Dialogs for time pickers

Time pickers often appear in dialogs. You can use a relatively generic and minimal implementation of a dialog, or you can implement a custom dialog with more flexibility.

For more information on dialogs in general, including how to use the time picker state, see the Time pickers guide.

Basic example

The most straightforward way to create a dialog for your time picker is to create a composable that implements AlertDialog. The following snippet provides an example of a relatively minimal dialog using this approach:

@Composable
fun DialWithDialogExample(
    onConfirm: (TimePickerState) -> Unit,
    onDismiss: () -> Unit,
) {
    val currentTime = Calendar.getInstance()

    val timePickerState = rememberTimePickerState(
        initialHour = currentTime.get(Calendar.HOUR_OF_DAY),
        initialMinute = currentTime.get(Calendar.MINUTE),
        is24Hour = true,
    )

    TimePickerDialog(
        onDismiss = { onDismiss() },
        onConfirm = { onConfirm(timePickerState) }
    ) {
        TimePicker(
            state = timePickerState,
        )
    }
}

@Composable
fun TimePickerDialog(
    onDismiss: () -> Unit,
    onConfirm: () -> Unit,
    content: @Composable () -> Unit
) {
    AlertDialog(
        onDismissRequest = onDismiss,
        dismissButton = {
            TextButton(onClick = { onDismiss() }) {
                Text("Dismiss")
            }
        },
        confirmButton = {
            TextButton(onClick = { onConfirm() }) {
                Text("OK")
            }
        },
        text = { content() }
    )
}
TimePickers.kt

Note the key points in this snippet:

  1. The DialWithDialogExample composable wraps TimePicker in a dialog.
  2. TimePickerDialog is a custom composable that creates an AlertDialog with the following parameters:
    • onDismiss: A function called when the user dismisses the dialog (via the dismiss button or navigation back).
    • onConfirm: A function called when the user clicks the "OK" button.
    • content: A composable that displays the time picker within the dialog.
  3. The AlertDialog includes:
    • A dismiss button labeled "Dismiss".
    • A confirm button labeled "OK".
    • The time picker content passed as the text parameter.
  4. The DialWithDialogExample initializes the TimePickerState with the current time and passes it to both the TimePicker and the onConfirm function.
A time picker in an AlertDialog that implements a title, a mode toggle, and dismiss and confirm buttons.
Figure 1. A time picker in an AlertDialog.

Advanced Example

This snippet demonstrates an advanced implementation of a customizable time picker dialog in Jetpack Compose.

@Composable
fun AdvancedTimePickerExample(
    onConfirm: (TimePickerState) -> Unit,
    onDismiss: () -> Unit,
) {

    val currentTime = Calendar.getInstance()

    val timePickerState = rememberTimePickerState(
        initialHour = currentTime.get(Calendar.HOUR_OF_DAY),
        initialMinute = currentTime.get(Calendar.MINUTE),
        is24Hour = true,
    )

    /** Determines whether the time picker is dial or input */
    var showDial by remember { mutableStateOf(true) }

    /** The icon used for the icon button that switches from dial to input */
    val toggleIcon = if (showDial) {
        Icons.Filled.EditCalendar
    } else {
        Icons.Filled.AccessTime
    }

    AdvancedTimePickerDialog(
        onDismiss = { onDismiss() },
        onConfirm = { onConfirm(timePickerState) },
        toggle = {
            IconButton(onClick = { showDial = !showDial }) {
                Icon(
                    imageVector = toggleIcon,
                    contentDescription = "Time picker type toggle",
                )
            }
        },
    ) {
        if (showDial) {
            TimePicker(
                state = timePickerState,
            )
        } else {
            TimeInput(
                state = timePickerState,
            )
        }
    }
}

@Composable
fun AdvancedTimePickerDialog(
    title: String = "Select Time",
    onDismiss: () -> Unit,
    onConfirm: () -> Unit,
    toggle: @Composable () -> Unit = {},
    content: @Composable () -> Unit,
) {
    Dialog(
        onDismissRequest = onDismiss,
        properties = DialogProperties(usePlatformDefaultWidth = false),
    ) {
        Surface(
            shape = MaterialTheme.shapes.extraLarge,
            tonalElevation = 6.dp,
            modifier =
            Modifier
                .width(IntrinsicSize.Min)
                .height(IntrinsicSize.Min)
                .background(
                    shape = MaterialTheme.shapes.extraLarge,
                    color = MaterialTheme.colorScheme.surface
                ),
        ) {
            Column(
                modifier = Modifier.padding(24.dp),
                horizontalAlignment = Alignment.CenterHorizontally
            ) {
                Text(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(bottom = 20.dp),
                    text = title,
                    style = MaterialTheme.typography.labelMedium
                )
                content()
                Row(
                    modifier = Modifier
                        .height(40.dp)
                        .fillMaxWidth()
                ) {
                    toggle()
                    Spacer(modifier = Modifier.weight(1f))
                    TextButton(onClick = onDismiss) { Text("Cancel") }
                    TextButton(onClick = onConfirm) { Text("OK") }
                }
            }
        }
    }
}
TimePickers.kt

Note the key points in this snippet:

  1. The AdvancedTimePickerExample composable creates a customizable time picker dialog.
  2. It uses a Dialog composable for more flexibility than AlertDialog.
  3. The dialog includes a customizable title and a toggle button to switch between dial and input modes.
  4. Surface applies shape and elevation to the dialog, with IntrinsicSize.Min for both width and height.
  5. Column and Row layout provide the dialog's structure components.
  6. The example tracks the picker mode using showDial.
    • An IconButton toggles between modes, updating the icon accordingly.
    • The dialog content switches between TimePicker and TimeInput based on the showDial state.

This advanced implementation provides a highly customizable and reusable time picker dialog that can adapt to different use cases in your app.

This implementation appears as follows:

A time picker in a custom dialog that implements a title, a mode toggle, and dismiss and confirm buttons.
Figure 2. A time picker in a custom dialog.

Additional resources