Develop Reference

JetPack Compose Button with drawable

How can we achieve this in jetpack compose
I'm doing something like this
Button(
elevation = ButtonDefaults.elevation(
defaultElevation = 0.dp,
pressedElevation = 8.dp,
disabledElevation = 0.dp
),
onClick = { onClick },
shape = RoundedCornerShape(28.dp),
modifier = modifier
.fillMaxWidth()
.shadow(0.dp),
contentPadding = PaddingValues(15.dp),
colors = ButtonDefaults.buttonColors(backgroundColor = Color.White),
border = BorderStroke(1.dp, Color.Grey)
) {
Box(modifier = modifier.fillMaxWidth(),
contentAlignment = Alignment.Center) {
Icon(
imageVector = imageVector,
modifier = Modifier
.size(18.dp),
contentDescription = "drawable icons",
tint = Color.Unspecified
)
Spacer(modifier = Modifier.width(10.dp))
Text(
text = buttonText,
color = Color.Black,
textAlign = TextAlign.Center
)
}
}
So as you can see the Google logo is just left of the text I need it at the start of the box so how can I do this.

You can use align(Alignment.CenterStart) on the Icon's Modifier parameter to center the icon around the start of the Box Composable. This alignment will have priority over the Box's alignment parameter.
You can also delete the Spacer composable because the Box layout children are stacked one on top of the other in the composition order. So the Spacer composable is basically laying below the Text composable in the center.
If you want some space between the Icon and the Text, you could use some padding around the Icon instead.
Try this (It worked for me) :
Box(modifier = modifier.fillMaxWidth(),
contentAlignment = Alignment.Center) {
Icon(
imageVector = imageVector,
modifier = Modifier
.size(18.dp)
.align(Alignment.CenterStart),
contentDescription = "drawable icons",
tint = Color.Unspecified
)
Text(
text = buttonText,
color = Color.Black,
textAlign = TextAlign.Center
)
}

#Composable
fun GoogleButton(
modifier: Modifier = Modifier,
imageVector: ImageVector,
buttonText: String,
onClick: (isEnabled: Boolean) -> Unit = {},
enable: Boolean = true,
backgroundColor: Color,
fontColor: Color,
) {
Button(
onClick = { onClick(enable) },
modifier = modifier
.fillMaxWidth()
.shadow(0.dp)
.noInteractionClickable(enabled = false) { onClick(enable) },
elevation = ButtonDefaults.elevation(
defaultElevation = 0.dp,
pressedElevation = 0.dp,
hoveredElevation = 0.dp,
focusedElevation = 0.dp
),
shape = RoundedCornerShape(28.dp),
contentPadding = PaddingValues(15.dp),
colors = ButtonDefaults.buttonColors(
backgroundColor = backgroundColor,
contentColor = fontColor
),
border = BorderStroke(1.dp, MaterialTheme.colors.getButtonBorderStroke)
) {
Box(
modifier = Modifier
.fillMaxWidth(),
contentAlignment = Alignment.Center
) {
Row(
modifier = Modifier
.fillMaxWidth()
.align(Alignment.CenterStart)
) {
Spacer(modifier = Modifier.width(4.dp))
Icon(
imageVector = imageVector,
modifier = Modifier
.size(18.dp),
contentDescription = "drawable_icons",
tint = Color.Unspecified
)
}
Text(
modifier = Modifier.align(Alignment.Center),
text = buttonText,
color = MaterialTheme.colors.loginButtonTextColor,
textAlign = TextAlign.Center,
fontSize = 16.sp,
fontFamily = FontFamily(
Font(
R.font.roboto_medium
)
)
)
}
}
}

As suggested in other answers you can wrap the content with a Box.
As alternative you can simply use the RowScope of the Button without any container.
Just apply a weight(1f) modifier to the Text and an offset(x=- iconWidth/2).
Something like:
Button(
//....
) {
Icon(
imageVector = imageVector,
modifier = Modifier.size(iconWidth),
contentDescription = "drawable icons",
tint = Color.Unspecified
)
Text(
text = "Button",
color = Color.Black,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(1f)
.offset(x= -iconWidth/2) //default icon width = 24.dp
)
}
If you want to use a Box, remove the contentAlignment = Alignment.Center in the Box and use:
Box(modifier = Modifier.fillMaxWidth()) {
Icon( /* ..... */ )
Text(
modifier = Modifier.fillMaxWidth(),
text = "buttonText",
textAlign = TextAlign.Center
)
}

