I'm struggling with vertically centering text in Jetpack Compose version alpha-11. It appears that my font has a significant amount of padding and I'm unable to find a way to disable it. This has come up only once before on SO, as far as I can tell, here, but their answer of using a constraint layout seems to suggest that they simply positioned it absolutely, which isn't exactly a solution as much as a workaround, and something I'd like to avoid.
You can see it clearly in the screenshot below.
The code for that looks like this:
Column(verticalArrangement = Arrangement.Center) {
Text(
text = "Let's Go",
color = Color.White,
fontSize = 120.sp,
fontFamily = oswaldLightFontFamily(),
textAlign = TextAlign.Center,
modifier = Modifier.background(Color.Blue)
)
}
The arguments you would expect to position it -- verticalArrangement
and textAlign
-- do not do anything here but I'm including them to demonstrate what I've tried.
My workaround so far has been to use Modifier.graphicsLayer(translationY = -25f)
to shift it up but that seems like a terrible hack for something that should be so straightforward. It appears that in classic Android layouts, one could set android:includeFontPadding="false"
and that would bypass this behavior but there doesn't seem to be a similar option in Jetpack Compose.
Anyone encounter this?
If you want only to center horizontally just use: Column( modifier = Modifier. fillMaxWidth(), horizontalAlignment = Alignment. CenterHorizontally ) { Column ( ) { ... }
To center align content of Column along horizontal axis in Android Compose, set horizontalAlignment parameter with the value of Alignment. CenterHorizontally . Also, we may fill the maximum width by the Column using Modifier. fillMaxWidth().
To change font size of Text composable in Android Jetpack Compose, pass a required font size value for the optional fontSize parameter of Text composable. Make sure to import sp , as shown in the above code snippet, when you are assign fontSize property with scale-independent pixels.
According to https://issuetracker.google.com/issues/171394808, It seems this is one of the limitations of the current JetPack Compose.
This is also deal breaker for my app because the font used rely heavily with the includeFontPadding
. For current workaround, I create a CoreText that wraps TextView inside my compose.
Here's example of my wrapper, its not perfect but it does the job for my current use case:
@Composable
fun CoreText(
text: String,
modifier: Modifier = Modifier,
color: Color = Color.Unspecified,
textDecoration: TextDecoration? = null,
textAlign: TextAlign? = null,
overflow: TextOverflow = TextOverflow.Clip,
maxLines: Int = Int.MAX_VALUE,
style: TextStyle = Typography.body2,
onClick: (() -> Unit)? = null,
) {
AndroidView(
modifier = modifier,
factory = { context ->
TextView(context)
},
update = {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
it.setTextAppearance(style.fontWeight.toStyle())
} else {
it.setTextAppearance(it.context, style.fontWeight.toStyle())
}
if (overflow == TextOverflow.Ellipsis) {
it.ellipsize = TextUtils.TruncateAt.END
}
if (textDecoration != null) {
it.paintFlags = when (textDecoration) {
TextDecoration.Underline -> {
Paint.UNDERLINE_TEXT_FLAG
}
TextDecoration.LineThrough -> {
Paint.STRIKE_THRU_TEXT_FLAG
}
else -> 0
}
}
if (onClick != null) {
it.setOnClickListener { onClick.invoke() }
}
if (color != Color.Unspecified || style.color != Color.Unspecified) {
it.setTextColor(if (color == Color.Unspecified) style.color.toArgb() else color.toArgb())
}
it.textSize = style.fontSize.value
it.text = text
it.background = ColorDrawable(style.background.toArgb())
it.maxLines = maxLines
it.includeFontPadding = false
it.textAlignment = textAlign?.toStyle() ?: style.textAlign.toStyle()
}
)
}
// Replace with your style
fun FontWeight?.toStyle(): Int {
return when (this) {
FontWeight.Bold -> R.style.TextStyle_Bold
FontWeight.Normal -> R.style.TextStyle_Regular
FontWeight.Medium, FontWeight.SemiBold -> R.style.TextStyle_Medium
else -> -1
}
}
fun TextAlign?.toStyle(): Int {
return when (this) {
TextAlign.Left -> TEXT_ALIGNMENT_TEXT_START
TextAlign.Right -> TEXT_ALIGNMENT_TEXT_END
TextAlign.Center -> TEXT_ALIGNMENT_CENTER
TextAlign.Start -> TEXT_ALIGNMENT_TEXT_START
TextAlign.End -> TEXT_ALIGNMENT_TEXT_END
else -> -1
}
}
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