth()) } }

Alternative way using box results in the same ui

@Composable fun AlternateUI() { Box( modifier = Modifier.fillMaxSize() ) { Column( modifier = Modifier.align(Alignment.Center), horizontalAlignment = Alignment.CenterHorizontally ) { Image( painter = painterResource(R.drawable.ic_launcher_background), contentDescription = "", contentScale = ContentScale.Crop, modifier = Modifier .size(300.dp) .clickable { }) } BottomText( modifier = Modifier .padding(bottom = 10.dp) .align(Alignment.BottomCenter) ) } } @Composable fun BottomText(modifier: Modifier) { Column( modifier = modifier.wrapContentWidth().wrapContentHeight().padding(10.dp), ) { Text(text = "line1", textAlign = TextAlign.Center) Text(text = "line2", textAlign = TextAlign.Center) } }

Thank you for the suggested approach which worked perfectly, I was unaware that constraint layout was available and clearly solves the nested row & columns issues.
welcome. yes constraint layout is available in compose as well.
@DuncanHill added alternate way using box without constraintlayout

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