Box doesn't provide bounds, so for longer texts, it causes overlapping. Row works better for me. Also, you can use Spacer here which is not possible for Box. In my case, I have used spacedBy as a replacement for Spacer:
Row(
modifier = Modifier.fillMaxWidth(),
horizontalArrangement = Arrangement.spacedBy(16.dp),
verticalAlignment = Alignment.CenterVertically
) {
Icon(
painter,
contentDescription = null
)
Box(
modifier = Modifier.weight(1F),
contentAlignment = Alignment.Center
) {
Text(buttonText)
}
}

Box(contentAlignment = Center){
Icon(Modifier.align(CenterStart))
Text()
}

Constraining a Composable to the bottom of a Column

Me and my team are new to Compose and we're trying to build a TopUp screen for a client. The screen consists of a Column that contains some Padding (in the form of a Composable) for the TopAppBar, two Card composables, a button, then a footer composable which I need to constraint to the bottom of the column, and finally, some padding (again in the form of a composable) to give us some space between the content and the bottom navbar.
Right now we're using a spacer with a fixed dp value but obviously, this won't scale so that it is constrained to the bottom on all devices. What would be the best way to go about achieving such a look?
screen composable:
#OptIn(ExperimentalComposeUiApi::class)
#Composable
fun TopUpScreen() {
Column(
horizontalAlignment = Alignment.CenterHorizontally, modifier = Modifier
.fillMaxWidth()
.fillMaxHeight()
.padding(horizontal = 16.dp)
) {
val viewModel = getViewModel<TopUpViewModel>()
TopBarPadding()
TopUpCardView(title = stringResource(id = R.string.choose_topup_amount)) {
var selectedCardIndex by remember { mutableStateOf(-1) }
Row(
horizontalArrangement = Arrangement.SpaceAround,
modifier = Modifier
.fillMaxWidth()
) {
Card(
shape = RoundedCornerShape(11.dp),
elevation = if (selectedCardIndex == 0) 1.dp else 0.dp,
backgroundColor = if (selectedCardIndex == 0) colorResource(id = R.color.bottom_modal_drawer_background) else colorResource(
id = R.color.more_screen_item_background
),
modifier = Modifier
.width(71.dp)
.height(56.dp)
.shadow(
if (selectedCardIndex == 0) 8.dp else 0.dp,
shape = RoundedCornerShape(11.dp)
)
.clickable {
selectedCardIndex = 0
viewModel.topUpAmount = 20.0
}
) {
Text(
"€20",
fontSize = 16.sp,
fontWeight = FontWeight.Normal,
textAlign = TextAlign.Center,
modifier = Modifier.wrapContentHeight()
)
}
Card(
shape = RoundedCornerShape(11.dp),
elevation = if (selectedCardIndex == 1) 1.dp else 0.dp,
backgroundColor = if (selectedCardIndex == 1) colorResource(id = R.color.bottom_modal_drawer_background) else colorResource(
id = R.color.more_screen_item_background
),
modifier = Modifier
.width(71.dp)
.height(56.dp)
.shadow(
if (selectedCardIndex == 1) 8.dp else 0.dp,
shape = RoundedCornerShape(11.dp)
)
.clickable {
selectedCardIndex = 1
viewModel.topUpAmount = 40.0
}
) {
Text(
"€40",
fontSize = 16.sp,
fontWeight = FontWeight.Normal,
textAlign = TextAlign.Center,
modifier = Modifier.wrapContentHeight()
)
}
Card(
shape = RoundedCornerShape(11.dp),
elevation = if (selectedCardIndex == 2) 1.dp else 0.dp,
backgroundColor = if (selectedCardIndex == 2) colorResource(id = R.color.bottom_modal_drawer_background) else colorResource(
id = R.color.more_screen_item_background
),
modifier = Modifier
.width(71.dp)
.height(56.dp)
.shadow(
if (selectedCardIndex == 2) 8.dp else 0.dp,
shape = RoundedCornerShape(11.dp)
)
.clickable {
selectedCardIndex = 2
viewModel.topUpAmount = 70.0
}
) {
Text(
"€70",
fontSize = 16.sp,
fontWeight = FontWeight.Normal,
textAlign = TextAlign.Center,
modifier = Modifier.wrapContentHeight()
)
}
Card(
shape = RoundedCornerShape(11.dp),
elevation = if (selectedCardIndex == 3) 1.dp else 0.dp,
backgroundColor = if (selectedCardIndex == 3) colorResource(id = R.color.bottom_modal_drawer_background) else colorResource(
