Jetpack Compose: Custom TextField design

Solution 1:

You can use the TextField:

• removing the label with label = null
• applying custom color with the TextFieldDefaults.textFieldColors parameter to hide the indicator.
• adding in the onValueChange a function to fix the max number of characters as described here

Finally use a Column to add 2 Text composables to complete the external label and counter text.

Something like:

var text by remember { mutableStateOf("") }
val maxChar = 5

Column(){
    //External label
    Text(
        text = "Label",
        modifier = Modifier.fillMaxWidth(),
        textAlign = TextAlign.Start,
        color = Blue
    )

    TextField(
        value = text,
        onValueChange = {
            if (it.length <= maxChar) text = it
        },
        modifier = Modifier
            .fillMaxWidth()
            .padding(vertical = 4.dp),
        shape = RoundedCornerShape(8.dp),
        trailingIcon = {
            Icon(Icons.Filled.Add, "", tint = Blue)
        },
        colors = TextFieldDefaults.textFieldColors(
            backgroundColor = ....,
            focusedIndicatorColor =  Color.Transparent, //hide the indicator
            unfocusedIndicatorColor = .....)
    )
    //counter message
    Text(
        text = "${text.length} / $maxChar",
        textAlign = TextAlign.End,
        color = Blue,
        style = MaterialTheme.typography.caption, //use the caption text style
        modifier = Modifier.fillMaxWidth()
    )

Solution 2:

By this exemple you can learn a lot. With 1.0.0 you can do like this:

Column {
        var textState by remember { mutableStateOf("") }
        val maxLength = 110
        val lightBlue = Color(0xffd8e6ff)
        val blue = Color(0xff76a9ff)
        Text(
            text = "Caption",
            modifier = Modifier
                .fillMaxWidth()
                .padding(bottom = 4.dp),
            textAlign = TextAlign.Start,
            color = blue
        )
        TextField(
            modifier = Modifier.fillMaxWidth(),
            value = textState,
            colors = TextFieldDefaults.textFieldColors(
                backgroundColor = lightBlue,
                cursorColor = Color.Black,
                disabledLabelColor = lightBlue,
                focusedIndicatorColor = Color.Transparent,
                unfocusedIndicatorColor = Color.Transparent
            ),
            onValueChange = {
                if (it.length <= maxLength) textState = it
            },
            shape = RoundedCornerShape(8.dp),
            singleLine = true,
            trailingIcon = {
                if (textState.isNotEmpty()) {
                    IconButton(onClick = { textState = "" }) {
                        Icon(
                            imageVector = Icons.Outlined.Close,
                            contentDescription = null
                        )
                    }
                }
            }
        )
        Text(
            text = "${textState.length} / $maxLength",
            modifier = Modifier
                .fillMaxWidth()
                .padding(top = 4.dp),
            textAlign = TextAlign.End,
            color = blue
        )
    }