Capitalize AM/PM in Material 3 Jetpack Compose TimePicker

Question

How to capitalize the AM/PM in Jetpack Compose M3 TimePicker?

Missed to add earlier - Works in my emulator, the issue is device-specific (depends on Locale).

In the emulator, the AM/PM appears in capital letters, but in a physical device the letters appear in small letters

Code is directly copied from Android Docs for TimePicker and Android Source code for TimePickerDialog,

Physical Device specs, Model - Redmi 8 Android OS - 10 MIUI 12.5.2

Emulator Pixel 2 API 31

I raised this issue in Google Tracker,
https://issuetracker.google.com/issues/295761434.
https://issuetracker.google.com/issues/295971939

But, on the same device, the Google Clock app has caps AM/PM.

Answer 1

This is my code which is working fine. You can try this one.

Preview

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.IntrinsicSize
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.material3.Button
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.SnackbarHost
import androidx.compose.material3.SnackbarHostState
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.TimePicker
import androidx.compose.material3.rememberTimePickerState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Dialog
import androidx.compose.ui.window.DialogProperties
import kotlinx.coroutines.launch
import java.text.SimpleDateFormat
import java.util.Calendar
import java.util.Locale


@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun Ex10() {

    var showTimePicker by remember { mutableStateOf(false) }
    val state = rememberTimePickerState()
    val formatter = remember { SimpleDateFormat("hh:mm a", Locale.getDefault()) }
    val snackState = remember { SnackbarHostState() }
    val snackScope = rememberCoroutineScope()

    Box(propagateMinConstraints = false) {
        Button(
            modifier = Modifier.align(Alignment.Center),
            onClick = { showTimePicker = true }
        ) {
            Text("Set Time")
        }
        SnackbarHost(hostState = snackState)
    }

    if (showTimePicker) {
        TimePickerDialog(
            onCancel = { showTimePicker = false },
            onConfirm = {
                val cal = Calendar.getInstance()
                cal.set(Calendar.HOUR_OF_DAY, state.hour)
                cal.set(Calendar.MINUTE, state.minute)
                cal.isLenient = false
                snackScope.launch {
                    snackState.showSnackbar("Entered time: ${formatter.format(cal.time)}")
                }
                showTimePicker = false
            },
        ) {
            TimePicker(state = state)
        }
    }
}


@Composable
fun TimePickerDialog(
    title: String = "Select Time",
    onCancel: () -> Unit,
    onConfirm: () -> Unit,
    toggle: @Composable () -> Unit = {},
    content: @Composable () -> Unit,
) {
    Dialog(
        onDismissRequest = onCancel,
        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
                ),
        ) {
            toggle()
            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()
                ) {
                    Spacer(modifier = Modifier.weight(1f))
                    TextButton(
                        onClick = onCancel
                    ) { Text("Cancel") }
                    TextButton(
                        onClick = onConfirm
                    ) { Text("OK") }
                }
            }
        }
    }
}