Помните, что Unblable Orror -ошибка AndavController Android ⇐ Android

[Anonymous]

С кодом ниже я получаю ошибку с MampleNavController () . Импорт и ссылки на MomplyNavController () являются красными, но я не уверен, что это за ошибка. Я поместил комментарии, где есть ошибки. Ниже приведен код: < /p>
package com.example.appname
/*
* Copyright 2025 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.example.compose.snippets.components

import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material.icons.Icons
//import androidx.compose.material.icons.filled.Album
//import androidx.compose.material.icons.filled.MusicNote
//import androidx.compose.material.icons.filled.PlaylistAddCircle
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.NavigationBar
import androidx.compose.material3.NavigationBarDefaults
import androidx.compose.material3.NavigationBarItem
import androidx.compose.material3.NavigationRail
import androidx.compose.material3.NavigationRailItem
import androidx.compose.material3.PrimaryTabRow
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Tab
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.tooling.preview.Preview
import androidx.navigation.NavHostController
import androidx.navigation.compose.NavHost // error
import androidx.navigation.compose.composable // error
import androidx.navigation.compose.rememberNavController // error

@Composable
fun SongsScreen(modifier: Modifier = Modifier) {
Box(
modifier = Modifier.fillMaxSize(),
contentAlignment = Alignment.Center
) {
Text("Songs Screen")
}
}

@Composable
fun AlbumScreen(modifier: Modifier = Modifier) {
Box(
modifier = Modifier.fillMaxSize(),
contentAlignment = Alignment.Center
) {
Text("Album Screen")
}
}

@Composable
fun PlaylistScreen(modifier: Modifier = Modifier) {
Box(
modifier = Modifier.fillMaxSize(),
contentAlignment = Alignment.Center
) {
Text("Playlist Screen")
}
}

enum class Destination(
val route: String,
val label: String,
val icon: ImageVector,
val contentDescription: String
) {
SONGS("songs", "Songs", Icons.Default.MusicNote, "Songs"),
ALBUM("album", "Album", Icons.Default.Album, "Album"),
PLAYLISTS("playlist", "Playlist", Icons.Default.PlaylistAddCircle, "Playlist")
}

@Composable
fun AppNavHost(
navController: NavHostController,
startDestination: Destination,
modifier: Modifier = Modifier
) {
NavHost( // error
navController,
startDestination = startDestination.route
) {
Destination.entries.forEach { destination ->
composable(destination.route) { // error
when (destination) {
Destination.SONGS -> SongsScreen()
Destination.ALBUM -> AlbumScreen()
Destination.PLAYLISTS -> PlaylistScreen()
}
}
}
}
}

@Preview()
// [START android_compose_components_navigationbarexample]
@Composable
fun NavigationBarExample(modifier: Modifier = Modifier) {
val navController = rememberNavController() // error
val startDestination = Destination.SONGS
var selectedDestination by rememberSaveable { mutableIntStateOf(startDestination.ordinal) }

Scaffold(
modifier = modifier,
bottomBar = {
NavigationBar(windowInsets = NavigationBarDefaults.windowInsets) {
Destination.entries.forEachIndexed { index, destination ->
NavigationBarItem(
selected = selectedDestination == index,
onClick = {
navController.navigate(route = destination.route)
selectedDestination = index
},
icon = {
Icon(
destination.icon,
contentDescription = destination.contentDescription
)
},
label = { Text(destination.label) }
)
}
}
}
) { contentPadding ->
AppNavHost(navController, startDestination, modifier = Modifier.padding(contentPadding))
}
}
// [END android_compose_components_navigationbarexample]

@Preview()
// [START android_compose_components_navigationrailexample]
@Composable
fun NavigationRailExample(modifier: Modifier = Modifier) {
val navController = rememberNavController() // error
val startDestination = Destination.SONGS
var selectedDestination by rememberSaveable { mutableIntStateOf(startDestination.ordinal) }

Scaffold(modifier = modifier) { contentPadding ->
NavigationRail(modifier = Modifier.padding(contentPadding)) {
Destination.entries.forEachIndexed { index, destination ->
NavigationRailItem(
selected = selectedDestination == index,
onClick = {
navController.navigate(route = destination.route)
selectedDestination = index
},
icon = {
Icon(
destination.icon,
contentDescription = destination.contentDescription
)
},
label = { Text(destination.label) }
)
}
}
AppNavHost(navController, startDestination)
}
}
// [END android_compose_components_navigationrailexample]

@OptIn(ExperimentalMaterial3Api::class)
@Preview(showBackground = true)
// [START android_compose_components_navigationtabexample]
@Composable
fun NavigationTabExample(modifier: Modifier = Modifier) {
val navController = rememberNavController() // error
val startDestination = Destination.SONGS
var selectedDestination by rememberSaveable { mutableIntStateOf(startDestination.ordinal) }

Scaffold(modifier = modifier) { contentPadding ->
PrimaryTabRow(selectedTabIndex = selectedDestination, modifier = Modifier.padding(contentPadding)) {
Destination.entries.forEachIndexed { index, destination ->
Tab(
selected = selectedDestination == index,
onClick = {
navController.navigate(route = destination.route)
selectedDestination = index
},
text = {
Text(
text = destination.label,
maxLines = 2,
overflow = TextOverflow.Ellipsis
)
}
)
}
}
AppNavHost(navController, startDestination)
}
}
// [END android_compose_components_navigationtabexample]


Подробнее здесь: https://stackoverflow.com/questions/796 ... or-android