id = R.color.more_screen_item_background
),
modifier = Modifier
.width(71.dp)
.height(56.dp)
.shadow(
if (selectedCardIndex == 3) 8.dp else 0.dp,
shape = RoundedCornerShape(11.dp)
)
.clickable {
selectedCardIndex = 3
viewModel.topUpAmount = 100.0
}
) {
Text(
"€100",
fontSize = 16.sp,
fontWeight = FontWeight.Normal,
textAlign = TextAlign.Center,
modifier = Modifier.wrapContentHeight()
)
}
}
}
Spacer(modifier = Modifier.padding(16.dp))
val focusManager = LocalFocusManager.current
val keyboardController = LocalSoftwareKeyboardController.current
TopUpCardView(title = stringResource(id = R.string.enter_custom_topup_amount)) {
var customAmountTxt by remember { mutableStateOf(TextFieldValue()) }
TextField(
value = customAmountTxt,
onValueChange = {
customAmountTxt = it
},
maxLines = 1,
singleLine = true,
leadingIcon = {
Icon(
painter = painterResource(id = R.drawable.ic_euro),
contentDescription = stringResource(
R.string.euro_icon_desc
),
modifier = Modifier.padding(
start = 16.dp,
end = 16.dp,
top = 12.dp,
bottom = 12.dp
)
)
},
keyboardOptions = KeyboardOptions(
keyboardType = KeyboardType.Number,
imeAction = ImeAction.Done
),
keyboardActions = KeyboardActions(onDone = {
focusManager.clearFocus()
keyboardController?.hide()
}),
shape = RoundedCornerShape(6.dp),
colors = TextFieldDefaults.textFieldColors(
backgroundColor = colorResource(id = R.color.white),
textColor = colorResource(id = R.color.black),
focusedIndicatorColor = colorResource(id = R.color.white),
unfocusedIndicatorColor = colorResource(id = R.color.white),
disabledIndicatorColor = colorResource(id = R.color.white),
cursorColor = colorResource(id = R.color.black)
),
textStyle = TextStyle(
color = Color.Black,
fontSize = 16.sp,
fontWeight = FontWeight.Normal,
textAlign = TextAlign.Start
),
modifier = Modifier
.height(50.dp)
.fillMaxWidth()
.shadow(8.dp, shape = RoundedCornerShape(6.dp))
)
}
Spacer(modifier = Modifier.padding(32.fixedDp()))
val context = LocalContext.current //todo:sp remove when you remove the toast
MyButton(
text = stringResource(id = R.string.continue_text),
buttonType = MyButtonType.PRIMARY,
onClick = {
Toast.makeText(context, "[TODO] Navigate to card screen", Toast.LENGTH_SHORT).show()
})
//todo:sp replace the spacer implementation with something that will constraint the
// footer to the bottom as it should
Spacer(modifier = Modifier.height(130.dp))
AcceptedCardsFooter()
BottomBarPadding()
}
}
TopUpCardView:
#Composable
fun TopUpCardView(
title: String,
modifier: Modifier = Modifier,
mainBody: #Composable () -> Unit
) {
Card(
shape = RoundedCornerShape(13.dp),
elevation = 10.dp,
modifier = modifier
.fillMaxWidth()
.height(131.dp)
) {
Column(modifier = Modifier.padding(vertical = 20.dp, horizontal = 16.dp)) {
Text(
text = title,
fontSize = 16.sp,
fontWeight = FontWeight.Bold,
textAlign = TextAlign.Start
)
Spacer(modifier = Modifier.padding(9.dp))
mainBody()
}
}
}
Footer:
#Composable
fun AcceptedCardsFooter(isTransparent: Boolean = false) {
Row(modifier = Modifier
.fillMaxWidth()
.clip(RoundedCornerShape(10.dp))
.background(
if (isTransparent) {
Color.Transparent
} else {
colorResource(id = R.color.registration_note_background)
}
)
.padding(bottom = 12.dp, top = 12.dp, start = 16.dp, end = 14.dp),
horizontalArrangement = Arrangement.SpaceBetween,
verticalAlignment = Alignment.CenterVertically
) {
Text(text = LocalContext.current.getString(R.string.accepted_cards),
fontSize = 12.sp,
color = colorResource(id = R.color.Black_100)
)
Row(verticalAlignment = Alignment.CenterVertically) {
Image(painter = painterResource(id = R.drawable.visa), contentDescription = "")
Spacer(modifier = Modifier.padding(17.fixedDp()))
Image(painter = painterResource(id = R.drawable.mastercard), contentDescription = "")
Spacer(modifier = Modifier.padding(10.fixedDp()))
Image(painter = painterResource(id = R.drawable.american_express), contentDescription = "")
}
}
}

