Develop Reference

How do I make a disabled compose OutlinedTextField look like its enabled?

I have a compose OutlinedTextField which shouldn't be manually editable but filled using input from something that happens on clicking the text field. But setting the field as readOnly=true makes the clickable modifier not work. So a workaround I found is to set it as enabled=false which lets clickable work.
OutlinedTextField(
value = text,
onValueChange = { text = it},
enabled = false,
modifier = Modifier.clickable { text= "Clicked"}
)
How can I make this look as if its enabled based on whatever theme is being followed without setting a fixed color?

You can use the TextFieldDefaults.outlinedTextFieldColors applying in the disabled colors the same value of the enabled colors without using hardcoded values:
OutlinedTextField(
//...
enabled = false,
colors = TextFieldDefaults.outlinedTextFieldColors(
disabledTextColor = LocalContentColor.current.copy(LocalContentAlpha.current),
backgroundColor = Color.Transparent,
disabledBorderColor = MaterialTheme.colors.onSurface.copy(alpha = ContentAlpha.disabled),
disabledLabelColor = MaterialTheme.colors.onSurface.copy(ContentAlpha.medium),
)
)

Showing a text field in the app bar in Jetpack Compose with Material3

Many Android apps feature a search box in the app bar / toolbar, that looks somewhat like this screenshot:
How do I recreate something similar in Jetpack Compose + Material3? I would like the text field to have these features:
support showing a hint when the content string is empty (e.g. "Type your search...")
auto-focus on the first composition, so that the keyboard is opened
put the cursor at the end of the content string on the first composition
I tried to reproduce the same behavior in Jetpack Compose + Material3 by putting a TextField in the title of a CenterAlignedTopAppBar but the result does not look good. The text field uses the whole height of the app bar and has a grey background, and both of these things look odd.

I came up with a AppBarTextField after some engineering, see the code below. I had to use the lower-level BasicTextField since the normal TextField is not customizable enough. The code having to do with theming and color was copied directly from TextField's implementation, so that the theme's customizations apply normally to the components of the text field.
The parameters the AppBarTextField composable accepts are:
value: the content string to show in the text field
onValueChange: new values are passed here (remember to update value!)
hint: the hint to show when the text field is empty
modifier, keyboardOptions and keyboardActions: they are passed directly to BasicTextField and they behave the same as they would in a normal TextField. If you need to customize other TextField parameters just add them to the function signature and then pass them to BasicTextField.
The requested features are implemented:
the focus acquisition was achieved with a SideEffect, so that it would only happen on the first composition
putting the cursor at the end on the first composition required using a TextFieldValue
the strange-looking background is not present anymore, since no .background() modifier is present (while it is in the normal TextField)
the hint was added using by passing a placeholder to TextFieldDecorationBox in the decorationBox parameter (note that this was also possible with TextField)
TextFieldDecorationBox's padding is also now only 4dp. Padding was added here (and not with a modifier on BasicTextField) since otherwise the bottom line indicator (which is, instead, displayed using the .indicatorLine() modifier) would not be shown correctly.
#OptIn(ExperimentalMaterial3Api::class)
#Composable
fun AppBarTextField(
value: String,
onValueChange: (String) -> Unit,
hint: String,
modifier: Modifier = Modifier,
keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
keyboardActions: KeyboardActions = KeyboardActions.Default,
) {
val interactionSource = remember { MutableInteractionSource() }
val textStyle = LocalTextStyle.current
// make sure there is no background color in the decoration box
val colors = TextFieldDefaults.textFieldColors(containerColor = Color.Unspecified)
// If color is not provided via the text style, use content color as a default
val textColor = textStyle.color.takeOrElse {
MaterialTheme.colorScheme.onSurface
}
val mergedTextStyle = textStyle.merge(TextStyle(color = textColor, lineHeight = 50.sp))
// request focus when this composable is first initialized
val focusRequester = FocusRequester()
SideEffect {
focusRequester.requestFocus()
}
// set the correct cursor position when this composable is first initialized
var textFieldValue by remember {
mutableStateOf(TextFieldValue(value, TextRange(value.length)))
}
textFieldValue = textFieldValue.copy(text = value) // make sure to keep the value updated
CompositionLocalProvider(
LocalTextSelectionColors provides LocalTextSelectionColors.current
) {
BasicTextField(
value = textFieldValue,
onValueChange = {
textFieldValue = it
// remove newlines to avoid strange layout issues, and also because singleLine=true
onValueChange(it.text.replace("\n", ""))
},
modifier = modifier
.fillMaxWidth()
.heightIn(32.dp)
.indicatorLine(
enabled = true,
isError = false,
interactionSource = interactionSource,
colors = colors
)
.focusRequester(focusRequester),
textStyle = mergedTextStyle,
cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
keyboardOptions = keyboardOptions,
keyboardActions = keyboardActions,
interactionSource = interactionSource,
singleLine = true,
decorationBox = { innerTextField ->
// places text field with placeholder and appropriate bottom padding
TextFieldDefaults.TextFieldDecorationBox(
value = value,
visualTransformation = VisualTransformation.None,
innerTextField = innerTextField,
placeholder = { Text(text = hint) },
singleLine = true,
enabled = true,
isError = false,
interactionSource = interactionSource,
colors = colors,
contentPadding = PaddingValues(bottom = 4.dp)
)
}
)
}
}
Here is an example usage:
var value by rememberSaveable { mutableStateOf("initial content") }
CenterAlignedTopAppBar(
title = {
AppBarTextField(
value = value,
onValueChange = { newValue -> value = newValue },
hint = "A hint..."
)
},
navigationIcon = /* the back icon */,
actions = /* the search icon */
)

