Не могу заставить Android Jetpack Compose BackHandler работать ⇐ Android

[Anonymous]

Я пытаюсь использовать BackHandler Android Jetpack Compose для перехвата обработки кнопки «Назад», используя следующий сокращенный код:

Код: Выделить всё

package com.example.backhandlertest

import androidx.activity.compose.BackHandler
import androidx.annotation.StringRes
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowBack
import androidx.compose.material3.Button
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.TopAppBar
import androidx.compose.material3.TopAppBarDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.navigation.NavHostController
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.compose.rememberNavController

@Composable
fun BackHandlerTestApp(
navController: NavHostController = rememberNavController()
) {
val backStackEntry by navController.currentBackStackEntryAsState()
val route = backStackEntry?.destination?.route
val currentScreenTitle = if (route != null) {
stringResource(BackHandlerTestScreen.valueOf(route).title)
} else {
"*"
}
val canNavigateBack = navController.previousBackStackEntry != null

Scaffold(
topBar = {
BackHandlerTestAppBar(
title = currentScreenTitle,
canNavigateBack = canNavigateBack,
navigateUp = {
navController.navigateUp()
}
)
}
) { innerPadding ->
NavHost(
navController = navController,
startDestination = BackHandlerTestScreen.Home.name,
modifier = Modifier.padding(innerPadding)
) {
composable(route = BackHandlerTestScreen.Home.name) {
HomeScreen(
onClick = {
navController.navigate(BackHandlerTestScreen.BackButtonClickCounter.name)
}
)
}
composable(route = BackHandlerTestScreen.BackButtonClickCounter.name) {
BackButtonClickCounterScreen()
}
}
}
}

enum class BackHandlerTestScreen(@StringRes val title: Int) {
Home(title = R.string.app_name),
BackButtonClickCounter(title = R.string.back_button_click_counter_title),
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun BackHandlerTestAppBar(
title: String,
canNavigateBack: Boolean,
navigateUp: () -> Unit,
modifier: Modifier = Modifier
) {
TopAppBar(
title = {
Text(title)
},
colors = TopAppBarDefaults.mediumTopAppBarColors(
containerColor = MaterialTheme.colorScheme.primaryContainer
),
modifier = modifier,
navigationIcon = {
if (canNavigateBack) {
IconButton(onClick = navigateUp) {
Icon(
imageVector = Icons.Filled.ArrowBack,
contentDescription = stringResource(R.string.back_button)
)
}
}
}
)
}

@Composable
fun HomeScreen(
onClick: () ->  Unit,
) {
Surface(modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
Column(
modifier = Modifier.fillMaxSize(),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
Text(stringResource(id = R.string.app_name))
Button(onClick = { onClick() }) {
Text(text = stringResource(id = R.string.back_click_counter))
}
}

}
}

@Composable
fun BackButtonClickCounterScreen() {
var backButtonClickCounter by remember { mutableIntStateOf(0) }

BackHandler {
backButtonClickCounter++
}

Surface(modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background) {
Column(
modifier = Modifier.fillMaxSize(),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
Text(text = stringResource(id = R.string.back_clicks_counted))
Text(text = backButtonClickCounter.toString())
}
}
}

Я использую Android 9 (уровень API 28) (это самый низкий уровень API, который нам нужно поддерживать, но я также пробовал уровень API 33 в эмуляторе), и кажется, что мой BackHandler никогда не вызывается. Я делаю что-то не так или нашел ошибку в Jetpack Compose?
С уважением,
Ларс
P.S.: Я знаю, что Jetpack Compose BackHandler не запускается на моем телефоне Android 9

Подробнее здесь: https://stackoverflow.com/questions/784 ... er-to-work