Навигация Jetpack Compose: виды исчезают при переключении пунктов назначения ⇐ Android

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У меня возникла проблема с навигацией Jetpack Compose с использованием NavHost и RememberNavController. Большую часть времени мое приложение работает должным образом, но иногда, когда я нажимаю кнопки для переключения между экранами, содержимое исчезает, и видимой остается только поверхность.


Вот упрощенная версия моего кода:

Код: Выделить всё

class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
val navController = rememberNavController()
NavigationTestTheme {
Surface(
modifier = Modifier.fillMaxSize(),
color = Color.Cyan
) {
NavHost(navController = navController, startDestination = "First") {
composable(route = "First") {
FirstScreen(onButtonTap = { navController.navigate("Second") })
}
composable(route = "Second") {
SecondScreen(onButtonTap = { navController.popBackStack() })
}
}
}
}
}
}
}

@Composable
fun FirstScreen(onButtonTap: () -> Unit) {
Box(
contentAlignment = Alignment.Center,
modifier = Modifier
.fillMaxSize()
.background(Color.Blue)
) {
CustomButton(title = "To Second View") {
onButtonTap()
}
}
}

@Composable
fun SecondScreen(onButtonTap: () -> Unit) {
Box(
contentAlignment = Alignment.Center,
modifier = Modifier
.fillMaxSize()
.background(Color.Green)
) {
CustomButton(title = "Pop View") {
onButtonTap()
}
}
}

@Composable
fun CustomButton(title: String, onClick: () -> Unit) {
Button(
onClick = { onClick() },
modifier = Modifier.size(width = 200.dp, height = 40.dp)
) {
Text(text = title)
}
}

The expected behavior is:

• Display the FirstScreen on the initial launch.
• Navigate to the SecondScreen and add it to the back stack when the button in the FirstScreen is tapped.
• Pop the SecondScreen when the button in the SecondScreen is tapped, and display the FirstScreen again.

However, sometimes when I tap buttons on both FirstScreen and SecondScreen to switch views, the views get removed from the back stack, and only the Surface with the Cyan color remains visible.

I've tried simplifying the code and isolating the issue, but I can't seem to pinpoint the root cause. Any suggestions or insights into what might be causing this issue would be greatly appreciated.
Thank you in advance for your help!


Источник: https://stackoverflow.com/questions/781 ... stinations