How to hide TextFieldCursorHandle in Jetpack compose for TextField/BasicTextField?

The solution I have so far is to use a Transparent Color for the cursor.
I am looking for a better way to hide it if there is any.
cursorBrush = SolidColor(Transparent)
TextField should be focused, the keyboard should be open and the user should be able to type input.
The problem with this is I can still see the TextFieldCursorHandle after entering text.

In the BasicTextField you can hide the cursor using cursorBrush = SolidColor(Unspecified).
In the TextFieldyou can use the attribute colors = TextFieldDefaults.textFieldColors(cursorColor = Color.Unspecified)
The TextFieldCursorHandle and the selected text use the color provided by LocalTextSelectionColors.current
You override this color defining a custom TextSelectionColors:
val customTextSelectionColors = TextSelectionColors(
handleColor = Color.Transparent,
backgroundColor = Color.Transparent
)
CompositionLocalProvider(LocalTextSelectionColors provides customTextSelectionColors) {
BasicTextField(
value = text,
onValueChange = {text = it},
cursorBrush = SolidColor(Unspecified)
)
TextField(
value = text,
onValueChange = {text = it},
colors = TextFieldDefaults.textFieldColors(cursorColor = Color.Unspecified)
)
}

How do I get the selected text from SelectionContainer

I need to get the selected text from the Text component. I tried using the SelectionContainer, but it does not have an onSelectionChange callback or something similar.
Edit: I have to highlight the text the user selected
Edit 2: I have asked in the issue tracker, and it's not possible to do that yet. https://issuetracker.google.com/issues/195441731

If you are not forced to use Text() ...
An easy way is to use Composable TextField() and change readOnly to true
because you need a TextFieldValue argument to get selected text
for example if i want that selected text in custom TextField , my code will be look like this:
#Composable fun TextWithSelectedText(
text:String = "This is a plain text",
selectedText:MutableState<String>){
var textInput by remember{ mutableStateOf(TextFieldValue(text))}
TextField(
value = textInput,
onValueChange = { newValue ->
textInput = newValue
selectedText.value = textInput.getSelectedText().text
} ,
readOnly = true ,
colors = TextFieldDefaults.textFieldColors(
backgroundColor = Color.White , // your background color
focusedIndicatorColor = Color.Transparent ,
unfocusedIndicatorColor = Color.Transparent
)
)
}

Change the radius of the border for OutlinedTextField

Is it possible to change the radius of the border of an OutlinedTextField. I want to achieve something like this
I can not use Modifier.border because it just draws border above the label. Like this
And for OutlinedTextField there is no shape parameter like it is in TextField.
And If I use simple TextField I can't have label that is drawing in the top border line. The label is drawing within the TextField.

You can use the shape parameter to customize the shape of the border:
OutlinedTextField(
value = text,
onValueChange = {
text = it
},
shape = RoundedCornerShape(12.dp)
)

You can use shape for this. please refer below code
OutlinedTextField(
value = email, onValueChange = {
email = it
},
label = {
Text(text = "Round corner", color = PrimaryColor)
},
shape = RoundedCornerShape(25.dp),
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 20.dp)
.padding(top = 10.dp),
colors = TextFieldDefaults.outlinedTextFieldColors(
unfocusedBorderColor = PrimaryColor,
textColor = PrimaryColor),

See the recommended way of creating such custom Composables, is to copy the original Composable's implementation and modify it to suit your needs.
Shortcut: Just type Button then Ctrl + Click on it (in Android Studio). This will take you to the implementation. It is a very simple and small one so just copy it. Internally, button uses a surface to contain the elements in a rowscope, which does have a shape parameter, or you can use Modifier.clip() on it. Try it out.