The easiest way is to use weight modifier:
Spacer(modifier = Modifier.height(130.dp).weight(1f))

Add bottom padding to first Column for give space between content and bottombar. After that give weight to second Column for make footer constraint to the bottom.
For example,
Column(
modifier = Modifier.fillMaxSize().padding(bottom = 15.dp, start = 16.dp, end = 16.dp )
) {
Column(
modifier = Modifier.fillMaxSize().weight(1f).padding(horizontal = 16.dp)
) {
// top bar
// two cards
// button
}
// add footer here
}

I would use a ConstraintLayout and wrap the view you need to always be at the bottom of the screen.
ConstraintLayout {
// Create references for the composables to constrain
val id_of_your_footer = createRefs()
YourFooterComposable(
modifier = Modifier.constrainAs(id_of_your_footer) {
bottom.linkTo(parent.bottom)
}
)
}
As long as the parent is the root view, the Footer will be constrained to stay at the bottom of the screen.
Alternatively, you can use a scaffold that has these constraints set automatically:
Scaffold(topBar={//place a top bar composable here},
content={//all your content composables here},
bottomBar={//your footer composable here})

How can I display vertical divider in Row?

I want to add a vertical line to separate my 2 buttons but when I do this the line goes all the way to the bottom of the screen and I lose the Data content. But I want the line to go just after the button cap (they are not really buttons, they are text boxes).
How can I make the vertical line go to where I mark with the red line?
Scaffold(
topBar = {
TopAppBar( /* Config*/ )
},
content = {
Box(modifier = Modifier.fillMaxSize()) {
Column {
OptionButtons()
Divider()
Data( /* Component with a list with data */ )
}
}
}
)
#Composable
fun OptionButtons() {
Row {
Text(
text = "Option1",
color = OptionButtonText,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
.clickable { }
)
Divide()
Text(
text = "Option2",
color = OptionButtonText,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
.clickable { }
)
}
}

Just add this modifier = Modifier.height(IntrinsicSize.Min) in the Row to get minimum space for Row:
#Composable
fun OptionButtons() {
Row(
modifier = Modifier
.height(IntrinsicSize.Min),
horizontalArrangement = Arrangement.SpaceAround
) {
Text(
text = "Option1",
color = Color.Red,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
.clickable { }
)
Divider(
modifier = Modifier
.width(1.dp)
.fillMaxHeight()
)
Text(
text = "Option2",
color = Color.Red,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
.clickable { }
)
}
}

You have your text divider and text within a Row{ } block.
What you need to do is to structure it like this
Column{
Row{
Text()
Divider()
Text()
}
Divider()
Row{
Text()
Divider()
Text()
}
}
#Composable
fun OptionButtons() {
Column {
Row {
Text(
text = "Option1",
color = OptionButtonText,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
.clickable { },
)
Divider(
modifier = Modifier
.fillMaxHeight()
.width(1.dp)
)
Text(
text = "Option2",
color = OptionButtonText,
textAlign = TextAlign.Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
.clickable { },
)
}
Divider(color = Color.Red, thickness = 1.dp)
Row {
Text(
text = ""//whatever value you want to populate with
textAlign = TextAlign . Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
)
Divider(
modifier = Modifier
.fillMaxHeight()
.width(1.dp)
)
Text(
text = ""//whatever value you want to populate with
textAlign = TextAlign . Center,
modifier = Modifier
.weight(0.50f)
.padding(
PaddingValues(
start = 20.dp,
top = 12.dp,
end = 20.dp,
bottom = 12.dp
)
)
)
}
}
}
}

Transparent background in Outlined Button in Jetpack Compose

I want to create button where I have only text and icon and all background and borders are transparent. I create something like that:
OutlinedButton(
colors = ButtonDefaults.buttonColors(backgroundColor = Color.Transparent),
border = BorderStroke(0.dp, Color.Transparent),
modifier = modifier,
onClick = onClick
) {
icon?.invoke()
Text(
text = value,
fontSize = 12.sp
)
}
and everything is ok, but I lost default colors(should be blue, and I have black icon and text). How can I remove all background and borders from button but still have theme colors?

