Jetpack Compose: Custom TextField design

Question

In general, most components in Jetpack Compose seem to be very easy to customize.

However, the same cannot be said for the TextField. For example, say that I wanted to make something like this:

One would think that simply wrapping the BaseTextField would work. However, it appears that there has been a bug in the BaseTextField component, and I have opened an issue. This bug will not permit the user to focus the text field after focusing-away from it once already, until the component is re-rendered.

Citing this, I attempted to customize the OutlinedTextField and TextField components, but am not able to customize them to look like the image above. Were it not for the fact that the cursor color uses the activeColor property, I could make it work.

What would be a proper work-around to create a usable text field that looks like the above?

Answer 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()
    )

Answer 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
        )
    }