在 Material 3 Jetpack Compose TimePicker 中大写 AM/PM

Question

如何在 Jetpack Compose M3 TimePicker 中大写 AM/PM？

我在 Google Tracker 中提出了这个问题，
https://issuetracker.google.com/issues/295761434。
https://issuetracker.google.com/issues/295971939

但是，在同一设备上，Google 时钟应用程序具有 AM/PM 上限。

Answer 1

这是我的代码，运行良好。你可以试试这个。

预览

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") }
                }
            }
        }
    }
}