Could you try this?
#Composable
fun TiledButton(
onClick: () -> Unit,
#DrawableRes backgroundDrawableId: Int,
modifier: Modifier = Modifier,
enabled: Boolean = true,
shape: Shape = MaterialTheme.shapes.small,
border: BorderStroke? = null,
contentColor: Color = MaterialTheme.colors.primary,
contentPadding: PaddingValues = ButtonDefaults.ContentPadding,
content: #Composable RowScope.() -> Unit
) {
Button(
onClick = onClick,
contentPadding = PaddingValues(0.dp),
enabled = enabled,
shape = shape,
border = border,
elevation = null,
colors = ButtonDefaults.buttonColors(
backgroundColor = Color.Transparent,
contentColor = contentColor,
disabledBackgroundColor = Color.Transparent,
disabledContentColor = contentColor.copy(alpha = ContentAlpha.disabled),
),
modifier = modifier
) {
Box(
contentAlignment = Alignment.Center,
) {
TileAndroidImage(
drawableId = backgroundDrawableId,
contentDescription = "...",
modifier = Modifier.matchParentSize()
)
Row(
horizontalArrangement = Arrangement.Center,
verticalAlignment = Alignment.CenterVertically,
modifier = Modifier.padding(contentPadding),
content = content,
)
}
}
}
TiledButton(
onClick = { },
backgroundDrawableId = R.drawable.tile,
border = BorderStroke(1.dp, Color.Blue),
) {
Text("Button")
}

Just use a TextButton instead of a OutlinedButton:
TextButton(
onClick = { }
) {
Icon(Icons.Default.Add,"")
Text(
text = value,
fontSize = 12.sp
)
}
If you want to use a OutlinedButton just use ButtonDefaults.outlinedButtonColors instead of ButtonDefaults.buttonColors:
OutlinedButton(
colors = ButtonDefaults.outlinedButtonColors(backgroundColor = Color.Transparent),
border = BorderStroke(0.dp, Color.Transparent),
modifier = modifier,
onClick = onClick
) {
Icon(Icons.Default.Add,"")
Text(
text = value,
fontSize = 12.sp
)
}

Jetpack Compose Constraint Layout constrains not linking

I'm using constrainAs with Jetpack Compose to constrain a list of wifi options to the top of the parent and then to the bottom of a text view. As seen from the photo my list isn't being constrained to the top of the parent or to the textview below it, and it is even being pushed off the screen upwards?
For reference 'list' is the list of wifi options, and 'text1' is the textview that starts with "Select your wifi"
#Composable
fun ScanWifiScreen(wifiList: List<WifiOption>, onClick: (WifiOption) -> Unit) {
ConstraintLayout(
modifier = Modifier
.fillMaxSize()
.background(colorResource(id = R.color.background))
) {
val (list, text1, text2, progressIndicator) = createRefs()
WifiList(
wifiOptions = wifiList,
onClick = onClick,
modifier = Modifier
.constrainAs(list) {
top.linkTo(parent.top, margin = 8.dp)
bottom.linkTo(text1.top)
start.linkTo(parent.start)
end.linkTo(parent.end)
}
.background(colorResource(id = R.color.background))
.fillMaxHeight())
Text(
text = stringResource(id = R.string.select_wifi),
modifier = Modifier
.wrapContentSize()
.padding(bottom = 16.dp)
.constrainAs(text1) {
bottom.linkTo(text2.top)
start.linkTo(parent.start)
end.linkTo(parent.end)
},
style = TextStyle(
fontFamily = FontFamily(Font(R.font.quicksand_regular)),
fontSize = 20.sp,
color = colorResource(id = R.color.main_text),
letterSpacing = 0.22.sp,
textAlign = TextAlign.Center,
lineHeight = 32.sp
)
)
Text(
text = stringResource(id = R.string.cant_see_network),
modifier = Modifier
.wrapContentSize()
.padding(bottom = 32.dp)
.constrainAs(text2) {
bottom.linkTo(progressIndicator.top)
start.linkTo(parent.start)
end.linkTo(parent.end)
},
style = TextStyle(
fontFamily = FontFamily(Font(R.font.quicksand_regular)),
fontSize = 16.sp,
color = colorResource(id = R.color.sub_text),
letterSpacing = 0.18.sp,
textAlign = TextAlign.Center,
lineHeight = 24.sp
)
)
ProgressIndicator2(
progression = 3,
modifier = Modifier.constrainAs(progressIndicator) {
bottom.linkTo(parent.bottom)
start.linkTo(parent.start)
end.linkTo(parent.end)
})
}
}

In your List remove the .fillMaxHeight() modifier and add the constraint height = Dimension.fillToConstraints
WifiList(
//....
modifier = Modifier
.constrainAs(list) {
top.linkTo(parent.top, margin = 8.dp)
bottom.linkTo(text1.top)
start.linkTo(parent.start)
end.linkTo(parent.end)
height = Dimension.fillToConstraints
}
)